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AUSCERT External Security Bulletin Redistribution
ESB-2022.1417
K44994972: Linux kernel vulnerability CVE-2020-25704
1 April 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: F5 BIG-IP
F5 BIG-IQ Centralized Management
F5OS-A
F5OS-C
Publisher: F5 Networks
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2020-25704
Original Bulletin:
https://support.f5.com/csp/article/K44994972
Comment: CVSS (Max): 6.2 CVE-2021-41496 (CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
CVSS Source: F5
Calculator: https://first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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K44994972: Linux kernel vulnerability CVE-2020-25704
Original Publication Date: 01 Apr, 2022
Security Advisory Description
A flaw memory leak in the Linux kernel performance monitoring subsystem was
found in the way if using PERF_EVENT_IOC_SET_FILTER. A local user could use
this flaw to starve the resources causing denial of service. (CVE-2020-25704)
Impact
This vulnerability may allow a locally authenticated user to exhaust system
resources causing a denial-of-service (DoS).
Security Advisory Status
F5 Product Development has assigned IDs 1091517 (BIG-IP), 1091517-9 (BIG-IQ),
1091677 (F5OS-C), and 1091681 (F5OS-A) 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 |16.1.0 - |None | | | |
| | |16.1.2 | | | | |
| +------+--------------+----------+ | | |
| |15.x |15.1.0 - |None | | | |
| | |15.1.5 | | | | |
| +------+--------------+----------+ | | |
| |14.x |14.1.0 - |None | | | |
|BIG-IP (all | |14.1.4 | | | | |
|modules) +------+--------------+----------+Medium |6.2 |Linux kernel |
| |13.x |13.1.0 - |None | | | |
| | |13.1.4 | | | | |
| +------+--------------+----------+ | | |
| |12.x |12.1.0 - |None | | | |
| | |12.1.6 | | | | |
| +------+--------------+----------+ | | |
| |11.x |11.6.1 - |None | | | |
| | |11.6.5 | | | | |
+------------+------+--------------+----------+----------+------+-------------+
|BIG-IQ |8.x |8.0.0 - 8.1.0 |None | | | |
|Centralized +------+--------------+----------+Medium |6.2 |Linux kernel |
|Management |7.x |7.0.0 - 7.1.0 |None | | | |
+------------+------+--------------+----------+----------+------+-------------+
|F5OS-A |1.x |1.0.0 - 1.0.1 |None |Medium |6.2 |Linux kernel |
+------------+------+--------------+----------+----------+------+-------------+
| | |1.3.0 - 1.3.1 | | | | |
|F5OS-C |1.x |1.2.0 - 1.2.2 |None |Medium |6.2 |Linux kernel |
| | |1.1.0 - 1.1.4 | | | | |
+------------+------+--------------+----------+----------+------+-------------+
|Traffix SDC |5.x |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.
^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
To mitigate this vulnerability for the BIG-IP and BIG-IQ systems, you should
permit access to the Advanced Shell (bash) only over a secure network and limit
access to only trusted users. For more information about securing access to
BIG-IP systems, refer to K13092: Overview of securing access to the BIG-IP
system.
To mitigate this vulnerability for F5OS, you should restrict CLI access to the
root user.
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 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 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
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