[Full-disclosure] eEye Advisory - EEYEB-200505 - RealPlayer AVI Processing Overflow

Advisories_at_eeye.com
Date: 06/23/05

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    Date: Thu, 23 Jun 2005 11:46:17 -0700
To: <bugtraq@securityfocus.com>, <full-disclosure@lists.grok.org.uk>, <vulnwatch@vulnwatch.org>

    RealPlayer vidplin.dll AVI Processing Heap Overflow

    Release Date:
    June 23, 2005

    Date Reported:
    May 4, 2005

    Patch Development Time (In Days): 36

    Severity:
    High (Code Execution)

    Vendor:
    RealNetworks

    Systems Affected:
    For Microsoft Windows

    RealPlayer 10.5 (6.0.12.1040-1069)
    RealPlayer 10
    RealOne Player v2
    RealOne Player v1
    RealPlayer 8
    RealPlayer Enterprise

    Overview:
    eEye Digital Security has discovered a critical vulnerability in
    RealPlayer. The vulnerability allows a remote attacker to reliably
    overwrite heap memory with arbitrary data and execute arbitrary code in
    the context of the user who executed the player.

    This specific flaw exists within the vidplin.dll file used by
    RealPlayer. By specially crafting a malformed .avi movie file, a direct
    heap overwrite is triggered, and reliable code execution is then
    possible. This vulnerability can be trigger when a user views a
    webpage, or opens an .avi file via email, instant messenger, or other
    common file transfer programs.

    Technical Details:
    When processing AVI files RealPlayer calls upon a specific DLL,
    vidplin.dll, where the vulnerability lies. Realplayer relies
    on a strf structure value and allocates a fixed memory space of 0x428
    that can be overflowed with values greater than the fixed buffer size
    causing arbitrary code to be executed.

    Protection:
    Retina - Network Security Scanner - has been updated to identify this
    vulnerability.
    Blink - End-point Vulnerability Prevention - protects from this
    vulnerability.

    Vendor Status:
    RealNetworks has released a patch for this vulnerability.

    http://service.real.com/help/faq/security/050623_player/EN/

    Credit:
    Discovery: Flashsky

    Related Links:
    Retina Network Security Scanner - Free 15 Day Trial
    http://www.eeye.com/html/Products/Retina/download.html

    Blink End Point Vulnerability Prevention
    http://www.eeye.com/html/Products/Blink

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