A security bug in the latest version of the FreeBSD can be exploited to grant unprivileged users complete control over the operating system, a German researcher said Monday.
The flaw is present in FreeBSD 8.0 and is known to affect versions 7.1 and 7.2 of the open-source OS, Nikolaos Rangos told The Register. He said it was "unbelievably simple" to exploit. Shortly after he disclosed the flaw on the Full Disclosure mailing list, other researchers said they were able to confirm the bug.
The bug resides in FreeBSD's run-time link editor. A binary run by an unprivileged user can be executed with administrative privileges in a restricted environment, Rangos said. That allows the user to obtain root access to the system. All that's required to run the exploit code, which Rangos included in his post, is a command shell.