CVE-2009-4147: Undefined Security Weakness

The rtld function in the Run-Time Link-Editor rtld in libexec/rtld-elf/rtld.c in FreeBSD 7.1 and 8.0 does not clear the 1 LDLIBMAP, 2 LDLIBRARYPATH, 3 LDLIBMAPDISABLE, 4 LDDEBUG, and 5 LDELFHINTSPATH environment variables, which allows local users to gain privileges by executing a setuid or setgu...