Bug ID 874153: Bot Defense 'Web RootKit' Anomaly False Positive using Seznam.cz Browser on iOS

Last Modified: Nov 22, 2021

Bug Tracker

Affected Product:  See more info
BIG-IP ASM(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, 14.1.3, 14.1.3.1, 14.1.4, 14.1.4.1, 14.1.4.2, 14.1.4.3, 14.1.4.4

Fixed In:
16.0.0

Opened: Jan 29, 2020
Severity: 3-Major

Symptoms

When using Bot Defense profile with browser verification, and sending a request using Seznam.cz Browser - 'Web RootKit' anomaly is detected and the client is blocked.

Impact

The client is blocked.

Conditions

-- Bot Defense profile is used, with a 'Verify After Access' or 'Verify Before Access' Browser Validation. -- Request is sent using Seznam.cz browser on iOS.

Workaround

Change the bigDB variable for minimum web rootkit allowed to a higher value. This allows all web rootkited browsers. tmsh modify sys db botdefense.min_rootkit_functions value 100

Fix Information

Disable Web Rootkit tests for Seznam.cz browser on iOS. Note: Fix is valid only when not using Device ID Collection.

Behavior Change