[cisco-ttl] Cisco Security Advisory: Cisco Secure Access Control Server for Windows Admin Buffer Overflow Vulnerability (fwd)

From: Ilker Temir ([email protected])
Date: Wed Apr 23 2003 - 15:39:47 GMT

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    Cisco Security Advisory: Cisco Secure Access Control Server for
    Windows Admin Buffer Overflow Vulnerability
    =======================================================================

    Revision 1.0

    For Public Release 2003 April 23 08:00 (GMT)

    - ------------------------------------------------------------------------

    Summary
    =======

    Cisco Secure ACS for Windows is vulnerable to a buffer overflow on the
    administration service which runs on TCP port 2002. Exploitation of this
    vulnerability results in a Denial of Service, and can potentially result
    in system administrator access. Cisco is providing repaired software,
    and customers are recommended to install patches or upgrade at their
    earliest opportunity. Workarounds can be implemented, and consist of
    blocking external access to port 2002 on the ACS.

    This issue is documented in Cisco Bug ID CSCea51366. This issue is also
    being referenced in the Mitre CVE as CAN-2003-0210.

    This advisory is available at
    http://www.cisco.com/warp/public/707/cisco-sa-20030423-ACS.shtml.

    Affected Products
    =================

    Cisco Secure ACS versions up to and including version 2.6.4 , 3.0.3, and
    3.1.1 are affected by this vulnerability.

    No other Cisco products are affected by this vulnerability.
    Specifically, Cisco Secure ACS for UNIX is NOT affected by this
    vulnerability.

    Details
    =======

    Cisco Secure ACS for Windows provides a Web-based management interface,
    termed CSAdmin, which listens on TCP port 2002. A buffer overflow
    vulnerability occurs during CSAdmin process servicing login requests.
    Once a sufficiently long user parameter is received by the server, this
    can cause the buffer overflow, which would typically result in the
    service hanging until it can be restarted. It is possible that a buffer
    overflow could be performed that would result in the compromise of the
    system and permit remote control of the system.

    This issue is resolved by applying the patch files to repair the CSAdmin
    program, and will be repaired in future versions of CSAdmin.

    Bug ID
    CSCea51366

    Impact
    ======

    Customer installations of Cisco Secure ACS for Windows that provide
    unrestricted access to all ports on the server may be vulnerable to a
    Denial of Service, or potentially a root compromise. It is recommended
    that customers upgrade to repaired versions of Cisco Secure ACS, or
    install Cisco Secure ACS such that external access to management
    interfaces is eliminated or severely restricted.

    Software Versions and Fixes
    ===========================

    Fixes to the CSAdmin will be included in ACS for Windows versions 3.0.4,
    3.1.2, and later, which will become available on the Cisco website.
    Patch files for 2.6.4, 3.0.3, and 3.1.1 are currently available on the
    Cisco website. Customers running versions earlier than 2.6.4, 3.0.3, or
    3.1.1 will need to upgrade to those versions to apply the patch files.

    The patch files that resolve this problem for specific versions are as
    follows:

        * ACS 3.1(1) - CSAdmin-Patch-3.1-1-27.zip
        * ACS 3.0(3) - CSAdmin-Patch-3.0-3-6.zip
        * ACS 2.6 - CSAdmin-patch-2.6-4-4.zip

    Customers that are logged into the Cisco website can download these
    files at: http://www.cisco.com/cgi-bin/tablebuild.pl/cs-acs-win.

    Obtaining Fixed Software
    ========================

    Cisco is offering free software upgrades to remedy this vulnerability
    for all affected customers. Customers may only install and expect
    support for the feature sets they have purchased.

    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 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 assistance with the upgrade, which
    should be free of charge.

    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 or patch files by contacting the Cisco
    Technical Assistance Center (TAC). In those cases, customers may only
    upgrade to a later version of the same release to which they are
    entitled, or the patch files for that release. TAC contacts are as follows:

        * +1 800 553 2447 (toll-free from within North America)
        * +1 408 526 7209 (toll call from anywhere in the world)
        * email: [email protected] <mailto:[email protected]>.

    See 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.

    Please have your product serial number available and give the URL
    <http://www.cisco.com/warp/public/707/cisco-sa-20030423-ACS.shtml> of
    this notice as evidence of your entitlement to a free upgrade. Free
    upgrades for non-contract customers must be requested through the TAC.

    Please do not contact either "[email protected]" or
    "[email protected]" for software upgrades

    Workarounds
    ===========

    It is recommended that customers patch systems, or upgrade to repaired
    versions of Cisco Secure ACS. Alternatively, the vulnerability can be
    mitigated by blocking access to the ACS on port 2002, as well as
    strictly limiting the access to internal hosts that have reason to
    connect to the ACS. This can be accomplished with access control lists
    on routers or firewalls.

    Exploitation and Public Announcements
    =====================================

    The Cisco PSIRT was made aware of this vulnerability by the NSFOCUS
    Security Team, who are also releasing an advisory regarding this issue.
    Their advisory will be available at
    http://www.nsfocus.com/english/homepage/sa2003-04.htm.

    Cisco is unaware of malicious use of the vulnerabilities described in
    this advisory.

    Status of This Notice: Final
    ============================

    This is a final notice. Although Cisco cannot guarantee the accuracy of
    all statements in this notice, all the facts have been checked to the
    best of our ability. Cisco does not anticipate issuing updated versions
    of this notice unless there is some material change in the facts. Should
    there be a significant change in the facts, Cisco may update this notice.

    Distribution
    ============

    This notice will be posted on Cisco's worldwide website at
    http://www.cisco.com/warp/public/707/cisco-sa-20030423-ACS.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:

        * [email protected]
        * [email protected]
        * [email protected]
        * [email protected] (includes CERT/CC)
        * [email protected]
        * [email protected]
        * comp.dcom.sys.cisco
        * Various internal Cisco mailing lists

    Future updates of this notice, if any, will be placed on Cisco's
    worldwide web. Users concerned about this problem are encouraged to
    check the URL given above for any updates.

    Revision History
    ================

    Revision 1.0 2003-April-23 Initial 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/warp/public/707/sec_incident_response.shtml. This
    includes instructions for press inquiries regarding Cisco security
    notices. All Cisco Security Advisories are available at
    http://www.cisco.com/go/psirt.

    - ------------------------------------------------------------------------

    This notice is Copyright 2003 by Cisco Systems, Inc. This notice may be
    redistributed freely after the release date given at the top of the
    text, provided that redistributed copies are complete and unmodified,
    and include all date and version information.

    - ------------------------------------------------------------------------

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