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AUSCERT External Security Bulletin Redistribution
ESB-2023.0647
K37708118: BIG-IP DNS profile vulnerability CVE-2023-22839
6 February 2023
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: F5 BIG-IP (DNS, LTM enabled with DNS Services license)
Publisher: F5 Networks
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2023-22839
Original Bulletin:
https://my.f5.com/manage/s/article/K37708118
Comment: CVSS (Max): 7.5 CVE-2023-22839 (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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K37708118: BIG-IP DNS profile vulnerability CVE-2023-22839
Published Date: Feb 1, 2023
Updated Date: Feb 2, 2023
Final- This article is marked as 'Final' because the security issue described
in this article either affected F5 products at one time and was resolved or it
never affected F5 products. Unless new information is discovered, F5 will no
longer update the article.
Security Advisory Description
When a DNS profile with the Rapid Response Mode setting enabled is configured
on a virtual server with hardware SYN cookies enabled, undisclosed requests
cause the Traffic Management Microkernel (TMM) to terminate. (CVE-2023-22839)
Impact
Traffic is disrupted while the TMM process restarts. This vulnerability allows
a remote unauthenticated attacker to cause a denial-of-service (DoS) on the
BIG-IP system. There is no control plane exposure; this is a data plane issue
only.
o BIG-IP
? BIG-IP 5000 series (C109)
BIG-IP 7000 series (D110)
BIG-IP 10000 series (D113)
BIG-IP 12000 series (D111)
o BIG-IP iSeries
? BIG-IP i5600, i5800 (C119)
BIG-IP i7600, i7800 (C118)
BIG-IP i10600, i10800 (C116)
BIG-IP i11600, i11800 (C123)
BIG-IP i15600, i15800 (D116)
o F5 rSeries
? r5000
? r10000
o F5 VELOS BX110 blade
o VIPRION B2100/2150 blade (A109, A113)
o VIPRION B2250 blade (A112)
o VIPRION B4300 series blade (A108, A110)
o VIPRION B4450 series blade
Security Advisory Status
F5 Product Development has assigned ID 1107437 (BIG-IP) this vulnerability.
This issue has been classified as CWE-476: NULL Pointer Dereference.
To determine if your product and version have been evaluated for this
vulnerability, refer to the Evaluated products 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
o Services
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 |Fixes | |CVSSv3|Vulnerable |
|Product |Branch|known to be|introduced|Severity |score^|component or |
| | |vulnerable^|in | |2 |feature |
| | |1 | | | | |
+---------------+------+-----------+----------+----------+------+-------------+
| |17.x |17.0.0 |17.0.0.2 | | | |
| +------+-----------+----------+ | | |
| |16.x |16.1.0 - |16.1.3.3 | | | |
| | |16.1.3 | | | | |
|BIG-IP (DNS, +------+-----------+----------+ | |DNS profile |
|LTM enabled |15.x |15.1.0 - |15.1.8.1 | | |with Rapid |
|with DNS | |15.1.8 | |High |7.5 |Response mode|
|Services +------+-----------+----------+ | |enabled |
|license^3) |14.x |14.1.0 - |14.1.5.3 | | | |
| | |14.1.5 | | | | |
| +------+-----------+----------+ | | |
| |13.x |13.1.0 - |Will not | | | |
| | |13.1.5 |fix | | | |
+---------------+------+-----------+----------+----------+------+-------------+
|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 MyF5, and it is
possible that the document may be removed without our knowledge.
^3For more information about the DNS Services license, refer to K06264781: DNS
module is showing as "Unlicensed" in the provisioning page.
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 MyF5, 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 MyF5, 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 MyF5, and it is
possible that the document may be removed without our knowledge.
Services
+-----------------------------+------------------------------------+
|Service |Status |
+-----------------------------+------------------------------------+
|F5 Distributed Cloud Services|Does not affect or has been resolved|
+-----------------------------+------------------------------------+
|Silverline |Does not affect or has been resolved|
+-----------------------------+------------------------------------+
|Threat Stack |Does not affect or has been resolved|
+-----------------------------+------------------------------------+
Security Advisory 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 that you upgrade to a version with the fix (refer to
the tables).
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
To mitigate this vulnerability, you can disable hardware SYN cookie and reboot
the system. To do so, perform the following procedure:
Impact of procedure: This procedure may increase the CPU usage of the BIG-IP
system.
1. Log in to the TMOS Shell (tmsh) by typing the following command:
tmsh
2. Type the following command:
modify sys db pvasyncookies.enabled value false
3. Reboot the system by typing the following command:
reboot
For VIPRION systems, reboot all the blades by typing the following command:
clsh shutdown -r now
Acknowledgements
This issue was discovered internally by F5.
Related Content
o K41942608: Overview of security advisory articles
o K12201527: Overview of Quarterly Security Notifications
o K51812227: Understanding security advisory versioning
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 K167: Downloading software and firmware from F5
o K9970: Subscribing to email notifications regarding F5 products
o K9957: RSS feed service interruption
o K44525501: Overview of BIG-IP data plane and control plane
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The University of Queensland
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Qld 4072
Internet Email: auscert@auscert.org.au
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