A vulnerability has been reported in FreeBSD, which can be exploited by malicious people to cause a DoS (Denial of Service).
The vulnerability is caused due to an error in the "pf" Internet Protocol packet-filter fragment cache when handling IP fragments. This can be exploited to crash the system by sending a specially-crafted sequence of IP packet fragments to the packet filter.
Successful exploitation requires that "pf" is used with a ruleset containing "scrub fragment crop" or "scrub fragment drop-ovl" rules.
The vulnerability has been reported in version 5.3, 5.4, and 6.0.
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Subject: FreeBSD "pf" IP Fragment Denial of Service Vulnerability
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