Bug ID 964989: AFM DOS half-open does not handle wildcard virtual servers properly.

Last Modified: Nov 26, 2020

Bug Tracker

Affected Product:  See more info
BIG-IP AFM(all modules)

Known Affected Versions:
14.1.0, 14.1.0.1, 14.1.0.2, 14.1.0.3, 14.1.0.5, 14.1.0.6, 14.1.2, 14.1.2.1, 14.1.2.2, 14.1.2.3, 14.1.2.4, 14.1.2.5, 14.1.2.6, 14.1.2.7, 14.1.2.8, 15.1.0, 15.1.0.1, 15.1.0.2, 15.1.0.3, 15.1.0.4, 15.1.0.5, 15.1.1, 15.1.2, 16.0.0, 16.0.0.1, 16.0.1

Opened: Nov 16, 2020
Severity: 2-Critical

Symptoms

AFM DOS half-open vector does not handle wildcard virtual servers properly.

Impact

- Wrong statistics reporting. - Wrong status of syncookie protection. - Unexpected traffic drops.

Conditions

-- Wildcard virtual-server. -- AFM DOS half-open vector configured. -- Attacks towards multiple destinations covered by a single virtual-server.

Workaround

Split wildcard virtual server into a series of /32 virtual servers.

Fix Information

None

Behavior Change