Forum Discussion
ASM irule to disable attack signature authorization header with specific value
- Apr 10, 2023
Hi f5learner,
Can you try this iRule?
when ASM_REQUEST_DONE { if { [ASM::violation names] contains "VIOLATION_ATTACK_SIGNATURE_DETECTED" && [HTTP::header Authorization] starts_with "Bearer" } { ASM::unblock } }
Trigger ASM iRule Events Mode should be set Normal on the WAF policy.
Note that if the request has any violations other than "attack signature detected", the request will be completely unblocked.
- Apr 20, 2023
Hi,
When more than one violation occurs, if "Block" is active in one violation, but not in the other violation, the request_status for ASM::violation_data does not occur individually. It is defined as "block".
A separate control is required for violations that are not in the block. I think, rather than using such an iRule, a simple policy should be preferred.
https://clouddocs.f5.com/api/irules/ASM__violation_data.html
Thank you for your help
by changing to CONTAINS allowed bypass for other violations in Blocking mode as well, for example I blacklisted my source IP but the request was allowed so that should not happen
The flow could look like this
Part one
if ONLY violation name VIOLATION_ATTACK_SIGNATURE exist with Authorization header with value starts with Bearer - Unblock
it can be achieved per your initial help with following if statement with eq
if { [ASM::violation names] eq "VIOLATION_ATTACK_SIGNATURE_DETECTED" && [b64decode [llookup [ASM::violation details] "header.header_name"]] eq "Authorization" && [HTTP::header Authorization] starts_with "Bearer" }
second part would be
if ONLY violation name VIOLATION_ATTACK_SIGNATURE exist with Authorization header with value starts with Bearer (first part above) BUT ALSO ANY another violation exist BUT with ONLY Applied Blocking Settings Alarm and Learn or ALARM OR LEARN - then Unblock as well
accomplishing second part above would also ensure that Part one above will not be impacted if other triggers are only in alarm/learn mode?
I am not sure if it is possible to be that granular? please let me know thank you for your help
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