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AUSCERT External Security Bulletin Redistribution
ESB-2020.3587
Linux kernel vulnerability CVE-2019-3900
20 October 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Linux kernel
Publisher: F5 Networks
Operating System: Linux variants
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-3900
Reference: ESB-2019.2869
Original Bulletin:
https://support.f5.com/csp/article/K04107324
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K04107324:Linux kernel vulnerability CVE-2019-3900
Security Advisory
Original Publication Date: 20 Oct, 2020
Security Advisory Description
An infinite loop issue was found in the vhost_net kernel module in Linux Kernel
up to and including v5.1-rc6, while handling incoming packets in handle_rx().
It could occur if one end sends packets faster than the other end can process
them. A guest user, maybe remote one, could use this flaw to stall the
vhost_net kernel thread, resulting in a DoS scenario. (CVE-2019-3900)
Impact
An attacker may cause a denial-of-service (DoS) that results in a traffic
disruption. This issue only affects BIG-IP platforms with Virtual Clustered
Multiprocessing (vCMP) guests. This issue does not affect BIG-IP Virtual
Edition (VE) or single-instance appliances. BIG-IP vCMP systems are vulnerable
regardless of their configuration or deployed modules.
Security Advisory Status
F5 Product Development has assigned ID 949889 (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 | | | |
| +------+----------+----------+ | | |
| |15.x |15.1.0 - |None | | | |
| | |15.1.1 | | | | |
|BIG-IP (LTM, AAM, +------+----------+----------+ | | |
|Advanced WAF, AFM, |14.x |14.1.0 - |None | | | |
|Analytics, APM, | |14.1.2 | | | |vCMP / |
|ASM, DDHD, DNS, +------+----------+----------+Medium |6.3 |Linux |
|FPS, GTM, Link |13.x |13.1.0 - |None | | |kernel |
|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 |7.0.0 - |None | | | |
| | |7.1.0 | | | | |
|BIG-IQ Centralized +------+----------+----------+ | |vCMP / |
|Management |6.x |6.0.0 - |None |Medium |6.3 |Linux |
| | |6.1.0 | | | |kernel |
| +------+----------+----------+ | | |
| |5.x |5.4.0 |None | | | |
+-------------------+------+----------+----------+----------+------+----------+
|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 K15106: Managing BIG-IQ product hotfixes
o K15113: BIG-IQ hotfix and point release matrix
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
o K14218: vCMP guest memory/CPU core allocation matrix
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You have received this e-mail bulletin as a result of your organisation's
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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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