[UNIX] Mathopd Insecure Dump File Creation

From: SecuriTeam (support_at_securiteam.com)
Date: 03/28/05

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Date: 28 Mar 2005 10:22:46 +0200

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      Mathopd Insecure Dump File Creation
    ------------------------------------------------------------------------

    SUMMARY

    " <http://www.mathopd.org/> Mathopd is a very small, yet very fast HTTP
    server for UN*X systems. Mathopd supports useful features of HTTP/1.1,
    such as persistent connections, partial responses and pipelining. It does
    not support things like content negotiation. The latest version of the
    software (1.5) also supports CGI/1.1".

    Recently discovered vulnerability in Mathopd, can be exploited by
    malicious local users to corrupt the contents of arbitrary files on a
    vulnerable system.

    DETAILS

    Vulnerable Systems:
     * Mathopd version 1.5p4
     * Mathopd version 1.6b5

    Immune Systems:
     * Mathopd version 1.5p5
     * Mathopd version 1.6b6 Beta

    The vulnerability is caused due to the "internal_dump()" function creating
    dump files insecurely when a SIGWINCH signal is caught. This can be
    exploited via symlink attacks to append dump data to arbitrary files on
    the system with the privileges of the user running Mathopd.

    Successful exploitation requires that Mathopd is running with the "-n"
    command line option, and the user running Mathopd resizes the terminal
    window.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:michiel@boland.org> Michiel
    Boland.
    The original article can be found at:
    <http://www.mail-archive.com/mathopd%40mathopd.org/msg00272.html>
    http://www.mail-archive.com/mathopd%40mathopd.org/msg00272.html

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