Ubuntu Security Notice 371-1: An error was found in Ruby’s CGI library that did not correctly check for the end of multipart MIME requests. Using a crafted HTTP request, a remote user could cause a denial of service, where Ruby CGI applications would end up in a loop, monopolizing a CPU.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/51596/USN-371-1.txt
Source: https://packetstormsecurity.com/files/51596/Ubuntu-Security-Notice-371-1.html