Description
The accept_filter mechanism in FreeBSD 4 through 4.5 does not properly remove entries from the incomplete listen queue when adding a syncache, which allows remote attackers to cause a denial of service (network service availability) via a large number of connection attempts, which fills the queue.
References
- freebsd-accept-filter-dos(9209) vdb-entry
- 4879 vdb-entry
- 5081 vdb-entry
- FreeBSD-SA-02:26 vendor-advisory