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AUSCERT External Security Bulletin Redistribution
ESB-2019.4349
Linux kernel KVM subsystem vulnerability CVE-2019-6974
18 November 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: F5 BIG-IP products
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Increased Privileges -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-6974
Reference: ESB-2019.1800
ESB-2019.1793
ESB-2019.1389
ESB-2019.1387
ESB-2019.1127
Original Bulletin:
https://support.f5.com/csp/article/K11186236
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K11186236:Linux kernel KVM subsystem vulnerability CVE-2019-6974
Security Advisory
Original Publication Date: 20 Apr, 2019
Latest Publication Date: 15 Nov, 2019
Security Advisory Description
In the Linux kernel before 4.20.8, kvm_ioctl_create_device in virt/kvm/
kvm_main.c mishandles reference counting because of a race condition, leading
to a use-after-free. (CVE-2019-6974)
Impact
BIG-IP
An attacker may use this vulnerability to cause a vCMP guest to
crash, resulting in a denial-of-service or gain privileged access to the vCMP
hypervisor host system. This vulnerability affects only hardware platforms that
are vCMP-capable and are provisioned for vCMP. For a list of vCMP capable
hardware platforms, refer to K14088: vCMP host and compatible guest version
matrix.
BIG-IQ, Enterprise Manager, F5 iWorkflow, Traffix SDC
There is no impact; these F5 products are not affected by this vulnerability.
Security Advisory Status
F5 Product Development has assigned ID 769589 (BIG-IP) to this vulnerability.
Additionally, BIG-IP iHealth may list Heuristic H11186236 on the Diagnostics >
Identified > High page.
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 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| | | | |
+-------------------+------+----------+----------+----------+------+----------+
| |14.x |14.0.0 - |None | | | |
| | |14.1.0 | | | | |
|BIG-IP (LTM, AAM, +------+----------+----------+ | | |
|AFM, Analytics, |13.x |13.0.0 - |13.1.3.2 | | | |
|APM, ASM, DNS, Edge| |13.1.3 | | | |vCMP guest|
|Gateway, FPS, GTM, +------+----------+----------+High |7.8 |and host |
|Link Controller, |12.x |None |Not | | | |
|PEM, | | |applicable| | | |
|WebAccelerator) +------+----------+----------+ | | |
| |11.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
|Enterprise Manager |3.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+-------------------+------+----------+----------+----------+------+----------+
| |6.x |None |Not | | | |
|BIG-IQ Centralized | | |applicable|Not | | |
|Management +------+----------+----------+vulnerable|None |None |
| |5.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
|F5 iWorkflow |2.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 mitigate this vulnerability, you should restrict privileged access for
affected systems to trusted users. For more information, refer to K13092:
Overview of securing access to the BIG-IP system.
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 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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