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OpenSSH UseLogin Environment Variable Passing Vulnerability

OpenSSH is a freely available, open source implementation of the Secure Shell protocol. It is maintained by members of the OpenBSD team.

If OpenSSH is configured to use 'login' via the non-default UseLogin configuration option, local users may be able to have arbitrary environment variables set for the 'login' process. By setting LD_PRELOAD and creating a malicious shared library, it is possible for an attacker to execute arbitrary code as root.