Bug ID 790089: ASM SPA JavaScript code causes a web page to hang upon parallel ajax requests.

Last Modified: Dec 13, 2019

Bug Tracker

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

Known Affected Versions:
13.1.0, 13.1.0.1, 13.1.0.2, 13.1.0.3, 13.1.0.4, 13.1.0.5, 13.1.0.6, 13.1.0.7, 13.1.0.8, 13.1.1, 13.1.1.1, 13.1.1.2, 13.1.1.3, 13.1.1.4, 13.1.1.5, 13.1.3, 13.1.3.1, 13.1.3.2, 14.0.0, 14.0.0.1, 14.0.0.2, 14.0.0.3, 14.0.0.4, 14.0.0.5, 14.0.1, 14.0.1.1, 14.1.0, 14.1.0.1, 14.1.0.2, 14.1.0.3, 14.1.0.4, 14.1.0.5, 14.1.0.6, 14.1.2, 14.1.2.1, 14.1.2.2, 15.0.0, 15.0.1

Fixed In:
15.1.0

Opened: Jun 05, 2019
Severity: 2-Critical

Symptoms

A web page hangs when parallel AJAX requests being sent.

Impact

Web-page processing halts; endless loading image is posted.

Conditions

-- ASM provisioned. -- Single Page Application (SPA) enabled Bot Defense, DoS, or ASM Policy. -- Bot Defense, DoS, or ASM Policy attached to a virtual server. -- A web page sends two or more parallel AJAX requests.

Workaround

The issue was introduced in the May-2019 live-update file. Rolling back to the Apr-2019 file avoids the issue.

Fix Information

ASM SPA JavaScript code has been fixed and avoids endless stack traversing.

Behavior Change