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AUSCERT External Security Bulletin Redistribution
ESB-2019.1513
K94563344:HTTP/2 ALPN vulnerability CVE-2019-6619
2 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-2019-6619
Original Bulletin:
https://support.f5.com/csp/article/K94563344
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K94563344:HTTP/2 ALPN vulnerability CVE-2019-6619
Security Advisory
Original Publication Date: 01 May, 2019
Security Advisory Description
The Traffic Management Microkernel (TMM) may restart when a virtual server has
an HTTP/2 profile with Application Layer Protocol Negotiation (ALPN) enabled
and it processes traffic where the ALPN extension size is zero. (CVE-2019-6619)
Impact
BIG-IP
The Traffic Management Microkernel (TMM) generates a core file and restarts. If
configured as part of a high availability (HA) device group, the BIG-IP system
fails over to the peer device. For BIG-IP versions 13.1.0 and later, the ALPN
setting is enabled on the HTTP/2 profile by default.
Enterprise Manager, BIG-IQ, F5 iWorkflow, Traffix SDC
There is no impact on these F5 products and they are not affected by this
vulnerability.
Security Advisory Status
F5 Product Development has assigned ID 745713 (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| | | | |
+-------------------+------+----------+----------+----------+------+----------+
| |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, APM, ASM, Link| |13.1.1 | | | | |
|Controller, PEM, +------+----------+----------+Medium |5.3 |HTTP/2 |
|WebAccelerator) |12.x |12.1.0 - |12.1.4.1 | | | |
| | |12.1.4 | | | | |
| +------+----------+----------+ | | |
| |11.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
| |14.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |13.x |None |Not | | | |
|BIG-IP (Analytics, | | |applicable|Not | | |
|DNS, Edge Gateway, +------+----------+----------+vulnerable|None |None |
|FPS, GTM) |12.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |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 mitigation this vulnerability, avoid using the HTTP/2 profile with the APLN
setting enabled. For more information about the BIG-IP HTTP/2 profile settings,
refer to K04412053: Overview of the BIG-IP HTTP/2 profile.
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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