procfs in FreeBSD and possibly other operating systems allows local users to bypass access control restrictions for a jail environment and gain additional privileges.
| Software | From | Fixed in |
|---|---|---|
| freebsd / freebsd | 3.5.1 | 3.5.1.x |
| freebsd / freebsd | 4.1 | 4.1.x |
| freebsd / freebsd | 4.1.1 | 4.1.1.x |
| freebsd / freebsd | 4.2 | 4.2.x |