NSFOCUS SA2003-04 : Remote Buffer Overflow Vulnerability in Web Management Interface of Cisco Secure ACS

From: NSFOCUS Security Team (security@nsfocus.com)
Date: 04/24/03

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    From: NSFOCUS Security Team <security@nsfocus.com>
    To: bugtraq@securityfocus.com
    Date: Thu, 24 Apr 2003 12:02:43 +0800
    
    

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    NSFOCUS Security Advisory(SA2003-04)

    Topic: Remote Buffer Overflow Vulnerability in Web Management Interface of
           Cisco Secure ACS

    Release Date: 2003-04-24

    CVE CAN ID: CAN-2003-0210

    Affected system:
    ===================

    Cisco Secure ACS 2.6.4 for Windows and earlier
    Cisco Secure ACS 3.0.3 for Windows and earlier
    Cisco Secure ACS 3.1.1 for Windows and earlier

    Summary:
    =========

    NSFOCUS Security Team has found a security vulnerability during the WEB
    management interface of Cisco Secure ACS handling certain parameters. Exploiting
    the vulnerability attackers could cause the service to hang or run arbitrary
    code.

    Description:
    ============

    Cisco Secure Access Control Server(ACS) is a high-performance, highly scalable,
    centralized user access control framework. It supports centralized access and
    audit for dial access server, VPN and firewall, and IP voice(VoIP) solutions,
    as well as user based on standard IEEE 802.1x for wireless users of Cisco
    Aironet 350 wireless integration solution.

    The management of Cisco Secure ACS is implemented via WEB interface. Cisco
    Secure ACS will install a service known as "CSAdmin"( the corresponding program
    of which is CSAdmin.exe) on the system. Once the service is enabled it listens
    on TCP/2002 port and accepts HTTP request.

    A buffer overflow vulnerability occurs during CSAdmin.exe handling login.exe
    request. Receiving the login request CSAdmin.exe will call wsprintfA to handle
    the user parameter without any length check on the parameter. If attackers
    send an extremely long user parameter to the server, they might cause a buffer
    overflow, resulting in service hanging or restarting. With carefully
    crafted data attacker could run arbitrary code with CSAdmin process
    privilege(typically LocalSystem) on the server.

    Workaround:
    ===========

    Block access to the port TCP/2002 of the host running Cisco Secure ACS from
    untrusted IPs on the firewall.

    Vendor Status:
    ==============

    2003-03-16 Informed the vendor.
    2003-03-23 The vendor confirmed the vulnerability.
    2003-04-23 The vendor released an advisory and patches for this issue.

    Cisco Bug ID: CSCea51366

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

    The patches:

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

    Fixes to the CSAdmin will be included in ACS for windows versions 2.6.5,
    3.0.4 and 3.1.2, and later.

    Additional Information:
    ========================

    The Common Vulnerabilities and Exposures (CVE) project has assigned the
    name CAN-2003-0210 to this issue. This is a candidate for inclusion in the
    CVE list (http://cve.mitre.org), which standardizes names for security
    problems. Candidates may change significantly before they become official
    CVE entries.

    Credit:
    =========

    This vulnerability was discovered by Yang Yu of NSFOCUS Security Team.

    DISCLAIMS:
    ==========
    THE INFORMATION PROVIDED IS RELEASED BY NSFOCUS "AS IS" WITHOUT WARRANTY
    OF ANY KIND. NSFOCUS DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED,
    EXCEPT FOR THE WARRANTIES OF MERCHANTABILITY. IN NO EVENTSHALL NSFOCUS
    BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT,
    INCIDENTAL,CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES,
    EVEN IF NSFOCUS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
    DISTRIBUTION OR REPRODUCTION OF THE INFORMATION IS PROVIDED THAT THE
    ADVISORY IS NOT MODIFIED IN ANY WAY.

    Copyright 1999-2003 NSFOCUS. All Rights Reserved. Terms of use.

    NSFOCUS Security Team <security@nsfocus.com>
    NSFOCUS INFORMATION TECHNOLOGY CO.,LTD
    (http://www.nsfocus.com)

    PGP Key: http://www.nsfocus.com/homepage/research/pgpkey.asc
    Key fingerprint = F8F2 F5D1 EF74 E08C 02FE 1B90 D7BF 7877 C6A6 F6DA

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