Last Modified: Dec 18, 2024
Affected Product(s):
BIG-IP ASM
Known Affected Versions:
15.1.0, 15.1.0.1, 15.1.0.2, 15.1.0.3, 15.1.0.4, 15.1.0.5, 15.1.1, 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, 15.1.9, 15.1.9.1, 15.1.10, 15.1.10.2, 15.1.10.3, 15.1.10.4, 15.1.10.5, 15.1.10.6, 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, 16.1.4, 16.1.4.1, 16.1.4.2, 16.1.4.3, 16.1.5, 16.1.5.1, 17.1.0, 17.1.0.1, 17.1.0.2, 17.1.0.3, 17.1.1, 17.1.1.1, 17.1.1.2, 17.1.1.3, 17.1.1.4
Fixed In:
17.1.2
Opened: May 06, 2024 Severity: 3-Major
The captcha prompt is not presented when the request size (headers and body) is large.
No new captcha prompt after submitting an empty or incorrect answer.
-- Enable brute force feature with captcha mitigation or use irule. -- Trigger a captcha for a request that originally is more than 10KB. -- Size of headers and body together is more than 10KB.
None
1. change parameter request_buffer_size to be more than the actual request size. example: if request (headers + body) is in total is 11K then increase request_buffer_size to 12K. (under Security ›› Options : Application Security : Advanced Configuration : System Variables ›› Edit System Variable). 2. increasing internally the buffer.