Operating System:

[Appliance]

Published:

28 November 2019

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                              ESB-2019.3597.2
             HTTP/2 Settings Flood vulnerability CVE-2019-9515
                             28 November 2019

===========================================================================

        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-2019-9518 CVE-2019-9517 CVE-2019-9516
                   CVE-2019-9515 CVE-2019-9514 CVE-2019-9513
                   CVE-2019-9512 CVE-2019-9511 

Reference:         ESB-2019.3227
                   ESB-2019.3133
                   ESB-2019.3116
                   ESB-2019.3114

Original Bulletin: 
   https://support.f5.com/csp/article/K50233772

Revision History:  November  28 2019: A fix is available for v15.x.
                   September 25 2019: Initial Release

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K50233772:HTTP/2 Settings Flood vulnerability CVE-2019-9515

Original Publication Date: 20 Aug, 2019
Latest   Publication Date: 27 Nov, 2019

Security Advisory Description

Some HTTP/2 implementations are vulnerable to a settings flood, potentially
leading to a denial of service. The attacker sends a stream of SETTINGS frames
to the peer. Since the RFC requires that the peer reply with one
acknowledgement per SETTINGS frame, an empty SETTINGS frame is almost
equivalent in behavior to a ping. Depending on how efficiently this data is
queued, this can consume excess CPU, memory, or both. (CVE-2019-9515)

Impact

The BIG-IP system may exhaust available resources and fail over to another
system in the device group.

Security Advisory Status

F5 Product Development has assigned ID 788773 (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 -  |15.0.1.1  |          |      |          |
|                   |      |15.0.1    |          |          |      |          |
|                   +------+----------+----------+          |      |          |
|                   |14.x  |14.0.0 -  |14.1.2.1  |          |      |          |
|                   |      |14.1.2    |14.0.1.1  |          |      |Virtual   |
|                   +------+----------+----------+          |      |servers   |
|BIG-IP (LTM)       |13.x  |13.1.0 -  |13.1.3.2  |Medium    |5.0   |configured|
|                   |      |13.1.3    |          |          |      |to use the|
|                   +------+----------+----------+          |      |HTTP/2    |
|                   |12.x  |12.1.0 -  |None      |          |      |profile   |
|                   |      |12.1.5    |          |          |      |          |
|                   +------+----------+----------+          |      |          |
|                   |11.x  |11.6.1 -  |11.6.5.1  |          |      |          |
|                   |      |11.6.5    |          |          |      |          |
+-------------------+------+----------+----------+----------+------+----------+
|                   |15.x  |None      |Not       |          |      |          |
|                   |      |          |applicable|          |      |          |
|                   +------+----------+----------+          |      |          |
|BIG-IP (AAM, AFM,  |14.x  |None      |Not       |          |      |          |
|Analytics, APM,    |      |          |applicable|          |      |          |
|ASM, DNS, Edge     +------+----------+----------+          |      |          |
|Gateway, FPS, GTM, |13.x  |None      |Not       |Not       |None  |None      |
|Link Controller,   |      |          |applicable|vulnerable|      |          |
|PEM,               +------+----------+----------+          |      |          |
|WebAccelerator)    |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

None

Acknowledgements

F5 would like to acknowledge Jonathan Looney with Netflix for their efforts in
identifying this issue.

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