[NT] Microsoft Windows Kernel ANI File Parsing Crash and DOS Vulnerability

From: SecuriTeam (support_at_securiteam.com)
Date: 12/27/04

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Date: 27 Dec 2004 17:05:07 +0200

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      Microsoft Windows Kernel ANI File Parsing Crash and DOS Vulnerability
    ------------------------------------------------------------------------

    SUMMARY

    Parsing a specially crafted ANI file causes the Windows kernel to crash or
    stop to work properly. An attacker can crash or freeze a target system if
    he sends a specially crafted ANI file within an HTML page or within an
    Email.

    DETAILS

    ANI stands for Windows Animated Cursor and manages many images frames. Two
    vulnerabilities exist in the Windows kernel when it parses ANI files.

    A first vulnerability exists because there is no proper check of the frame
    number set in the ANI file header. If the Windows kernel try to parse the
    ANI file (offset 0x78 in the ANI file header) and the frame number is set
    to 0, the kernel will calculate a wrong address to access and then crash.

    A second vulnerability exists because there is (again) no proper check of
    the rate number set in the ANI file header. Setting this number to 0
    causes the windows kernel to use up to all of the system resources and
    then freeze.

    More details and POC at
    <http://www.xfocus.net/flashsky/icoExp/index.html>
    http://www.xfocus.net/flashsky/icoExp/index.html

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:fangxing@venustech.com.cn>
    Flashsky.

    ========================================

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