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AUSCERT External Security Bulletin Redistribution
ESB-2021.3985
K20072454: Linux kernel vulnerability CVE-2021-43267
24 November 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Traffix SDC
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Modify Arbitrary Files -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Mitigation
CVE Names: CVE-2021-43267
Reference: ESB-2021.3897
ESB-2021.3889
Original Bulletin:
https://support.f5.com/csp/article/K20072454
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K20072454: Linux kernel vulnerability CVE-2021-43267
Original Publication Date: 24 Nov, 2021
Security Advisory Description
An issue was discovered in net/tipc/crypto.c in the Linux kernel before
5.14.16. The Transparent Inter-Process Communication (TIPC) functionality
allows remote attackers to exploit insufficient validation of user-supplied
sizes for the MSG_CRYPTO message type. (CVE-2021-43267)
Impact
An attacker can exploit the vulnerability to access restricted information,
modify files, or cause a denial-of-service (DoS) attack.
Security Advisory Status
F5 Product Development has assigned SDC-1485 (Traffix) 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 Applies to (see versions) box of this
article 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 |None |Not | | | |
| | | |applicable| | | |
| +------+--------------+----------+ | | |
| |15.x |None |Not | | | |
| | | |applicable| | | |
| +------+--------------+----------+ | | |
| |14.x |None |Not | | | |
|BIG-IP (all | | |applicable|Not | | |
|modules) +------+--------------+----------+vulnerable|None |None |
| |13.x |None |Not | | | |
| | | |applicable| | | |
| +------+--------------+----------+ | | |
| |12.x |None |Not | | | |
| | | |applicable| | | |
| +------+--------------+----------+ | | |
| |11.x |None |Not | | | |
| | | |applicable| | | |
+------------+------+--------------+----------+----------+------+-------------+
| |8.x |None |Not | | | |
| | | |applicable| | | |
|BIG-IQ +------+--------------+----------+ | | |
|Centralized |7.x |None |Not |Not |None |None |
|Management | | |applicable|vulnerable| | |
| +------+--------------+----------+ | | |
| |6.x |None |Not | | | |
| | | |applicable| | | |
+------------+------+--------------+----------+----------+------+-------------+
|F5OS |1.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+------------+------+--------------+----------+----------+------+-------------+
|Traffix SDC |5.x |5.2.0 |None |High |8.1 |Linux kernel |
| | | | | | |(TIPC module)|
+------------+------+--------------+----------+----------+------+-------------+
^1F5 evaluates only 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.
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
Traffix SDC does not require the TIPC module to run in order to function
properly and does not load the TIPC module by default.
As a preventive measure, you can run the following command on the affected
Traffix system command line to prevent the TIPC module from loading.
Impact of action: Performing the following procedure should not have a negative
impact on your system.
1. Log in to the Traffix SDC command line.
2. Run the following command to prevent the TIPC module from loading:
echo "install tipc /bin/true" >> /etc/modprobe.d/disable-tipc.conf
Note: If the TIPC module is already loaded, you must restart the system to
unload it.
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 software lifecycle policy
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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