CVE-2009-4146

The exploit leverages a vulnerability in FreeBSD's Run-Time Link-Editor (rtld) to bypass restrictions on environment variables like LD_PRELOAD for setugid binaries, achieving local privilege escalation to root. It uses a crafted environment setup and a shared library to execute arbitrary commands with elevated privileges.

This Metasploit module exploits a vulnerability in FreeBSD's run-time link-editor (rtld) where `unsetenv()` fails to remove `LD_*` environment variables, allowing arbitrary shared object loading via `LD_PRELOAD` for privilege escalation.