[UNIX] Clam Antivirus Code Execution Vulnerability

From: SecuriTeam (support_at_securiteam.com)
Date: 11/06/05

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Date: 6 Nov 2005 13:33:06 +0200

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      Clam Antivirus Code Execution Vulnerability
    ------------------------------------------------------------------------

    SUMMARY

    Clam AntiVirus is "a GPL anti-virus toolkit for UNIX. The main purpose of
    this software is the integration with mail servers (attachment scanning)".

    The following vulnerability allows remote attackers to execute arbitrary
    code on vulnerable ClamAV installations.

    DETAILS

    Vulnerable Systems:
     * Clam AntiVirus versions 0.80 through 0.87

    Immune Systems:
     * Clam AntiVirus versions 0.87.1 available from
    <http://sourceforge.net/project/showfiles.php?group_id=86638> here

    This specific flaw exists within libclamav/fsg.c during the unpacking of
    executable files compressed with FSG v1.33. Due to invalid bounds checking
    when copying user-supplied data to heap allocated memory, an exploitable
    memory corruption condition is created. The unpacking algorithm for other
    versions of FSG is not affected.

    Disclosure Timeline:
    24.10.05 - Vulnerability reported to vendor
    24.10.05 - Digital Vaccine released to TippingPoint customers
    25.10.05 - Vulnerability information provided to ZDI security partners
    04.11.05 - Public release of advisory

    ADDITIONAL INFORMATION

    The original article can be found at:
    <http://www.zerodayinitiative.com/advisories/ZDI-05-002.html>
    http://www.zerodayinitiative.com/advisories/ZDI-05-002.html

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