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

Last Modified: Sep 14, 2023

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

Known Affected Versions:
13.1.1, 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, 13.1.3.3, 13.1.3.4, 13.1.3.5, 13.1.3.6, 13.1.4, 13.1.4.1, 13.1.5, 13.1.5.1, 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, 14.1.0.5, 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, 14.1.4.5, 14.1.4.6, 14.1.5, 14.1.5.1, 14.1.5.2, 14.1.5.3, 14.1.5.4, 14.1.5.6, 15.0.0, 15.0.1, 15.0.1.1, 15.0.1.2, 15.0.1.3, 15.0.1.4

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

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips