Bug ID 648617: JavaScript challenge repeating in loop when URL has path parameters

Last Modified: Sep 13, 2023

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

Known Affected Versions:
11.6.0, 11.6.1, 11.6.2, 11.6.3,,,,, 11.6.4, 11.6.5,,,, 12.0.0, 12.0.0 HF1, 12.1.0 HF1, 12.0.0 HF2, 12.1.0 HF2, 12.0.0 HF3, 12.0.0 HF4, 12.1.1 HF1, 12.1.1 HF2, 12.1.2 HF1, 12.1.2 HF2, 12.1.0, 12.1.1, 12.1.2

Fixed In:

Opened: Mar 02, 2017

Severity: 3-Major

Related Article: K23432927


The JavaScript challenge is repeating in a loop on URLs which have path parameters (when the URL contains the ';' character). The request never reaches the back-end server. This happens in the following challenges: * Proactive Bot Defense with Suspicious Browsers enabled * Client-Side Integrity Defense In the rest of the challenges, the challenges will succeed, but POST requests will not be reconstructed correctly and sent as a multipart message to the back-end server.


Requests with ';' character will be blocked and the browser will repeat the challenge in a loop.


URLs contain the ';' character, AND: Either: * Proactive Bot Defense with Suspicious Browsers enabled, OR * Client-Side Integrity Defense is enabled and is used as a DoSL7 mitigation during an attack.



Fix Information

The JavaScript challenge no longer gets stuck in a loop on URLs which have path parameters.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips