cve/2009/CVE-2009-4146.md

CVE-2009-4146

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.

POC

Reference

• http://packetstormsecurity.com/files/152997/FreeBSD-rtld-execl-Privilege-Escalation.html

Github

• https://github.com/Snoopy-Sec/Localroot-ALL-CVE