This Metasploit module exploits a vulnerability that can be used to modify portions of a process's address space, which may lead to privilege escalation. Systems such as FreeBSD 9.0 and 9.1 are known to be vulnerable.
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Linux 2.6.9 fixes a set of race conditions in the Linux terminal subsystem which are believed to go back to 2.2 kernels if not earlier. The race shows up problematically in two places.
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