The do_write_pids function in lxcfs.c in LXCFS before 0.12 does not properly check permissions, which allows local users to gain privileges by writing a pid to the tasks file.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-1344
Reference (s):
- https://bugs.launchpad.net/ubuntu/+source/lxcfs/+bug/1512854
- https://github.com/lxc/lxcfs/commit/8ee2a503e102b1a43ec4d83113dc275ab20a869a
- UBUNTU:USN-2813-1
- URL: http://www.ubuntu.com/usn/USN-2813-1