Ubuntu Security Notice 394-1 – An error was found in Ruby’s CGI library that did not correctly quote the boundary 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/52875/USN-394-1.txt
Source: https://packetstormsecurity.com/files/52875/Ubuntu-Security-Notice-394-1.html