The nullfs implementation in sys/fs/nullfs/null_vnops.c in the kernel in FreeBSD 8.3 through 9.2 allows local users with certain permissions to bypass access restrictions via a hardlink in a nullfs instance to a file in a different instance.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Freebsd | Freebsd | 8.0 (including) | 8.0 (including) |
| Freebsd | Freebsd | 8.3 (including) | 8.3 (including) |
| Freebsd | Freebsd | 8.4 (including) | 8.4 (including) |
| Freebsd | Freebsd | 9.0 (including) | 9.0 (including) |
| Freebsd | Freebsd | 9.1 (including) | 9.1 (including) |
| Freebsd | Freebsd | 9.2 (including) | 9.2 (including) |
References
- http://secunia.com/advisories/54861
- http://svnweb.freebsd.org/base?view=revision\u0026revision=255442
- http://www.debian.org/security/2013/dsa-2769
- http://www.freebsd.org/security/advisories/FreeBSD-SA-13:13.nullfs.asc
- http://www.securitytracker.com/id/1029015
- http://secunia.com/advisories/54861
- http://svnweb.freebsd.org/base?view=revision\u0026revision=255442
- http://www.debian.org/security/2013/dsa-2769
- http://www.freebsd.org/security/advisories/FreeBSD-SA-13:13.nullfs.asc
- http://www.securitytracker.com/id/1029015