[NT] WinRAR Format String and Buffer Overflow Vulnerabilities

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

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Date: 11 Oct 2005 18:09:28 +0200

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      WinRAR Format String and Buffer Overflow Vulnerabilities
    ------------------------------------------------------------------------

    SUMMARY

    Secunia Research has discovered two vulnerabilities in WinRAR, which can
    be exploited by malicious people to compromise a user's system.

    DETAILS

    Vulnerable Systems:
     * WinRAR version 3.50

    Immune Systems:
     * WinRAR version 3.51

    1) A format string error exists when displaying a diagnostic error message
    that informs the user of an invalid filename in an UUE/XXE encoded file.
    This can be exploited to execute arbitrary code when a malicious UUE/XXE
    file is decoded.

    Proof of Concept:
    The following file will trigger the format string vulnerability in WinRAR
    begin 644 %0.8x.%0.8x.%0.8x.%0.8x.%0.8xAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    `
    end

    2) A boundary error in UNACEV2.DLL can be exploited to cause a stack-based
    buffer overflow. This allows arbitrary code execution when a malicious ACE
    archive containing a file with an overly long file name is extracted.

    Time Table:
    30/09/2005 - Initial vendor notification
    30/09/2005 - Initial vendor reply
    10/10/2005 - Vendor released fixed version
    11/10/2005 - Public disclosure

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:vuln@secunia.com> Secunia
    Research.
    The original article can be found at:
    <http://secunia.com/secunia_research/2005-53/advisory/>
    http://secunia.com/secunia_research/2005-53/advisory/

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