The _rtld function in the Run-Time Link-Editor (rtld) in libexec/rtld-elf/rtld.c in FreeBSD 7.1, 7.2, and 8.0 does not clear the LD_PRELOAD environment variable, which allows local users to gain privileges by executing a setuid or setguid program with a modified LD_PRELOAD variable containing an untrusted search path that points to a Trojan horse library, a different vector than CVE-2009-4147.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Freebsd | Freebsd | 7.1 (including) | 7.1 (including) |
| Freebsd | Freebsd | 7.2 (including) | 7.2 (including) |
| Freebsd | Freebsd | 8.0 (including) | 8.0 (including) |
References
- http://packetstormsecurity.com/files/152997/FreeBSD-rtld-execl-Privilege-Escalation.html
- http://people.freebsd.org/~cperciva/rtld.patch
- http://secunia.com/advisories/37517
- http://www.securityfocus.com/archive/1/508142/100/0/threaded
- http://www.securityfocus.com/archive/1/508146/100/0/threaded
- http://www.securityfocus.com/archive/1/508168/100/0/threaded
- http://www.securityfocus.com/bid/37154
- http://www.securitytracker.com/id?1023250
- http://packetstormsecurity.com/files/152997/FreeBSD-rtld-execl-Privilege-Escalation.html
- http://people.freebsd.org/~cperciva/rtld.patch
- http://secunia.com/advisories/37517
- http://www.securityfocus.com/archive/1/508142/100/0/threaded
- http://www.securityfocus.com/archive/1/508146/100/0/threaded
- http://www.securityfocus.com/archive/1/508168/100/0/threaded
- http://www.securityfocus.com/bid/37154
- http://www.securitytracker.com/id?1023250