Squid "strListGetItem()" Denial of Service Vulnerability

Secunia ID	SA36378
CVE-ID	CVE-2009-2855
Release Date	20 Aug 2009
Criticality	Less Critical
Solution Status	Unpatched
Software	Squid 2.x
Where	From remote
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.
Description	A vulnerability has been reported in Squid, which can be exploited by malicious people to cause a DoS (Denial of Service). The vulnerability is caused due to an error in the "strListGetItem()" function when parsing external authentication headers. This can be exploited to trigger the execution of an infinite loop via a header containing ',' characters. Successful exploitation requires that an "external_acl_type" configuration option defining a delimiter different from ',' is present. The vulnerability is reported in version 2.7.STABLE3. Other versions may also be affected.
Solution	Restrict access to trusted users only.
Reported by	Matt Benjamin
Original Advisory	http://www.squid-cache.org/bugs/show_bug.cgi?id=2541