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AUSCERT External Security Bulletin Redistribution
ESB-2021.2866
iControl SOAP vulnerability CVE-2021-23026
25 August 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: BIG-IP
BIG-IQ
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Cross-site Request Forgery -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2021-23026
Original Bulletin:
https://support.f5.com/csp/article/K53854428
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K53854428: iControl SOAP vulnerability CVE-2021-23026
Original Publication Date: 24 Aug, 2021
Security Advisory Description
BIG-IP and BIG-IQ are vulnerable to cross-site request forgery (CSRF) attacks
through iControl SOAP. (CVE-2021-23026)
Impact
An attacker may trick authenticated users into performing critical actions.
This vulnerability can only be exploited through the control plane and cannot
be exploited through the data plane. Exploitation can lead to complete system
compromise.
Security Advisory Status
F5 Product Development has assigned ID 935433 (BIG-IP) and ID 935433-8 (BIG-IQ)
to this vulnerability.
To determine if your product and version have been evaluated for this
vulnerability, refer to the Applies to (see versions) box. To determine if your
release is known to be vulnerable, the components or features that are affected
by the vulnerability, and for information about releases, point releases, or
hotfixes that address the vulnerability, refer to the following table. For more
information about security advisory versioning, refer to K51812227:
Understanding security advisory versioning.
Note: After a fix is introduced for a given minor branch, that fix applies to
all subsequent maintenance and point releases for that branch, and no
additional fixes for that branch will be listed in the table. For example, when
a fix is introduced in 14.1.2.3, the fix also applies to 14.1.2.4, and all
later 14.1.x releases (14.1.3.x., 14.1.4.x). For more information, refer to
K51812227: Understanding security advisory versioning. Additionally, software
versions preceding those listed in the following table have reached the End of
Technical Support (EoTS) phase of their lifecycle and are no longer evaluated
for security issues. For more information, refer to the Security hotfixes
section of K4602: Overview of the F5 security vulnerability response policy.
+------------+------+--------------+----------+----------+------+-------------+
| | |Versions known|Fixes | |CVSSv3|Vulnerable |
|Product |Branch|to be |introduced|Severity |score^|component or |
| | |vulnerable^1 |in | |2 |feature |
+------------+------+--------------+----------+----------+------+-------------+
| |16.x |16.0.0 - |16.1.0^3 | | | |
| | |16.0.1 |16.0.1.2^3| | | |
| +------+--------------+----------+ | | |
| |15.x |15.1.0 |15.1.3^3 | | | |
| | |- 15.1.2 | | | | |
| +------+--------------+----------+ | | |
| |14.x |14.1.0 - |14.1.4.2^3| | | |
|BIG-IP (all | |14.1.4 | | | | |
|modules) +------+--------------+----------+High |7.5 |iControl SOAP|
| |13.x |13.1.0 - |13.1.4.1^3| | | |
| | |13.1.4 | | | | |
| +------+--------------+----------+ | | |
| |12.x |12.1.0 - |Will not | | | |
| | |12.1.6 |fix | | | |
| +------+--------------+----------+ | | |
| |11.x |11.6.1 - |Will not | | | |
| | |11.6.5 |fix | | | |
+------------+------+--------------+----------+----------+------+-------------+
| |8.x |8.0.0 - 8.1.0 |None | | | |
|BIG-IQ +------+--------------+----------+ | | |
|Centralized |7.x |7.0.0 - 7.1.0 |None |High |7.5 |iControl SOAP|
|Management +------+--------------+----------+ | | |
| |6.x |6.0.0 - 6.1.0 |None | | | |
+------------+------+--------------+----------+----------+------+-------------+
|F5OS |1.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+------------+------+--------------+----------+----------+------+-------------+
|Traffix SDC |5.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+------------+------+--------------+----------+----------+------+-------------+
^1F5 only evaluates software versions that have not yet reached the End of
Technical Support (EoTS) phase of their lifecycle.
^2The CVSSv3 score link takes you to a resource outside of AskF5, and it is
possible that the document may be removed without our knowledge.
^3The fixed versions resolve this issue for token based authentication, however
HTTP basic authentication may expose this issue in a web browser. See the
Recommended actions for more details.
Recommended Actions
This attack cannot be prevented if a user has authenticated to iControl SOAP in
the web browser with basic authentication. This authentication mechanism is
uncommon and is not the same as using the login page for TMUI. F5 recommends
that users do not authenticate with basic authentication in the web browser. F5
recommends disabling basic authentication to iControl SOAP by changing the DB
variable httpd.basic_auth to disable. Also following the recommendations of
using an isolated web browser to mitigate this vulnerability. For more
information on disabling basic authentication, refer to K58092347: Disable
Basic Auth for iControl SOAP and iControl REST.
If you are running a version listed in the Versions known to be vulnerable
column, you can eliminate this vulnerability by upgrading to a version listed
in the Fixes introduced in column. If the table lists only an older version
than what you are currently running, or does not list a non-vulnerable version,
then no upgrade candidate currently exists.
Mitigation
To mitigate this vulnerability, you can use a unique and isolated web browser
when managing the BIG-IP or BIG-IQ system and restrict access to the iControl
API of the system to only trusted users.
For more information about limiting access to trusted users, refer to K17459:
Restricting access to the iControl SOAP API by source IP address.
Acknowledgements
This issue was discovered internally by F5.
Supplemental Information
o K41942608: Overview of security advisory articles
o K4602: Overview of the F5 security vulnerability response policy
o K4918: Overview of the F5 critical issue hotfix policy
o K9502: BIG-IP hotfix and point release matrix
o K13123: Managing BIG-IP product hotfixes (11.x - 16.x)
o K15106: Managing BIG-IQ product hotfixes
o K15113: BIG-IQ hotfix and point release matrix
o K167: Downloading software and firmware from F5
o K9970: Subscribing to email notifications regarding F5 products
o K9957: Creating a custom RSS feed to view new and updated documents
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