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.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Ubuntu_linux | Canonical | 15.04 (including) | 15.04 (including) |
| Ubuntu_linux | Canonical | 15.10 (including) | 15.10 (including) |
| Lxcfs | Ubuntu | devel | * |
| Lxcfs | Ubuntu | vivid | * |
| Lxcfs | Ubuntu | wily | * |
References
- http://www.ubuntu.com/usn/USN-2813-1
- https://bugs.launchpad.net/ubuntu/+source/lxcfs/+bug/1512854
- https://github.com/lxc/lxcfs/commit/8ee2a503e102b1a43ec4d83113dc275ab20a869a
- http://www.ubuntu.com/usn/USN-2813-1
- https://bugs.launchpad.net/ubuntu/+source/lxcfs/+bug/1512854
- https://github.com/lxc/lxcfs/commit/8ee2a503e102b1a43ec4d83113dc275ab20a869a