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AUSCERT External Security Bulletin Redistribution
ESB-2020.4489
BIG-IP Product vulnerabilities (CVE-2020-27721, CVE-2020-27717)
18 December 2020
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: BIG-IP Products
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-27721 CVE-2020-27717
Original Bulletin:
https://support.f5.com/csp/article/K52035247
https://support.f5.com/csp/article/K43850230
Comment: This bulletin contains two (2) F5 Networks security advisories.
- --------------------------BEGIN INCLUDED TEXT--------------------
K52035247: BIG-IP DNS virtual server vulnerability CVE-2020-27721
Original Publication Date: 17 Dec, 2020
Security Advisory Description
In a BIG-IP DNS / BIG-IP LTM GSLB deployment, under certain circumstances, the
BIG-IP DNS system may stop using a BIG-IP LTM virtual server for DNS response.
(CVE-2020-27721)
This can occur under the following conditions:
o You configure connection rate limiting by either source or destination
address for a BIG-IP LTM virtual server.
o The configured connection rate limit is exceeded on the BIG-IP LTM virtual
server (or Pool Member or Node), and the status of the virtual server on
the Configuration utility becomes yellow.
Impact
An attacker can exploit this vulnerability to cause the BIG-IP LTM virtual
server to be marked as unavailable (yellow on the Configuration utility)
resulting in a denial of DNS service (DoS) for all clients of the virtual
server.
Security Advisory Status
F5 Product Development has assigned ID 693360 and ID 751036 (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 |16.0.1 | | | |
| +------+----------+----------+ | | |
| |15.x |15.0.0 - |15.1.2 | | | |
| | |15.1.1 | | | | |
| +------+----------+----------+ | | |
| |14.x |14.1.0 - |14.1.3.1 | | |BIG-IP DNS|
|BIG-IP (DNS, GTM) | |14.1.3 | | | |wide IP |
| +------+----------+----------+Medium |5.9 |and |
| |13.x |13.1.0 - |None | | |BIG-IP LTM|
| | |13.1.3 | | | |virtual |
| +------+----------+----------+ | |server |
| |12.x |12.1.0 - |None | | | |
| | |12.1.5 | | | | |
| +------+----------+----------+ | | |
| |11.x |11.6.1 - |None | | | |
| | |11.6.5 | | | | |
+-------------------+------+----------+----------+----------+------+----------+
| |16.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |15.x |None |Not | | | |
| | | |applicable| | | |
|BIG-IP (LTM, AAM, +------+----------+----------+ | | |
|Advanced WAF, AFM, |14.x |None |Not | | | |
|Analytics, APM, | | |applicable|Not | | |
|ASM, DDHD, FPS, +------+----------+----------+vulnerable|None |None |
|Link Controller, |13.x |None |Not | | | |
|PEM, SSLO) | | |applicable| | | |
| +------+----------+----------+ | | |
| |12.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |11.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
| |7.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
|BIG-IQ Centralized |6.x |None |Not |Not |None |None |
|Management | | |applicable|vulnerable| | |
| +------+----------+----------+ | | |
| |5.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
|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 mitigate this vulnerability, you can configure the BIG-IP virtual server to
not rate limit connections by source or destination addresses.
Note: For more information on Connection Rate Limits of a virtual server, refer
to K93017176: Overview of the Standard virtual server and K45530602: Limiting
the number of connections to a Virtual Server.
Impact of action: The system will not apply rate limiting to the affected
virtual server by way of either source or destination addresses.
To do so perform the following procedure:
1. Log in to the Configuration utility.
2. Go to Local Traffic > Virtual Servers > Virtual Server List.
3. Select the affected virtual server.
4. For Configuration select Advanced.
5. To mitigate this vulnerability, perform either of the following:
Set the Connection Rate Limit value to 0.
For Connection Rate Limit Mode, select Per Virtual Server.
6. Click Update.
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
- -----------------------------------------------------------------------------
K43850230: BIG-IP DNS vulnerability CVE-2020-27717
Original Publication Date: 17 Dec, 2020
Security Advisory Description
Undisclosed series of DNS requests may cause TMM to restart and generate a core
file. (CVE-2020-27717)
Impact
This vulnerability causes a denial-of-service (DoS) in data plane traffic. The
affected BIG-IP system temporarily fails to process traffic as it recovers from
a Traffic Management Microkernel (TMM) restart, and devices configured in a
device group may fail over. This vulnerability does not apply to the control
plane.
Security Advisory Status
F5 Product Development has assigned ID 908673 (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 |16.0.1 | | | |
| +------+----------+----------+ | | |
| |15.x |15.1.0 |15.1.1 | | | |
| +------+----------+----------+ | | |
| |14.x |14.1.0 - |14.1.3.1 | | | |
| | |14.1.3 | | | | |
|BIG-IP (DNS) +------+----------+----------+ | |DNS |
| |13.x |13.1.0 - |13.1.3.5 |High |7.5 |virtual |
| | |13.1.3 | | | |server |
| +------+----------+----------+ | | |
| |12.x |12.1.0 - |None | | | |
| | |12.1.5 | | | | |
| +------+----------+----------+ | | |
| |11.x |11.6.1 - |None | | | |
| | |11.6.5 | | | | |
+-------------------+------+----------+----------+----------+------+----------+
| |16.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |15.x |None |Not | | | |
| | | |applicable| | | |
|BIG-IP (LTM, AAM, +------+----------+----------+ | | |
|Advanced WAF, AFM, |14.x |None |Not | | | |
|Analytics, APM, | | |applicable|Not | | |
|ASM, DDHD, FPS, +------+----------+----------+vulnerable|None |None |
|GTM, Link |13.x |None |Not | | | |
|Controller, PEM, | | |applicable| | | |
|SSLO) +------+----------+----------+ | | |
| |12.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |11.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
| |7.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
|BIG-IQ Centralized |6.x |None |Not |Not |None |None |
|Management | | |applicable|vulnerable| | |
| +------+----------+----------+ | | |
| |5.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
|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
None
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
- --------------------------END INCLUDED TEXT--------------------
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