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ImmuniWebSecurity Advisories ArchiveHTB22835

Denial of Service Vulnerability in FlatnuX

Advisory ID:HTB22835
Product:FlatNux
Vendor:Alessandro Vernassa
Vulnerable Versions:flatnux-2011-01.26 and probably prior
Tested Version:flatnux-2011-01.26
Advisory Publication:February 3, 2011 [without technical details]
Vendor Notification:February 3, 2011
Public Disclosure:February 17, 2011
Vulnerability Type:Infinite Loop [CWE-835]
Risk Level:Medium
CVSSv2 Base Score:5 (AV:N/AC:L/Au:N/C:N/I:N/A:P)
Solution Status:Fixed by Vendor
Discovered and Provided:High-Tech Bridge Security Research Lab
 

Advisory Details:

High-Tech Bridge SA Security Research Lab has discovered vulnerabilities in FlatnuX which could be exploited to cause a denial of service.
1) Denial of service vulnerability in FlatnuX
The vulnerability exists due to endless loop in the login.html script. A remote attacker can send a specially crafted HTTP request to the vulnerable script and consume all available memory allowed in PHP configuration.
Exploitation example:
http://host/login.html?mod[]=login&op=modprof&user=dos

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Solution:
Upgrade to flatnux-2011-02.03.


References:
[1] High-Tech Bridge Advisory HTB22835 - https://www.immuniweb.com/advisory/HTB22835 - Denial of Service Vulnerability in FlatnuX
[2] FlatnuX - flatnux.altervista.org- Flatnux is a CMS (Content Management System) that makes no use of DBMS, but only text files.
[3] Common Weakness Enumeration (CWE) - http://cwe.mitre.org - targeted to developers and security practitioners, CWE is a formal list of software weakness types.
Related Security Advisories: HTB22402: Cross-site Scripting (XSS) Vulnerabilities in FlatNux CMS HTB22834: Installation Path Disclosure Weakness in Flatnux
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