Cisco Security Advisory: Cisco CallManager Memory Handling Vulnerabilities

From: Cisco Systems Product Security Incident Response Team (
Date: 07/12/05

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    Date: Tue, 12 Jul 2005 08:00:00 -0800 

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    Cisco Security Advisory: Cisco CallManager Memory Handling Vulnerabilities

    Revision 1.0

    For Public Release 2005 July 12 1500 UTC (GMT)



        * Summary
        * Affected Products
        * Details
        * Impact
        * Software Versions and Fixes
        * Obtaining Fixed Software
        * Workarounds
        * Exploitation and Public Announcements
        * Status of This Notice: FINAL
        * Distribution
        * Revision History
        * Cisco Security Procedures


    Cisco CallManager (CCM) is the software-based call-processing component
    of the Cisco IP telephony solution which extends enterprise telephony
    features and functions to packet telephony network devices such as IP
    phones, media processing devices, voice-over-IP (VoIP) gateways, and
    multimedia applications. Cisco CallManager 3.3 and earlier, 4.0, and 4.1
    are vulnerable to Denial of Service (DoS) attacks, memory leaks, and
    memory corruption which may result in services being interrupted,
    servers rebooting, or arbitrary code being executed.

    Cisco has made free software available to address these vulnerabilities.

    This advisory will be posted at

    Affected Products

    Vulnerable Products
    - -----------------
        * Cisco CallManager 3.2 and earlier
        * Cisco CallManager 3.3, versions earlier than 3.3(5)
        * Cisco CallManager 4.0, versions earlier than 4.0(2a)SR2b
        * Cisco CallManager 4.1, versions earlier than 4.1(3)SR1

    Products Confirmed Not Vulnerable
    - -------------------------------
    No other Cisco products are currently known to be affected by these

        * CSCed37403 -- Resource leak with RISDC -- CallManager does
          not time out RISDC (Realtime Information Server Data Collection)
          sockets aggressively enough, leading to a scenario where
          TaskManager indicates that RisDC.exe is using large amounts of
          non-paged pool memory and ports remain in the Close_Wait state.
          Non-paged pool memory allocation can be checked by opening
          Microsoft Windows Task Manager, going to the View menu, choosing
          Select Columns and selecting Non-paged Pool. Open ports are listed
          in the output of the netstat -an command.
        * CSCee00116 -- Cisco CallManager CTI Manager may restart
          with greater than 1GB memory used -- Repeated attacks with crafted
          packets can cause the CTI Manager to allocate greater than 1
          gigabyte of virtual memory. Memory allocation of the ctimgr.exe
          process can be checked by viewing the Microsoft Windows Task Manager.
        * CSCee00118 -- CallManager may restart with repeated attacks
          -- Crafted packets can cause the CallManager to inappropriately
          allocate 500MB to the ccm.exe process, which will return to the
          memory pool under normal conditions. Repeated attacks may cause a
          CallManager under load to exhaust memory resources and restart.
          Memory allocation of the ccm.exe process can be checked by viewing
          the Microsoft Windows Task Manager. Under attack, ccm.exe memory
          will jump repeatedly by 500MB.
        * CSCef47060 -- Failed logins create memory leak when MLA
          enabled -- When MLA (Multi Level Admin) is enabled and there are
          repeated, failed logons for the AST (Admin Service Tool) a memory
          leak may occur. While under normal operations inetinfo.exe will
          use between 20Mb and 30Mb of memory, systems facing this issue
          showed up to 750Mb of memory used. Memory allocation of the
          inetinfo.exe process can be checked by viewing the Microsoft
          Windows Task Manager. MLA is not on by default and the enable
          status can be checked under CCM/User/Access Rights/MLA
          Parameters/Enable Multi Level Admin.
        * CSCsa75554 -- Vulnerability to DoS and remote execution in
          aupair service -- Crafted packets directed at Cisco CallManager
          may cause a memory allocation failure and buffer overflow
          resulting in potential execution of arbitrary code, abnormal
          termination of the aupair process, or corruption of memory. The
          aupair.exe process is a database layer between ccm.exe and SQL
          which cannot be disabled for normal Cisco CallManager operation.
          When viewing Microsoft Windows Task Manager, the process is
          aupair.exe, but under the Service Control Manager it is called
          Cisco Database Layer Monitor. If the aupair.exe process
          terminates, a message will be logged to the events monitor and a
          drwatson report will be generated.

    Successful exploitation of the vulnerabilities may result in severe
    issues with Cisco CallManager and related IP telephony services.
    Triggering a memory allocation and buffer overflow may allow remote code
    execution and breach of confidentiality. Excess memory allocation can
    cause resource starvation resulting in high CPU utilization,
    unresponsive terminal services, the inability to run CCM Admin, or map
    drives. This may then lead to phones not responding, phones
    unregistering from the Cisco CallManager, or Cisco CallManager restarting.

    Software Versions and Fixes
    When considering software upgrades, please also consult
    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") for assistance.

    Each row of the Cisco CallManager software table (below) describes a
    release train which will address all of the vulnerabilities mentioned in
    this advisory. If a given release train is vulnerable, then the earliest
    possible releases that contain the fixes (the "First Fixed Release") and
    the anticipated date of availability for each are listed in the
    "Engineering Special," "Service Release," and "Maintenance Release"
    columns. A device running a Cisco CallManager release in the given train
    that is earlier than the release in a specific column (less than the
    First Fixed Release listed in the Engineering Special or Special Release
    columns) is known to be vulnerable to one or more issues. The Cisco
    CallManager should be upgraded at least to the indicated release or a
    later version (greater than or equal to the First Fixed Release label).

    | Train | Engineering | Service Release | Maintenance Release |
    | | Special | | |
    | 3.2 and | | | migrate to 3.3 or |
    | earlier | | | later |
    | 3.3 | 3.3(3)ES61 3.3 | | 3.3(5) |
    | | (4)ES25 | | |
    | 4.0 | 4.0(2a)ES40 | 4.0(2a)SR2b | no release planned, |
    | | | | migrate to 4.1 |
    | | 4.1(2)ES33 4.1 | | 4.1(4) -- release |
    | 4.1 | (3)ES07 | 4.1(3)SR1 | date to be |
    | | | | determined |

    Obtaining Fixed Software

    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 <>.

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

    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.

        * +1 800 553 2447 (toll free from within North America)
        * +1 408 526 7209 (toll call from anywhere in the world)
        * e-mail: <>

    Please 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.

    Please do not contact either "" or
    "" for software upgrades.

    If you need assistance with the implementation of the workarounds, or
    have questions on the workarounds, please contact the Cisco Technical
    Assistance Center (TAC).

        * +1 800 553 2447 (toll free from within North America)
        * +1 408 526 7209 (toll call from anywhere in the world)
        * e-mail: <>

    See for
    additional TAC contact information, including special localized
    telephone numbers and instructions and e-mail addresses for use in
    various languages.

    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, or as otherwise
    set forth at Downloads at

    There are no workarounds for these vulnerabilities. Cisco CallManager
    security best practices may lessen the risk or mitigate the effects of
    these vulnerabilities. Please refer to the SAFE: IP Telephony Security
    in Depth White Paper located off the SAFE Blueprint introduction page.

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

    The aupair service vulnerability (CSCsa75554) was reported to Cisco by
    Internet Security Systems who will also be making public announcements
    regarding this issue.

    Jeff Fay from PatchAdvisor will issue a report on his findings of
    CSCee00116 on their vulnerability alert service.

    Status of This Notice: FINAL

    A stand-alone copy or paraphrase of the text of this security advisory
    that omits the distribution URL in the following section is an
    uncontrolled copy, and may lack important information or contain factual

    This advisory will be posted on Cisco's worldwide website at

    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.

        * (includes CERT/CC)

    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 1.0 2005-July-12 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
    This includes instructions for press inquiries regarding Cisco security
    notices. All Cisco security advisories are available at


    All contents are Copyright 1992-2005 Cisco Systems, Inc. All rights
    reserved. Important Notices <>
    and Privacy Statement <>.

    Version: PGP 7.0.1

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