FreeBSD Security Advisory FreeBSD-SA-02:20 - Two denial of service vulnerabilities were found in the syn cookie implementation in FreeBSD. When a SYN was accepted via a syncookie, it used an uninitialized pointer to find the TCP options for the new socket. This pointer may be a null pointer, which will cause the machine to crash. In addition, restarting applications using syn cookie protected sockets can cause a reference to an old inpcb pointer, crashing the system.
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