ModSecurity Detection Bypass and Denial of Service Vulnerabilities

Secunia ID	SA38460
Release Date	09 Feb 2010
Criticality	Moderately Critical Typically used for remotely exploitable Denial of Service vulnerabilities against services like FTP, HTTP, and SMTP, and for vulnerabilities that allow system compromises but require user interaction. This rating is also used for vulnerabilities allowing system compromise on LANs in services like SMB, RPC, NFS, LPD and similar services that are not intended for use over the Internet.
Solution Status	Vendor Patch
Software	ModSecurity 2.x
Where	From remote "From remote" describes other vulnerabilities where the attack vector doesn't require access to the system or a local network. This category covers services that are acceptable to expose to the Internet (e.g. HTTP, HTTPS, SMTP). It also covers client applications used on the Internet and certain vulnerabilities where it is reasonable to assume that a security conscious user can be tricked into performing certain actions.
Impact	DoS (Denial of Service) This includes vulnerabilities ranging from excessive resource consumption (e.g. causing a system to use a lot of memory) to crashing an application or an entire system. Security Bypass This covers vulnerabilities or security issues where malicious users or people can bypass certain security mechanisms of the application. The actual impact varies significantly depending on the design and purpose of the affected application.
Description	Some vulnerabilities have been reported in ModSecurity, which can be exploited by malicious people to bypass certain security restrictions and cause a DoS (Denial of Service). The vulnerabilities are caused due to unspecified errors, which can be exploited to bypass certain detection mechanisms and cause a DoS. The vulnerabilities are reported in versions prior to 2.5.12.
Solution	Update to version 2.5.12.
Reported by	The vendor credits the Sogeti/ESEC R&D team.
Original Advisory	http://freshmeat.net/projects/modsecurity/releases/312017 http://sourceforge.net/projects/mod-security/files/modsecurity-apache/2.5.12/CHANGES_2.5.12.txt/download