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AUSCERT External Security Bulletin Redistribution
ESB-2022.5230
K43024307: BIG-IP iRules vulnerability CVE-2022-41624
20 October 2022
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: BIG-IP
Publisher: F5 Networks
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2022-41624
Original Bulletin:
https://support.f5.com/csp/article/K43024307
Comment: CVSS (Max): 7.5 CVE-2021-41624 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
CVSS Source: F5 Networks
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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K43024307: BIG-IP iRules vulnerability CVE-2022-41624
Original Publication Date: 19 Oct, 2022
Security Advisory Description
When a sideband iRule is configured on a virtual server, undisclosed traffic
can cause an increase in memory resource utilization. (CVE-2022-41624)
Impact
System performance can degrade until the Traffic Management Microkernel (TMM)
process is either forced to restart or is manually restarted. This
vulnerability allows a remote, unauthenticated attacker to cause a degradation
of service that can lead to a resource consumption type denial-of-service (DoS)
on the BIG-IP system. There is no control plane exposure; this is a data plane
issue only.
For more information, refer to Sideband iRules on F5 CloudDocs.
Security Advisory Status
F5 Product Development has assigned ID1106289 (BIG-IP) to this vulnerability.
This issue has been classified as CWE-401: Missing Release of Memory after
Effective Lifetime.
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 tables. You can
also use iHealth to diagnose a vulnerability for BIG-IP and BIG-IQ systems. For
more information about using iHealth, refer to K27404821: Using F5 iHealth to
diagnose vulnerabilities. For more information about security advisory
versioning, refer to K51812227: Understanding security advisory versioning.
In this section
o BIG-IP and BIG-IQ
o F5OS
o NGINX
o Other products
BIG-IP and BIG-IQ
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.
+------------+------+--------------+----------+----------+------+-------------+
| | |Versions known|Fixes | |CVSSv3|Vulnerable |
|Product |Branch|to be |introduced|Severity |score^|component or |
| | |vulnerable^1 |in | |2 |feature |
+------------+------+--------------+----------+----------+------+-------------+
| |17.x |17.0.0 |17.0.0.1 | | | |
| +------+--------------+----------+ | | |
| |16.x |16.1.0 - |16.1.3.2 | | | |
| | |16.1.3 | | | | |
| +------+--------------+----------+ | | |
|BIG-IP (all |15.x |15.1.0 - |15.1.7 | | | |
|modules) | |15.1.6 | |High |7.5 |iRules |
| +------+--------------+----------+ | | |
| |14.x |14.1.0 - |14.1.5.2 | | | |
| | |14.1.5 | | | | |
| +------+--------------+----------+ | | |
| |13.x |13.1.0 - |13.1.5.1 | | | |
| | |13.1.5 | | | | |
+------------+------+--------------+----------+----------+------+-------------+
|BIG-IP SPK |All |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+------------+------+--------------+----------+----------+------+-------------+
|BIG-IQ | | |Not |Not | | |
|Centralized |All |None |applicable|vulnerable|None |None |
|Management | | | | | | |
+------------+------+--------------+----------+----------+------+-------------+
^1F5 evaluates only software versions that have not yet reached the End of
Technical Support (EoTS) phase of their lifecycle. For more information, refer
to the Security hotfixes section of K4602: Overview of the F5 security
vulnerability response policy.
^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.
F5OS
+-------+------+----------------+----------+----------+-------+---------------+
| | |Versions known |Fixes | |CVSSv3 |Vulnerable |
|Product|Branch|to be vulnerable|introduced|Severity |score^2|component or |
| | |^1 |in | | |feature |
+-------+------+----------------+----------+----------+-------+---------------+
|F5OS-A |All |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+-------+------+----------------+----------+----------+-------+---------------+
|F5OS-C |All |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+-------+------+----------------+----------+----------+-------+---------------+
^1F5 evaluates only software versions that have not yet reached the End of
Technical Support (EoTS) phase of their lifecycle. For more information, refer
to the Security hotfixes section of K4602: Overview of the F5 security
vulnerability response policy.
^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.
NGINX
+---------+------+---------------+----------+----------+------+---------------+
| | |Versions known |Fixes | |CVSSv3|Vulnerable |
|Product |Branch|to be |introduced|Severity |score^|component or |
| | |vulnerable^1 |in | |2 |feature |
+---------+------+---------------+----------+----------+------+---------------+
|NGINX | | |Not |Not | | |
|(all |All |None |applicable|vulnerable|None |None |
|products)| | | | | | |
+---------+------+---------------+----------+----------+------+---------------+
^1F5 evaluates only software versions that have not yet reached the End of
Technical Support (EoTS) phase of their lifecycle. For more information, refer
to the Security hotfixes section of K4602: Overview of the F5 security
vulnerability response policy.
^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.
Other products
+-------+------+----------------+----------+----------+-------+---------------+
| | |Versions known |Fixes | |CVSSv3 |Vulnerable |
|Product|Branch|to be vulnerable|introduced|Severity |score^2|component or |
| | |^1 |in | | |feature |
+-------+------+----------------+----------+----------+-------+---------------+
|Traffix|All |None |Not |Not |None |None |
|SDC | | |applicable|vulnerable| | |
+-------+------+----------------+----------+----------+-------+---------------+
^1F5 evaluates only software versions that have not yet reached the End of
Technical Support (EoTS) phase of their lifecycle. For more information, refer
to the Security hotfixes section of K4602: Overview of the F5 security
vulnerability response policy.
^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.
Recommended Actions
If you are running a version listed in the Versions known to be vulnerable
column, you can eliminate this vulnerability by installing a version listed in
the Fixes introduced in column. If the Fixes introduced in column does not list
a version for your branch, then no update candidate currently exists for that
branch and F5 recommends upgrading to a version with the fix (refer to the
table).
If the Fixes introduced in column lists a version prior to the one you are
running, in the same branch, then your version should have the fix.
Mitigation
F5 recommends you configure the BIG-IP systems with high availability (HA) to
lessen the impact of the vulnerability.
o Configure systems with HA clustering. For more information, refer to
K02234544: Manually setting up device service clustering.
o Configure the HA table to take specific actions. For more information,
refer to K9231: Overview of BIG-IP daemon heartbeat failsafe.
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 K8986: F5 product support policies
o K9502: BIG-IP hotfix and point release matrix
o K13123: Managing BIG-IP product hotfixes (11.x - 17.x)
o K48955220: Installing an OPSWAT Endpoint Security update on BIG-IP APM
systems (11.4.x and later)
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
o K44525501: Overview of BIG-IP data plane and control plane
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