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AUSCERT External Security Bulletin Redistribution
ESB-2021.0435
K62532228: Linux kernel CVE-2020-10769
9 February 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: F5 BIG-IP Products
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Denial of Service -- Existing Account
Resolution: Mitigation
CVE Names: CVE-2020-10769
Reference: ESB-2020.4406
ESB-2020.3063
ESB-2020.3043
ESB-2020.2907
Original Bulletin:
https://support.f5.com/csp/article/K62532228
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K62532228: Linux kernel CVE-2020-10769
Original Publication Date: 09 Feb, 2021
Security Advisory Description
A buffer over-read flaw was found in RH kernel versions before 5.0 in
crypto_authenc_extractkeys in crypto/authenc.c in the IPsec Cryptographic
algorithm's module, authenc. When a payload longer than 4 bytes, and is not
following 4-byte alignment boundary guidelines, it causes a buffer over-read
threat, leading to a system crash. This flaw allows a local attacker with user
privileges to cause a denial of service. (CVE-2020-10769)
Impact
This vulnerability allows a local attacker with user privileges to cause a
denial-of-service (DoS) attack.
Security Advisory Status
F5 Product Development has assigned ID 987749 (BIG-IP) 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.
+-------------------+------+----------+----------+----------+------+----------+
| | |Versions |Fixes | |CVSSv3|Vulnerable|
|Product |Branch|known to |introduced|Severity |score^|component |
| | |be |in | |1 |or feature|
| | |vulnerable| | | | |
+-------------------+------+----------+----------+----------+------+----------+
| |16.x |16.0.0 - |None | | | |
| | |16.0.1 | | | | |
| +------+----------+----------+ | | |
| |15.x |15.1.0 - |None | | | |
| | |15.1.2 | | | | |
|BIG-IP (LTM, AAM, +------+----------+----------+ | | |
|Advanced WAF, AFM, |14.x |14.1.0 - |None | | | |
|Analytics, APM, | |14.1.3 | | | |Linux |
|ASM, DDHD, DNS, +------+----------+----------+Medium |5.5 |kernel |
|FPS, GTM, Link |13.x |13.1.0 - |None | | | |
|Controller, PEM, | |13.1.3 | | | | |
|SSLO) +------+----------+----------+ | | |
| |12.x |12.1.0 - |None | | | |
| | |12.1.5 | | | | |
| +------+----------+----------+ | | |
| |11.x |11.6.1 - |None | | | |
| | |11.6.5 | | | | |
+-------------------+------+----------+----------+----------+------+----------+
| |7.x |None |Not | | | |
|BIG-IQ Centralized | | |applicable|Not | | |
|Management +------+----------+----------+vulnerable|None |None |
| |6.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
|F5OS |1.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+-------------------+------+----------+----------+----------+------+----------+
|Traffix SDC |5.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+-------------------+------+----------+----------+----------+------+----------+
^1The CVSSv3 score link takes you to a resource outside of AskF5, and it is
possible that the document may be removed without our knowledge.
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 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 reduce the risk of an attacker exploiting this vulnerability, permit
management access to F5 products 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.
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 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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