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AUSCERT External Security Bulletin Redistribution
ESB-2020.2933
The BIG-IP ASM system may fail to properly mask the value of a configured
sensitive parameter in the request event log
26 August 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: BIG-IP ASM
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
Original Bulletin:
https://support.f5.com/csp/article/K02705117
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K02705117: The BIG-IP ASM system may fail to properly mask the value of a
configured sensitive parameter in the request event log
Security Advisory
Original Publication Date: 26 Aug, 2020
Security Advisory Description
When you configure a sensitive parameter for a security policy, the BIG-IP ASM
system may fail to properly mask the value in the request log. This issue
occurs when all of the following conditions are met:
o You enabled the Cross-Site Request Forgery (CSRF) Protection feature in the
affected security policy.
o You configured one or more sensitive parameters for the affected security
policy.
o You configured a logging profile to log requests to the virtual server
associated with the affected security policy. By default, when you create a
security policy, the system associates the profile for logging illegal
requests with the virtual server that is associated with the policy.
o The BIG-IP ASM system receives a HTTP POST request containing the
following:
A CSRF token in the URI
A CSRF token in the configured sensitive parameter
The CSRF token value in the request body
Impact
The system incorrectly masks the value of a sensitive parameter in the request
log. As a result, the value is exposed in the request log.
Symptoms
As a result of this issue, you may encounter one or more of the following
symptoms:
o The system incorrectly masks and exposes the sensitive parameter value of a
request in the BIG-IP ASM request log.
Security Advisory Status
F5 Product Development has assigned ID 871905 to this issue. F5 has confirmed
that this issue exists in the products listed in the Applies to (see versions)
box, located in the upper-right corner of this article. For information about
releases, point releases, or hotfixes that resolve this issue, refer to the
following table.
+------------------+-----------------+----------------------------------------+
|Type of fix |Fixes introduced |Related articles |
| |in | |
+------------------+-----------------+----------------------------------------+
|Release |16.0.0 |K2200: Most recent versions of F5 |
| | |software |
+------------------+-----------------+----------------------------------------+
|Point release/ |15.1.0.5 |K9502: BIG-IP hotfix and point release |
|hotfix |15.0.1.4 |matrix |
| |14.1.2.5 | |
+------------------+-----------------+----------------------------------------+
Security Advisory Recommended Actions
Workaround
None
- --------------------------END INCLUDED TEXT--------------------
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