Cross-Site Request Forgery (CSRF) in CMS Made Simple

[advisory@xxxxxxxxxxxx]

Advisory ID: HTB23121
Product: CMS Made Simple
Vendor: cmsmadesimple.org
Vulnerable Version(s): 1.11.2 and probably prior
Tested Version: 1.11.2
Vendor Notification: October 17, 2012 
Public Disclosure: November 7, 2012 
Vulnerability Type: Cross-Site Request Forgery [CWE-352]
CVE Reference: CVE-2012-5450
CVSSv2 Base Score: 2.6 (AV:N/AC:H/Au:N/C:N/I:N/A:P)
Solution Status: Fixed by Vendor
Risk Level: Low 
Discovered and Provided: High-Tech Bridge Security Research Lab ( 
https://www.htbridge.com/advisory/ ) 

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Advisory Details:

High-Tech Bridge Security Research Lab discovered vulnerability in CMS Made 
Simple, which can be exploited to perform cross-site request forgery (CSRF) 
attacks.


1. Сross-Site Request Forgery (CSRF) in CMS Made Simple: CVE-2012-5450

The application allows authorized administrator to perform certain actions via 
HTTP requests without making proper validity checks to verify the source of the 
requests. This can be exploited to delete arbitrary files and directories.

An attacker should make logged-in administrator open a malicious link in the 
browser to exploit this vulnerability.

The following PoC (Proof of Concept) code will delete the root directory with 
all files leading to complete destroy of the CMS:

http://[host]/lib/filemanager/imagemanager/images.php?deld=../../
<img src="http://[host]/lib/filemanager/imagemanager/images.php?deld=../../"; 
width=1 height=1>

Successful exploitation requires that user under which the web server is 
running has write access to files or directories to delete. 

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Solution:

Upgrade to CMSMS 1.11.2.1

More Information:
http://forum.cmsmadesimple.org/viewtopic.php?f=1&t=63545

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References:

[1] High-Tech Bridge Advisory HTB23121 - 
https://www.htbridge.com/advisory/HTB23121 - Сross-Site Request Forgery (CSRF) 
in CMS Made Simple.
[2] CMS Made Simple - http://www.cmsmadesimple.org - CMS Made Simple, an open 
source content management system, allows for faster and easier management of 
website content. This CMS is scalable for small businesses to large 
corporations.
[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.