Bug ID 1078065: The login page shows blocking page instead of CAPTCHA or showing blocking page after resolving a CAPTCHA.

Last Modified: May 15, 2024

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

Known Affected Versions:
15.1.2, 15.1.2.1, 15.1.3, 15.1.3.1, 15.1.4, 15.1.4.1, 15.1.5, 15.1.5.1, 15.1.6, 15.1.6.1, 15.1.7, 15.1.8, 15.1.8.1, 15.1.8.2, 16.1.0, 16.1.1, 16.1.2, 16.1.2.1, 16.1.2.2, 16.1.3, 16.1.3.1, 16.1.3.2, 16.1.3.3, 16.1.3.4, 16.1.3.5, 17.1.0, 17.1.0.1, 17.1.0.2, 17.1.0.3

Fixed In:
17.1.1, 16.1.4, 15.1.9

Opened: Feb 03, 2022

Severity: 3-Major

Symptoms

The login page shows a blocking page instead of CAPTCHA or shows the blocking page after resolving a CAPTCHA. Make five (configured in brute force configuration) failed login attempts and you will receive a blocking page. Blocking Reason: Resource not qualified for injection. In one instance, bd crashed.

Impact

Users are blocked after failed login attempts. bd crash that cause BIG-IP failover in HA setup or temporarily offline in standalone setup.

Conditions

HTML response message has an html page with a length greater than 32000 bytes. For bd crashing issue, actual encoding of HTML document differs from what is specified in meta charset.

Workaround

Run tmsh modify sys db asm.cs_qualified_urls value <url value>. For bd crash, match actual file encoding and what is specified in charset.

Fix Information

N/A

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips