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FreeBSD rtld execl() Privilege Escalation

Posted by deepcore on May 22, 2019 – 8:20 am

This Metasploit module exploits a vulnerability in the FreeBSD run-time link-editor (rtld). The rtld unsetenv() function fails to remove LD_* environment variables if __findenv() fails. This can be abused to load arbitrary shared objects using LD_PRELOAD, resulting in privileged code execution.


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