Bug ID 531539: The NTLM login is not recognized as failed login.

Last Modified: Sep 13, 2023

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

Known Affected Versions:
11.5.1 HF1, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.5.1 HF10, 11.5.1 HF11, 11.5.2 HF1, 11.5.3 HF1, 11.5.3 HF2, 11.5.4 HF1, 11.5.4 HF2, 11.5.4 HF3, 11.5.4 HF4, 12.1.0 HF1, 12.1.0 HF2, 12.1.1 HF1, 12.1.1 HF2, 12.1.2 HF1, 12.1.2 HF2

Fixed In:
12.0.0, 11.6.0 HF6

Opened: Jul 02, 2015

Severity: 3-Major

Related Article: K05113177

Symptoms

The NTLM login is not recognized as failed login.

Impact

The brute force mitigation will not work in this case.

Conditions

-- A NTLM configured login page. -- The username arrives in UTF-16 (as curl sends it) or in another encoding that cannot be converted. -- The login fails.

Workaround

None.

Fix Information

This release fixes an issue regarding login pages with the NTLM authentication type.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips