NetChat HTTP Server Stack Overflow

[<dbd () hushmail com>]

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NetChat HTTP Server Stack Overflow

RELEASE DATE:   May 16, 2004

DATE REPORTED:  May 12, 2004

RISK:           Medium

IMPACT:         Attackers may be able to execute
                arbitrary code with the privileges
                of the user running the applicaton.

VERSIONS:       <= 7.3

OVERVIEW:

        NetChat is an application intended to allow users on the same
        subnet to chat with one another.  It comes with an integrated
        web server for sharing files.  The web server in versions
        7.3 and earlier is vulnerable to a stack-based buffer overflow
        allowing for arbitrary code execution under the security
         context of the user running the application.

DETAILS:

        The overflow condition exists due to an unchecked call to
         _sprintf       when the HTTP server attempts to handle a GET
         request.  This allows the attacker to overwrite a pointer
         that is later referenced in the same function.

VENDOR STATUS:

        The vendor has released version 7.4 to address this
         vulnerability.

CREDIT:
        Discovery:        Marius Huse Jacobsen
                          Email: mahuja () c2i net
        Research/Exploit:   David Dewey
                          Email: dbd () hushmail com

THANKS: skape - for your help with my questions on shellcode and
                 great help with the additional analysis.

RELATED LINKS:

        http://run.to/sz

FEEDBACK:

        Please send questions and comments to dbd () hushmail com
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