CVE-2009-4146 Information

Description

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.

Reference

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