Bug ID 1382389: QDCOUNT LIMIT DoS vector Not working as expected.

Last Modified: Dec 05, 2024

Affected Product(s):
BIG-IP AFM(all modules)

Known Affected Versions:
17.1.0, 17.1.0.1, 17.1.0.2, 17.1.0.3, 17.1.1, 17.1.1.1, 17.1.1.2, 17.1.1.3, 17.1.1.4, 17.1.2

Opened: Oct 23, 2023

Severity: 3-Major

Symptoms

Two DoS vectors match the same type of traffic: -- Device: DNS Question Items != 1 -- Protection Profile: DNS QDCOUNT LIMIT If you have both of these DoS vectors configured, only the "DNS Question Items != 1" DoS vector is matched.

Impact

Only the "DNS Question Items != 1" alert is raised. Both of these DoS vectors have identical meanings internally, and so only "DNS Question Items != 1" will be triggered.

Conditions

-- Both "DNS QDCOUNT LIMIT" and "DNS Question Items != 1" are configured. -- The DOS vectors are triggered

Workaround

None

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips