CUPS Subscription Incorrectly uses Guest Account DoS Vulnerability

Summary
This host is running CUPS (Common UNIX Printing System) Service, which is prone to Denial of Service Vulnerability.
Impact
Successful exploitation causes Denial of Service condition. Impact Level: Application
Solution
Upgrade to CUPS Version 1.3.8 or later. http://www.cups.org/software.php
Insight
The flaw is due to error in web interface (cgi-bin/admin.c), which uses the guest username when a user is not logged on to the web server. This leads to CSRF attacks with the add/cancel RSS subscription functions.
Affected
CUPS Versions prior to 1.3.8 on Linux.
References