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AUSCERT External Security Bulletin Redistribution
ESB-2021.0810
F5 Products Multiple Vulnerabilities
8 March 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: BIG-IP
BIG-IQ
F5OS
Traffix SDC
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Mitigation
CVE Names: CVE-2020-8625
Reference: ESB-2021.0794
ESB-2021.0738
ESB-2021.0658
Original Bulletin:
https://support.f5.com/csp/article/K13591074
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K13591074: BIND vulnerability CVE-2020-8625
Original Publication Date: 05 Mar, 2021
Security Advisory Description
BIND servers are vulnerable if they are running an affected version and are
configured to use GSS-TSIG features. In a configuration which uses BIND's
default settings the vulnerable code path is not exposed, but a server can be
rendered vulnerable by explicitly setting valid values for the
tkey-gssapi-keytab or tkey-gssapi-credentialconfiguration options. Although the
default configuration is not vulnerable, GSS-TSIG is frequently used in
networks where BIND is integrated with Samba, as well as in mixed-server
environments that combine BIND servers with Active Directory domain
controllers. The most likely outcome of a successful exploitation of the
vulnerability is a crash of the named process. However, remote code execution,
while unproven, is theoretically possible. Affects: BIND 9.5.0 -> 9.11.27,
9.12.0 -> 9.16.11, and versions BIND 9.11.3-S1 -> 9.11.27-S1 and 9.16.8-S1 ->
9.16.11-S1 of BIND Supported Preview Edition. Also release versions 9.17.0 ->
9.17.1 of the BIND 9.17 development branch (CVE-2020-8625)
Impact
An attacker can exploit this vulnerability to cause the named process to be
terminated abnormally and resulting in a denial of service to the clients.
The BIND GSS-TSIG feature is enabled by default in the BIG-IP and BIG-IQ
systems running the affected versions, and they are vulnerable to this issue if
they are configured to use the GSS-TSIG features by setting valid values for
the tkey-gssapi-keytab or tkey-gssapi-credential configuration options.
Security Advisory Status
F5 Product Development has assigned ID 997173 (BIG-IP and BIG-IQ) 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, | |14.1.4 | | | | |
|ASM, DDHD, DNS, +------+----------+----------+High |8.1 |BIND |
|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 | | | | |
+-------------------+------+----------+----------+----------+------+----------+
| |8.x |8.0.0 |None | | | |
| +------+----------+----------+ | | |
|BIG-IQ Centralized |7.x |7.0.0 - |None | | | |
|Management | |7.1.0 | |High |8.1 |BIND |
| +------+----------+----------+ | | |
| |6.x |6.0.0 - |None | | | |
| | |6.1.0 | | | | |
+-------------------+------+----------+----------+----------+------+----------+
|F5OS |1.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+-------------------+------+----------+----------+----------+------+----------+
|Traffix SDC |5.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+-------------------+------+----------+----------+----------+------+----------+
The 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 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
None. To avoid this vulnerability, do not use the GSS-TSIG features even though
it is enabled by default on the affected products and versions.
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 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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You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
https://www.auscert.org.au/bulletins/
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
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