[cisco-ttl] Cisco Security Advisory: Cisco IOS Virtual Private Dial-up Network Denial of Service Vulnerability

From: Cisco Systems Product Security Incident Response Team <psirt_at_....>
Date: Wed, 26 Mar 2008 17:00:00 +0100


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Cisco Security Advisory: Cisco IOS Virtual Private Dial-up Network

                         Denial of Service Vulnerability

Advisory ID: cisco-sa-20080326-pptp

http://www.cisco.com/warp/public/707/cisco-sa-20080326-pptp.shtml

Revision 1.0

For Public Release 2008 March 26 1600 UTC (GMT)

Summary


Two vulnerabilities exist in the virtual private dial-up network (VPDN) solution when Point-to-Point Tunneling Protocol (PPTP) is used in certain Cisco IOS releases prior to 12.3. PPTP is only one of the supported tunneling protocols used to tunnel PPP frames within the VPDN solution.

The first vulnerability is a memory leak that occurs as a result of PPTP session termination. The second vulnerability may consume all interface descriptor blocks on the affected device because those devices will not reuse virtual access interfaces. If these vulnerabilities are repeatedly exploited, the memory and/or interface resources of the attacked device may be depleted.

Cisco has made free software available to address these vulnerabilities for affected customers.

There are no workarounds available to mitigate the effects of these vulnerabilities.

This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20080326-pptp.shtml

Note: The March 26, 2008 publication includes five security advisories. The advisories all address vulnerabilities in Cisco's Internetwork Operating System (IOS) software. Each advisory lists the releases that correct the vulnerability described in the advisory, and also lists the releases that correct the vulnerabilities in the other five advisories. Please reference the following software table to find a release that fixes all published software advisories as of March 26th, 2008:

Individual publication links are listed below:

Affected Products


Devices that are running certain Cisco IOS versions prior to 12.3 with VPDN enabled may be affected by these vulnerabilities.

Vulnerable Products

+------------------

Devices that are running affected versions of Cisco IOS with VPDN enabled and are configured to accept termination of PPTP sessions are vulnerable.

To determine whether VPDN is enabled on your device, log in to the device and issue the command-line interface (CLI) command "show running-config". If the output contains "vpdn enable" along with a "vpdn-group <name>" command, VPDN is enabled on the device. The device will accept termination of PPTP sessions if the command "protocol any" or "protocol pptp" is defined under the "vpdn-group <name>" command. The following example shows a device that is running VPDN and will accept termination of PPTP sessions:

    Router#show running-config
    Building configuration...     

    !
    !--- Output truncated.
    !
    

    vpdn enable     

    !     

    vpdn-group test_only
    ! Default PPTP VPDN group

     accept-dialin
      protocol pptp
      virtual-template 1
    

    !
    !---Remaining output truncated.     

To determine the software version running on a Cisco product, log in to the device and issue the "show version" command to display the system banner. Cisco IOS software will identify itself as "Internetwork Operating System Software" or simply "IOS." On the next line of output, the image name will be displayed between parentheses, followed by "Version" and the IOS release name. Other Cisco devices will not have the "show version" command or will give different output.

The following example identifies a Cisco product that is running Cisco IOS release 12.2(7):

    Cisco Internetwork Operating System Software     IOS (tm) 7200 Software (C7200-IS-M), Version 12.2(7), RELEASE SOFTWARE (fc1)     Copyright (c) 1986-2002 by cisco Systems, Inc.     Compiled Tue 15-Jan-02 18:31 by pwade     Image text-base: 0x600089C0, data-base: 0x613A6000

Additional information about Cisco IOS release naming can be found at http://www.cisco.com/warp/public/620/1.html.

Products Confirmed Not Vulnerable

+--------------------------------

Devices that are running Cisco IOS versions 12.3 and later are not affected by these vulnerabilities. Devices that are explicitly configured for VPDN protocols other than PPTP are not affected.

Devices that are running Cisco IOS versions prior to 12.3 and do not have VPDN enabled are not affected by these vulnerabilities.

Cisco IOS XR is not affected by these vulnerabilities.

Details


VPDNs securely carry private data over a public network, allowing remote users to access a private network over a shared infrastructure such as the Internet. VPDNs maintain the same security and management policies as a private network, while providing a cost-effective method for point-to-point connections between remote users and a central network.

PPTP is a network protocol that enables the secure transfer of data from a remote client to a private enterprise server by creating a VPDN across TCP/IP-based data networks. PPTP supports on-demand, multiprotocol, virtual private networking over public networks, such as the Internet.

Details regarding the two known vulnerabilities in Cisco IOS devices that are running affected versions of system software follow:

    Upon completion of a PPTP session, memory is leaked from the     processor memory on the terminating device. This is shown in the     output of "show process memory" under the *Dead* process. The     *Dead* process is not a real process. Its function is to account     for the memory that is allocated under the context of another     process which has terminated, in this case PPTP. When the     administrator is logged into the device, if the device is under     exploitation, the Holding entry of the *Dead* process under the     "show process memory" command will be increasing. Following is     an example showing a device that is holding *Dead* memory:    

        Router#show process memory 
        Total: 199718560, Used: 11147828, Free: 188570732
         PID TTY  Allocated      Freed    Holding    Getbufs    Retbufs Process
           0   0      99812       1848    8415816          0          0 *Init*          
           0   0        444     778840        444          0          0 *Sched*         
           0   0   17481700    4930848     819672     180908          0 *Dead*          
           1   0        284        284       3828          0          0 Load Meter 
        
        !--- Output truncated.
        

    The CLI command "show memory dead" allows administrators to examine     the contents of *Dead*. The output will display many occurrences     of PPTP in the output if the PPTP process is causing the leak.     The following example shows the dead memory for a device that has     been exploited by the vulnerability    

        Router#show memory dead
                        Head    Total(b)     Used(b)     Free(b)   Lowest(b)  Largest(b)
        Processor   6225FF40   224002240    11906736   212095504   212082872   212084464
              I/O   20000000    33554440      994136    32560304    32560304    32560252
            I/O-2    F800000     8388616     1020632     7367984     7367984     7367932
        

                  Processor memory
        
         Address      Bytes     Prev     Next Ref    PrevF   NextF Alloc PC  what
        62275DC8 0000000048 62275D68 62275E24 001  ------- ------- 60654230  PPTP create idb
        62275E24 0000000052 62275DC8 62275E84 001  ------- ------- 60654230  PPTP create idb
        62275E84 0000000052 62275E24 62275EE4 001  ------- ------- 60654230  PPTP create idb
        ....
        
        !--- remaining output truncated.
        

    This vulnerability is documented in Cisco bug ID CSCsj58566     and Common Vulnerabilities and Exposures (CVE) identifier     CVE-2008-1151 has been assigned to this vulnerability.

    Upon completion of a PPTP session, affected devices do not remove     the virtual access interface that is associated with the PPTP     session and do not reuse the interfaces in any future     connections.

    This situation can result in an exhaustion of the interface     descriptor block (IDB) limit, which will prevent any new     interfaces being created within Cisco IOS, effectively blocking     all new VPDN connections, even though the router may still have     enough processor memory to remain up and running. A reload of the     device is required to remove the interfaces.

    An IDB is a Cisco IOS internal data structure that contains     information such as the IP address, interface state, and packet     statistics. Cisco IOS software maintains one IDB for each     interface present on a platform and one IDB for each     subinterface.

    Further documentation on Cisco IOS IDBs can be found at:     http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_tech_note09186a0080094322.shtml     This vulnerability is documented in Cisco bug ID CSCdv59309     and Common Vulnerabilities and Exposures (CVE) identifier     CVE-2008-1150 has been assigned to this vulnerability.

Vulnerability Scoring Details


Cisco is providing scores for the vulnerabilities in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this Security Advisory is done in accordance with CVSS version 2.0.

Cisco will provide a base and temporal score. Customers can then compute environmental scores to assist in determining the impact of the vulnerability in individual networks.

CVSS is a standards based scoring method that conveys vulnerability severity and helps determine urgency and priority of response.

Cisco has provided an FAQ to answer additional questions regarding CVSS at
http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html

Cisco has also provided a CVSS calculator to help compute the environmental impact for individual networks at http://intellishield.cisco.com/security/alertmanager/cvss

CSCsj58566 - Memory Leak due to PPTP Session Termination

  CVSS Base Score - 7.1

  Access Vector:          Network
  Access Complexity:      Medium
  Authentication:         None

  Confidentiality Impact: None
  Integrity Impact:       None

  Availability Impact: Complete

  CVSS Temporal Score - 5.9

  Exploitability:         Functional
  Remediation Level:      Official-Fix
  Report Confidence:      Confirmed

CSCdv59309 - Virtual Access Interfaces Are Not Re-used

  CVSS Base Score - 4.3

  Access Vector:          Network
  Access Complexity:      Medium
  Authentication:         None

  Confidentiality Impact: None
  Integrity Impact:       None

  Availability Impact: Partial

  CVSS Temporal Score - 3.6

  Exploitability:         Functional
  Remediation Level:      Official-Fix
  Report Confidence:      Confirmed

Impact


Successful exploitation of the vulnerability may result in a memory leak of processor memory or consumption of all available IDBs on the device. With continued exploitation, the device will deplete its processor memory or reach an IDB limit. Both impacts would result in a denial of service condition for the device.

Software Versions and Fixes


When considering software upgrades, also consult http://www.cisco.com/go/psirt and any subsequent advisories to determine exposure and a complete upgrade solution.

In all cases, customers should exercise caution to be certain the devices to be upgraded contain sufficient memory and that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, contact the Cisco Technical Assistance Center ("TAC") or your contracted maintenance provider for assistance.

Each row of the Cisco IOS software table (below) names a Cisco IOS release train. If a given release train is vulnerable, then the earliest possible releases that contain the fix (along with the anticipated date of availability for each, if applicable) are listed in the "First Fixed Release" column of the table. The "Recommended Release" column indicates the releases which have fixes for all the published vulnerabilities at the time of this Advisory. A device running a release in the given train that is earlier than the release in a specific column (less than the First Fixed Release) is known to be vulnerable. Cisco recommends upgrading to a release equal to or later than the release in the "Recommended Releases" column of the table.

+----------------------------------------+
|   Major    | Availability of Repaired  |
|  Release   |         Releases          |
|------------+---------------------------|
|  Affected  | First Fixed | Recommended |
| 12.0-Based |   Release   |   Release   |
|  Releases  |             |             |
|------------+-------------+-------------|
| 12.0       | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0DA     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0DB     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0DC     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0S      | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0SC     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0SL     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0SP     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0ST     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0SX     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0SY     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0SZ     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0T      | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0W      | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0WC     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0WT     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0XA     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0XB     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0XC     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0XD     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Releases    |             |
|            | prior to    |             |
|            | 12.0(7)XE2  |             |
|            | are         |             |
| 12.0XE     | vulnerable, |             |
|            | release     |             |
|            | 12.0(7)XE2  |             |
|            | and later   |             |
|            | are not     |             |
|            | vulnerable; |             |
|------------+-------------+-------------|
| 12.0XF     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0XG     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0XH     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0XI     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0XJ     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0XK     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0XL     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0XM     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0XN     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0XQ     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0XR     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0XS     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0XV     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0XW     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|  Affected  | First Fixed | Recommended |
| 12.1-Based |   Release   |   Release   |
|  Releases  |             |             |
|------------+-------------+-------------|
| 12.1       | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.1AA     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.1AX     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Releases    |             |
|            | prior to    |             |
|            | 12.1(22)AY1 |             |
|            | are         |             |
| 12.1AY     | vulnerable, | 12.1(22)    |
|            | release     | EA11        |
|            | 12.1(22)AY1 |             |
|            | and later   |             |
|            | are not     |             |
|            | vulnerable; |             |
|------------+-------------+-------------|
| 12.1AZ     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.1CX     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.1DA     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.1DB     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1DC     | first fixed | 12.4(18a)   |
|            | in 12.2B    |             |
|------------+-------------+-------------|
| 12.1E      | Vulnerable; |             |
|            | contact TAC |             |
|------------+-------------+-------------|
|            | Releases    |             |
|            | prior to    |             |
|            | 12.1(11)EA1 |             |
|            | are         |             |
| 12.1EA     | vulnerable, | 12.1(22)    |
|            | release     | EA11        |
|            | 12.1(11)EA1 |             |
|            | and later   |             |
|            | are not     |             |
|            | vulnerable; |             |
|------------+-------------+-------------|
| 12.1EB     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1EC     | first fixed | 12.3(23)BC1 |
|            | in 12.2BC   |             |
|------------+-------------+-------------|
| 12.1EO     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.1EU     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.1EV     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.1EW     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.1EX     | Vulnerable; |             |
|            | contact TAC |             |
|------------+-------------+-------------|
| 12.1EY     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.1EZ     | Vulnerable; |             |
|            | contact TAC |             |
|------------+-------------+-------------|
| 12.1GA     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.1GB     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1T      | migrate to  | 12.3(26)    |
|            | any release |             |
|            | in 12.3     |             |
|------------+-------------+-------------|
| 12.1XA     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.1XB     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.1XC     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.1XD     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.1XE     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.1XF     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.1XG     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.1XH     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.1XI     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1XJ     | first fixed | 12.3(26)    |
|            | in 12.2T    |             |
|------------+-------------+-------------|
| 12.1XK     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1XL     | first fixed | 12.3(26)    |
|            | in 12.2T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1XM     | first fixed | 12.3(26)    |
|            | in 12.2T    |             |
|------------+-------------+-------------|
| 12.1XN     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.1XO     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1XP     | first fixed | 12.3(26)    |
|            | in 12.2T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1XQ     | first fixed | 12.3(26)    |
|            | in 12.2T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1XR     | first fixed | 12.3(26)    |
|            | in 12.2T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1XS     | migrate to  | 12.3(26)    |
|            | any release |             |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1XT     | first fixed | 12.3(26)    |
|            | in 12.2T    |             |
|------------+-------------+-------------|
| 12.1XU     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1XV     | first fixed | 12.3(26)    |
|            | in 12.2XB   |             |
|------------+-------------+-------------|
| 12.1XW     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.1XX     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1XY     | migrate to  | 12.3(26)    |
|            | any release |             |
|            | in 12.3     |             |
|------------+-------------+-------------|
| 12.1XZ     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1YA     | first fixed | 12.3(26)    |
|            | in 12.2T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1YB     | first fixed | 12.3(26)    |
|            | in 12.2T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1YC     | first fixed | 12.3(26)    |
|            | in 12.2T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1YD     | first fixed | 12.3(26)    |
|            | in 12.2T    |             |
|------------+-------------+-------------|
|            | Releases    |             |
|            | prior to    |             |
|            | 12.1(5)YE6  |             |
|            | are         |             |
|            | vulnerable, |             |
| 12.1YE     | release     | 12.3(26)    |
|            | 12.1(5)YE6  |             |
|            | and later   |             |
|            | are not     |             |
|            | vulnerable; |             |
|            | first fixed |             |
|            | in 12.2T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1YF     | first fixed | 12.3(26)    |
|            | in 12.2T    |             |
|------------+-------------+-------------|
| 12.1YG     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.1YH     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1YI     | first fixed | 12.3(26)    |
|            | in 12.2T    |             |
|------------+-------------+-------------|
| 12.1YJ     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|  Affected  | First Fixed | Recommended |
| 12.2-Based |   Release   |   Release   |
|  Releases  |             |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2       | migrate to  | 12.3(26)    |
|            | any release |             |
|            | in 12.3     |             |
|------------+-------------+-------------|
| 12.2B      | 12.2(4)B5   | 12.4(18a)   |
|------------+-------------+-------------|
|            | 12.2(15)    |             |
|            | BC1e        |             |
|            |             |             |
| 12.2BC     | 12.2(15)    | 12.3(23)BC1 |
|            | BC2d        |             |
|            |             |             |
|            | 12.2(8)BC1  |             |
|------------+-------------+-------------|
|            | 12.2(4)BW1  |             |
| 12.2BW     |             | 12.3(26)    |
|            | 12.2(4)BW1a |             |
|------------+-------------+-------------|
| 12.2BY     | 12.2(8)BY   | 12.4(18a)   |
|------------+-------------+-------------|
| 12.2BZ     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2CX     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2CY     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2CZ     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2DA     | Vulnerable; |             |
|            | contact TAC |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2DD     | first fixed | 12.4(18a)   |
|            | in 12.2B    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2DX     | first fixed | 12.4(18a)   |
|            | in 12.2B    |             |
|------------+-------------+-------------|
| 12.2EU     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2EW     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2EWA    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2EX     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2EY     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2EZ     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2FX     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2FY     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2FZ     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2IXA    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2IXB    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2IXC    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2IXD    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2IXE    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2JA     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2JK     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2MB     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2MC     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Releases    |             |
|            | prior to    |             |
|            | 12.2(18)S   |             |
|            | are         |             |
|            | vulnerable, |             |
|            | release     |             |
| 12.2S      | 12.2(18)S   | 12.2(25)S15 |
|            | and later   |             |
|            | are not     |             |
|            | vulnerable; |             |
|            | migrate to  |             |
|            | any release |             |
|            | in 12.2SRC  |             |
|------------+-------------+-------------|
| 12.2SB     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SBC    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SCA    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SE     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SEA    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SEB    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SEC    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SED    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SEE    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SEF    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SEG    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SG     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SGA    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SL     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SM     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SO     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SRA    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SRB    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SRC    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2SU     | migrate to  | 12.4(18a)   |
|            | any release |             |
|            | in 12.3T    |             |
|------------+-------------+-------------|
| 12.2SV     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SVA    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SVC    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SVD    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SW     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Releases    |             |
|            | prior to    |             |
|            | 12.2(17a)SX |             |
|            | are         |             |
|            | vulnerable, |             |
|            | release     | 12.2(18)    |
| 12.2SX     | 12.2(17a)SX | SXF13       |
|            | and later   |             |
|            | are not     |             |
|            | vulnerable; |             |
|            | migrate to  |             |
|            | any release |             |
|            | in 12.2SXF  |             |
|------------+-------------+-------------|
| 12.2SXA    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SXB    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SXD    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SXE    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SXF    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SXH    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2SY     | migrate to  | 12.2(18)    |
|            | any release | SXF13       |
|            | in 12.2SXB  |             |
|------------+-------------+-------------|
|            |             | 12.2(25)S15 |
|            | Vulnerable; |             |
| 12.2SZ     | migrate to  | 12.2(28)    |
|            | any release | SB12        |
|            | in 12.2SRC  |             |
|            |             | 12.2(33)SRC |
|------------+-------------+-------------|
|            | 12.2(15)T4e |             |
| 12.2T      |             | 12.3(26)    |
|            | 12.2(8)T    |             |
|------------+-------------+-------------|
| 12.2TPC    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2UZ     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XA     | first fixed | 12.3(26)    |
|            | in 12.2T    |             |
|------------+-------------+-------------|
| 12.2XB     | 12.2(2)XB5  | 12.3(26)    |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XC     | migrate to  | 12.4(18a)   |
|            | any release |             |
|            | in 12.3T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XD     | first fixed | 12.3(26)    |
|            | in 12.2T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XE     | first fixed | 12.3(26)    |
|            | in 12.2T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XF     | first fixed | 12.3(23)BC1 |
|            | in 12.2BC   |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XG     | first fixed | 12.3(26)    |
|            | in 12.2T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XH     | first fixed | 12.3(26)    |
|            | in 12.2T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XI     | first fixed | 12.3(26)    |
|            | in 12.2T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XJ     | first fixed | 12.3(26)    |
|            | in 12.2T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XK     | first fixed | 12.3(26)    |
|            | in 12.2T    |             |
|------------+-------------+-------------|
| 12.2XL     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2XM     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2XN     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2XO     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XQ     | first fixed | 12.3(26)    |
|            | in 12.2T    |             |
|------------+-------------+-------------|
| 12.2XR     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XS     | first fixed | 12.3(26)    |
|            | in 12.2T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XT     | first fixed | 12.3(26)    |
|            | in 12.2T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XU     | migrate to  | 12.3(26)    |
|            | any release |             |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XV     | migrate to  | 12.3(26)    |
|            | any release |             |
|            | in 12.3     |             |
|------------+-------------+-------------|
| 12.2XW     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2YA     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2YB     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YC     | first fixed | 12.3(26)    |
|            | in 12.2T    |             |
|------------+-------------+-------------|
| 12.2YD     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            |             | 12.2(25)S15 |
|            | Vulnerable; |             |
| 12.2YE     | migrate to  | 12.2(28)    |
|            | any release | SB12        |
|            | in 12.2SRC  |             |
|            |             | 12.2(33)SRC |
|------------+-------------+-------------|
| 12.2YF     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2YG     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2YH     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2YJ     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2YK     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2YL     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2YM     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2YN     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YO     | migrate to  | 12.2(18)    |
|            | any release | SXF13       |
|            | in 12.2SXB  |             |
|------------+-------------+-------------|
| 12.2YP     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2YQ     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2YR     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2YS     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2YT     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2YU     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2YV     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2YW     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YX     | migrate to  | 12.4(18a)   |
|            | any release |             |
|            | in 12.3T    |             |
|------------+-------------+-------------|
| 12.2YY     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            |             | 12.2(25)S15 |
|            | Vulnerable; |             |
| 12.2YZ     | migrate to  | 12.2(28)    |
|            | any release | SB12        |
|            | in 12.2SRC  |             |
|            |             | 12.2(33)SRC |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2ZA     | migrate to  | 12.2(18)    |
|            | any release | SXF13       |
|            | in 12.2SXB  |             |
|------------+-------------+-------------|
| 12.2ZB     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2ZC     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2ZD     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2ZE     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2ZF     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2ZG     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2ZH     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2ZJ     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2ZL     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2ZP     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2ZU     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2ZY     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|  Affected  | First Fixed | Recommended |
| 12.3-Based |   Release   |   Release   |
|  Releases  |             |             |
|----------------------------------------|
|    There are no affected 12.3 based    |
|                releases                |
|----------------------------------------|
|  Affected  | First Fixed | Recommended |
| 12.4-Based |   Release   |   Release   |
|  Releases  |             |             |
|----------------------------------------|
|    There are no affected 12.4 based    |
|                releases                |
+----------------------------------------+

Workarounds


There are no workarounds for this vulnerability. Cisco recommends upgrading to the fixed version of Cisco IOS.

Obtaining Fixed Software


Cisco will make free software available to address this vulnerability for affected customers. This advisory will be updated as fixed software becomes available. Prior to deploying software, customers should consult their maintenance provider or check the software for feature set compatibility and known issues specific to their environment.

Customers may only install and expect support for the feature sets they have purchased. By installing, downloading, accessing or otherwise using such software upgrades, customers agree to be bound by the terms of Cisco's software license terms found at http://www.cisco.com/public/sw-license-agreement.html or as otherwise set forth at Cisco.com Downloads at http://www.cisco.com/public/sw-center/sw-usingswc.shtml.

Do not contact either "psirt_at_cisco.com" or "security-alert_at_cisco.com" for software upgrades.

Customers with Service Contracts

+-------------------------------

Customers with contracts should obtain upgraded software through their regular update channels. For most customers, this means that upgrades should be obtained through the Software Center on Cisco's worldwide website at http://www.cisco.com.

Customers using Third Party Support Organizations

+------------------------------------------------

Customers whose Cisco products are provided or maintained through prior or existing agreement with third-party support organizations such as Cisco Partners, authorized resellers, or service providers should contact that support organization for guidance and assistance with the appropriate course of action in regards to this advisory.

The effectiveness of any workaround or fix is dependent on specific customer situations such as product mix, network topology, traffic behavior, and organizational mission. Due to the variety of affected products and releases, customers should consult with their service provider or support organization to ensure any applied workaround or fix is the most appropriate for use in the intended network before it is deployed.

Customers without Service Contracts

+----------------------------------

Customers who purchase direct from Cisco but who do not hold a Cisco service contract and customers who purchase through third-party vendors but are unsuccessful at obtaining fixed software through their point of sale should get their upgrades by contacting the Cisco Technical Assistance Center (TAC). TAC contacts are as follows.

Have your product serial number available and give the URL of this notice as evidence of your entitlement to a free upgrade. Free upgrades for non-contract customers must be requested through the TAC. Refer to http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml for additional TAC contact information, including special localized telephone numbers and instructions and e-mail addresses for use in various languages.

Exploitation and Public Announcements


The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability described in this advisory.

We would like to thank Martin Kluge of Elxsi Security for reporting these vulnerabilities to us. We greatly appreciate the opportunity to work with researchers on security vulnerabilities, and welcome the opportunity to review and assist with security vulnerability reports against Cisco products.

Status of this Notice: FINAL


THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME. A stand-alone copy or Paraphrase of the text of this document that omits the distribution URL in the following section is an uncontrolled copy, and may lack important information or contain factual errors.

Distribution


This advisory is posted on Cisco's worldwide website at :

http://www.cisco.com/warp/public/707/cisco-sa-20080206-pptp.shtml

In addition to worldwide web posting, a text version of this notice is clear-signed with the Cisco PSIRT PGP key and is posted to the following e-mail and Usenet news recipients.

Future updates of this advisory, if any, will be placed on Cisco's worldwide website, but may or may not be actively announced on mailing lists or newsgroups. Users concerned about this problem are encouraged to check the above URL for any updates.

Revision History


+---------------------------------------+
| Revision |               | Initial    |
| 1.0      | 2008-March-26 | public     |
|          |               | release    |
+---------------------------------------+

Cisco Security Procedures


Complete information on reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco, is available on Cisco's worldwide website at
http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html This includes instructions for press inquiries regarding Cisco security notices. All Cisco security advisories are available at http://www.cisco.com/go/psirt.
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