[NEWS] Kaspersky Anti-Virus Engine CHM File Parser Buffer Overflow

From: SecuriTeam (support_at_securiteam.com)
Date: 10/11/05

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Date: 11 Oct 2005 10:17:28 +0200

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      Kaspersky Anti-Virus Engine CHM File Parser Buffer Overflow
    ------------------------------------------------------------------------

    SUMMARY

    Kaspersky Anti-Virus Engine (KAV) is "a popular virus scanning engine for
    Windows and Linux. The Kaspersky Anti-Virus Engine is commonly included in
    various vendors' network mail gateway and host-based antivirus products".

    Remote exploitation of a buffer overflow vulnerability in Kaspersky Labs'
    Anti-Virus Engine allows remote attackers to execute arbitrary code.
    Kaspersky Anti-Virus Engine is used by multiple vendors in Linux virus
    scanner products and exploitation requires minimal interaction by a
    targeted user.

    DETAILS

    Vulnerable Systems:
     * Kaspersky Personal version 5.0.227
     * Kaspersky Anti-Virus On-Demand Scanner for Linux version 5.0.5
     * F-Secure Anti-Virus for Linux version 4.50

    The Kasperksy Anti-Virus Engine (KAV) is found in many gateway and
    host-based anti-virus scanners. The vulnerability specifically exists in
    the CHM file parser within the KAV engine. When a corrupt CHM file is
    scanned by the KAV engine, a heap overflow can occur which allows remote
    attackers to execute arbitrary code with permissions of the anti-virus
    application's process, usually user privileges. On Microsoft platforms,
    affected software has not been shown to execute arbitrary code, however
    Kaspersky Anti-Virus will fail to scan any files after a corrupt CHM file
    has been encountered, thus allowing further malicious codes to reach the
    target.

    Analysis:
    Successful exploitation of the vulnerability can result in remote
    arbitrary code execution or the disabling of anti-virus functionality.
    In the case of Linux platforms, specifically network gateways, user
    interaction is not required and can lead to the compromise of trusted
    systems. In addition, compromising mail gateways can lead to further
    compromise of internal hosts by injecting malicious code into mail
    attachments.

    Vendor response:
    The vendor has notified iDEFENSE that the vulnerability has been addressed
    via a signature update. Users who have updated their signatures after July
    2005 are reportedly not affected. Update your anti-virus signatures to
    ensure the vulnerability has been addressed.

    CVE Information:
     <http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2937>
    CAN-2005-2937

    Disclosure Timeline:
    06/20/2005 - Initial vendor notification
    10/05/2005 - Initial vendor response
    10/10/2005 - Public disclosure

    ADDITIONAL INFORMATION

    The information has been provided by
    <mailto:idlabs-advisories@lists.idefense.com> iDEFENSE Labs Security
    Advisories.
    The original article can be found at:
    <http://www.idefense.com/application/poi/display?id=318&type=vulnerabilities> http://www.idefense.com/application/poi/display?id=318&type=vulnerabilities

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