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AUSCERT External Security Bulletin Redistribution
ESB-2020.2925
BIG-IP APM vulnerability CVE-2020-5919
26 August 2020
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: BIG-IP APM
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-5919
Original Bulletin:
https://support.f5.com/csp/article/K94563369
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K94563369:BIG-IP APM vulnerability CVE-2020-5919
Security Advisory
Original Publication Date: 26 Aug, 2020
Security Advisory Description
Rendering of certain session variables by BIG-IP APM UI-based agents in
an access profile configured with Modern customization, may cause the Traffic
Management Microkernel (TMM) to stop responding. (CVE-2020-5919)
Impact
TMM may generate a core file and restart, causing traffic disruption or a
failover event.
Security Advisory Status
F5 Product Development has assigned ID 902141 (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 |None |16.0.0 | | | |
| +------+----------+----------+ | | |
| |15.x |15.1.0 |15.1.0.5 | | | |
| +------+----------+----------+ | | |
| |14.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | |BIG-IP APM|
|BIG-IP (APM) |13.x |None |Not |Medium |6.3 |access |
| | | |applicable| | |profile |
| +------+----------+----------+ | | |
| |12.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |11.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
| |15.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |14.x |None |Not | | | |
|BIG-IP (LTM, AAM, | | |applicable| | | |
|AFM, Analytics, +------+----------+----------+ | | |
|ASM, DNS, FPS, GTM,|13.x |None |Not |Not |None |None |
|Link Controller, | | |applicable|vulnerable| | |
|PEM) +------+----------+----------+ | | |
| |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 avoid using Modern customization when
creating your BIG-IP APM access profile. To do so, perform the following
procedure:
Impact of action: Performing the following procedure should not have a negative
impact on your system.
1. Log in to the Configuration utility.
2. Go to Access > Profiles / Policies > Access Profiles (Per-Session Policies)
.
3. Select Create.
4. For Customization Type, select Standard.
5. Enter a name, select a profile type, and complete other required settings.
6. Select Finished.
Supplemental Information
o K51812227: Understanding Security Advisory versioning
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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===========================================================================
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