NetBSD Information for VU#539363

State-based firewalls fail to effectively manage session table resource exhaustion


Not Affected

Vendor Statement


IPFilter is not vulnerable to this attack as it already implements aggressive flushing of the state table when it detects it to be full.

UDP Flood

There is no specific attack here that IPFilter needs to defend against. It will time things out according to timeouts set for UDP (can be done
on a per-rule basis.)

Crikey CRC Flood

IPFilter does not currently allow packets to be rejected because of bad CRC's but the problem posed here is dealt with in the two aforementioned


IPFilter supports the use of separate timeout values for initial sessions and allows connection tracking to be disabled.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Vendor References



The CERT/CC has no additional comments at this time.

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