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===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2019.4767.2
TMM vulnerability CVE-2019-6676
11 February 2020
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: F5 BIG-IP
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-6676
Original Bulletin:
https://support.f5.com/csp/article/K92002212
https://support.f5.com/csp/article/K06747393
https://support.f5.com/csp/article/K95117754
Comment: This bulletin contains three (3) F5 Networks security advisories.
Revision History: February 11 2020: Updated Security Advisory Status table
[K95117754, K06747393]
December 23 2019: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
K92002212:TMM vulnerability CVE-2019-6676
Security Advisory
Original Publication Date: 21 Dec, 2019
Security Advisory Description
Traffic Management Microkernel (TMM) may restart on BIG-IP Virtual Edition (VE)
when using virtio direct descriptors and packets 2 KB or larger. (CVE-2019-6676
)
Impact
Some virtio backend implementations send large packets (2 KB or larger) even
when Large Offload Receive (LRO) is disabled. If the backend uses direct
descriptors, this combination might cause Traffic Management Microkernel (TMM)
to generate a core file and restart. The standard KVM implementation of virtio
does not have this behavior.
This issue affects only BIG-IP VE systems. BIG-IP hardware platforms do not use
the virtio subsystem.
Security Advisory Status
F5 Product Development has assigned ID 757357 (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| | | | |
+-------------------+------+----------+----------+----------+------+----------+
| |15.x |15.0.0 - |15.1.0 | | | |
| | |15.0.1 |15.0.1.1 | | | |
| +------+----------+----------+ | | |
|BIG-IP (LTM, AAM, |14.x |14.0.0 - |14.1.2.3 | | | |
|AFM, Analytics, | |14.1.2 | | | | |
|APM, ASM, DNS, Edge+------+----------+----------+ | | |
|Gateway, FPS, GTM, |13.x |13.1.0 - |13.1.3.2 |High |7.5 |TMM |
|Link Controller, | |13.1.3 | | | | |
|PEM, +------+----------+----------+ | | |
|WebAccelerator) |12.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |11.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
|Enterprise Manager |3.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+-------------------+------+----------+----------+----------+------+----------+
| |7.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
|BIG-IQ Centralized |6.x |None |Not |Not |None |None |
|Management | | |applicable|vulnerable| | |
| +------+----------+----------+ | | |
| |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 can switch to the unic or sock driver,
depending on the version. To do so, perform the following procedure:
Impact of action: Performing the following procedure causes a traffic
disruption while TMM restarts and may have a performance impact depending on
the level of traffic.
1. Log in to the Advanced Shell (bash).
2. Using a text editor such as vi, open the /config/tmm_init.tcl file for
editing.
3. Add the following line to the file depending on the version:
14.1.0 and later
device driver vendor_dev 1d0f:ec20 sock
13.1.0 - 14.0.x
device driver vendor_dev 1af4:1000 unic
4. Save the changes and exit the editor.
5. Restart tmm using the following command:
tmsh restart /sys service tmm
Note: You may need to manually remove the previously-mentioned line from /
config/tmm_init.tcl after upgrading the BIG-IP system. To remove the line,
repeat the procedure and delete the line before saving the file and restarting
TMM.
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 - 15.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
============================================================================
K06747393:TMM vulnerability CVE-2019-6677
Security Advisory
Original Publication Date: 21 Dec, 2019
Latest Publication Date: 11 Feb, 2020
Security Advisory Description
Under certain conditions, when using custom TCP congestion control settings in
a TCP profile, TMM stops processing traffic when processed by an iRule. (CVE-
2019-6677)
Impact
The Traffic Management Microkernel (TMM) may generate a core file and restart,
causing a traffic disruption or failover event. This only impacts the data
plane under specific, non-default configurations. There is no control plane
exposure.
Security Advisory Status
F5 Product Development has assigned ID 795437 (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| | | | |
+-------------------+------+----------+----------+----------+------+----------+
| |15.x |15.0.0 - |15.1.0 | | | |
| | |15.0.1 |15.0.1.1 | | | |
| +------+----------+----------+ | | |
| | |14.1.0 - | | | | |
| |14.x |14.1.2 |14.1.2.1 | | | |
|BIG-IP (LTM, AAM, | |14.0.0 - |14.0.1.1 | | | |
|AFM, Analytics, | |14.0.1 | | | | |
|APM, ASM, DNS, FPS,+------+----------+----------+High |7.5 |TMM |
|GTM, Link |13.x |13.1.0 - |13.1.3.2 | | | |
|Controller, PEM) | |13.1.3 | | | | |
| +------+----------+----------+ | | |
| |12.x |12.1.0 - |12.1.5.1 | | | |
| | |12.1.5 | | | | |
| +------+----------+----------+ | | |
| |11.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
|Enterprise Manager |3.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+-------------------+------+----------+----------+----------+------+----------+
| |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 change the TCP congestion control
setting back to the default value. 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 Local Traffic > Profiles > Protocol > TCP.
3. Select the name of the profile to edit.
4. In the Congestion Control section, select High Speed for the Congestion
Control setting.
5. Select Update.
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 - 15.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
============================================================================
K95117754:TMM vulnerability CVE-2019-6684
Security Advisory
Original Publication Date: 21 Dec, 2019
Latest Publication Date: 10 Feb, 2020
Security Advisory Description
Under certain conditions, a multi-bladed BIG-IP Virtual Clustered
Multiprocessing (vCMP) may drop broadcast packets when they are rebroadcast to
the vCMP guest secondary blades. An attacker can leverage the fragmented
broadcast IP packets to perform any type of fragmentation-based attack. (
CVE-2019-6684)
Impact
A remote attacker may cause the Traffic Management Microkernel (TMM) to restart
using maliciously constructed broadcast IP fragments.
Security Advisory Status
F5 Product Development has assigned ID 761144 (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 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| | | | |
+-------------------+------+----------+----------+----------+------+----------+
| |15.x |15.0.0 - |15.1.0 | | | |
| | |15.0.1 | | | | |
| +------+----------+----------+ | | |
| |14.x |14.0.0 - |14.1.2.3 | | | |
|BIG-IP (LTM, AAM, | |14.1.2 | | | | |
|AFM, Analytics, +------+----------+----------+ | | |
|APM, ASM, DNS, FPS,|13.x |13.0.0 - |13.1.3.2 |Medium |4.3 |TMM |
|GTM, Link | |13.1.3 | | | | |
|Controller, PEM) +------+----------+----------+ | | |
| |12.x |12.1.0 - |12.1.5.1 | | | |
| | |12.1.5 | | | | |
| +------+----------+----------+ | | |
| |11.x |11.5.2 - |None | | | |
| | |11.6.5 | | | | |
+-------------------+------+----------+----------+----------+------+----------+
|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| | | |
+-------------------+------+----------+----------+----------+------+----------+
| |5.x |None |Not | | | |
| | | |applicable|Not | | |
|Traffix SDC +------+----------+----------+vulnerable|None |None |
| |4.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
^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 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 - 15.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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