FreeBSD 4.5 syncache / syncookies Denial Of Service Vulnerability

Recent versions of FreeBSD 4.5 include support for a SYN cache (syncache) and SYN cookies (syncookies) mechanism. This provides some level of protection from a class of denial of service flooding attacks.

Multiple denial of service issues have been reported in some versions of these features. A malicious attacker may be able to take advantage of these issues to cause the vulnerable system to crash. A restart may be required in order to regain normal functionality.


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