[UNIX] UPB Discussion Board/Web-Site Takeover

From: SecuriTeam (support_at_securiteam.com)
Date: 05/26/03

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Date: 26 May 2003 17:37:19 +0200

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      UPB Discussion Board/Web-Site Takeover
    ------------------------------------------------------------------------

    SUMMARY

    There is serious vulnerability in UPB (Ultimate PHP Board) that allows
    attackers to execute arbitrary PHP code. A vulnerability in the product
    allows remote attackers to insert PHP code into the log file causing it to
    be executed once the administrator views the log.

    DETAILS

    Vulnerable systems:
     * Ultimate PHP Board version 1.9

    The product takes incoming data from the user without filtering it for
    malicious code, this allows an attacker to use the REMOTE_ADDR,
    HTTP_USER_AGENT, etc to insert PHP code into the log file. This PHP code
    will be executed by the log file viewer, as the log file viewer doesn't
    filter out code form the log file.

    Example:
    Using the following commands:
    $ telnet hostname 80
    Connected to hostname at 80
    GET /board/index.php HTTP/1.0
    User-Agent: <? phpinfo(); ?>

    A PHP code will be inserted into the log file, and then when the
    administrator calls the admin_iplog.php file the PHP code is executed.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:just-a-user@yandex.ru>
    euronymous.

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

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