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AUSCERT External Security Bulletin Redistribution
ESB-2019.1511.2
K47527163:CGNAT/PPTP vulnerability CVE-2019-6611
7 May 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: F5 BIG-IP Products
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-6611
Original Bulletin:
https://support.f5.com/csp/article/K47527163
Revision History: May 7 2019: Heuristics noted for BIG-IP iHealth
May 2 2019: Initial Release
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K47527163:CGNAT/PPTP vulnerability CVE-2019-6611
Security Advisory
Original Publication Date: 01 May, 2019
Latest Publication Date: 07 May, 2019
Security Advisory Description
When processing certain rare data sequences occurring in PPTP VPN traffic, the
BIG-IP system may execute incorrect logic. The TMM may restart and produce a
core file as a result of this condition. The BIG-IP system provisioned with the
CGNAT module and configured with a virtual server using a PPTP profile is
exposed to this vulnerability. (CVE-2019-6611)
Impact
The 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.
Security Advisory Status
F5 Product Development has assigned ID 749879 (BIG-IP) to this vulnerability.
Additionally, BIG-IP iHealth may list Heuristic H47527163 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 - |14.1.0.2 | | | |
| | |14.1.0 | | | | |
| +------+----------+----------+ | | |
|BIG-IP (LTM, AAM, |13.x |13.0.0 - |13.1.1.5 | | | |
|AFM, Analytics, | |13.1.1 | | | | |
|APM, ASM, DNS, Edge+------+----------+----------+ | | |
|Gateway, FPS, GTM, |12.x |12.1.0 - |12.1.4.1 |High |7.5 |CGNAT |
|Link Controller, | |12.1.4 | | | | |
|PEM, +------+----------+----------+ | | |
|WebAccelerator) | |11.6.1 - | | | | |
| |11.x |11.6.3 |11.6.4 | | | |
| | |11.5.2 - |11.5.9 | | | |
| | |11.5.8 | | | | |
+-------------------+------+----------+----------+----------+------+----------+
|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 can filter the network access to the
affected virtual server and allow only known, trusted clients to connect. You
can configure the BIG-IP system that is provisioned with the AFM module to
filter the trusted clients by way of the source addresses, through an AFM rule.
For BIG-IP systems without the AFM module provisioned, you can add the trusted
clients as the source addresses that the affected virtual server will listen
to. Alternatively, you can use an external packet filtering device.
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 - 13.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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