Ubuntu Security Notice USN-334-1 – Michael Calmer and Marcus Meissner discovered that several krb5 tools did not check the return values from setuid() system calls. On systems that have configured user process limits, it may be possible for an attacker to cause setuid() to fail via resource starvation. In that situation, the tools will not reduce their privilege levels, and will continue operation as the root user.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/49336/USN-334-1.txt
Source: https://packetstormsecurity.com/files/49336/Ubuntu-Security-Notice-334-1.html