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AUSCERT External Security Bulletin Redistribution
ESB-2017.2904
K19784568: TMM vulnerability CVE-2016-5023
15 November 2017
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AusCERT Security Bulletin Summary
---------------------------------
Product: F5 products
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2016-5023
Reference: ESB-2017.0823
ESB-2016.1966.2
Original Bulletin:
https://support.f5.com/csp/article/K19784568
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K19784568: TMM vulnerability CVE-2016-5023
Security Advisory
Original Publication Date: Aug 12, 2016
Updated Date: Nov 14, 2017
Applies to (see versions):
Security Advisory Description
An unauthenticated remote attacker may be able to disrupt services on the
BIG-IP with maliciously crafted network traffic. This vulnerability affects
virtual servers associated with TCP profiles. The management interface is not
affected by this vulnerability. (CVE-2016-5023)
Impact
The Traffic Management Microkernel (TMM) may restart and temporarily fail to
process traffic. Virtual servers configured with a TCP profile are vulnerable
to this issue. Additionally, BIG-IP systems running 11.5.x and earlier that
are configured with TCP profile settings Slow Start disabled (enabled by
default) and Congestion Metrics Cache enabled (enabled by default) have a
higher risk of exposure.
Security Advisory Status
F5 Product Development has assigned ID 572495 (BIG-IP) to this vulnerability.
Additionally, BIG-IP iHealth may list Heuristic H19784568 on the Diagnostics >
Identified > High screen.
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:
Product Versions known to be vulnerable Versions known to be not vulnerable Severity Vulnerable component or feature
BIG-IP LTM 12.0.0 12.1.0 High Virtual servers with TCP profile
11.6.0 12.0.0 HF3
11.4.0 - 11.5.4 11.6.1
11.2.1 11.5.4 HF2
11.2.1 HF16
10.2.1 - 10.2.4
BIG-IP AAM 12.0.0 12.1.0 High Virtual servers with TCP profile
11.6.0 12.0.0 HF3
11.4.0 - 11.5.4 11.6.1
11.5.4 HF2
BIG-IP AFM 12.0.01 12.1.0 High Virtual servers with TCP profile
11.6.01 12.0.0 HF3
11.4.0 - 11.5.41 11.6.1
11.5.4 HF2
BIG-IP Analytics 12.0.0 12.1.0 High Virtual servers with TCP profile
11.6.0 12.0.0 HF3
11.4.0 - 11.5.4 11.6.1
11.2.1 11.5.4 HF2
11.2.1 HF16
BIG-IP APM 12.0.0 12.1.0 High Virtual servers with TCP profile
11.6.0 12.0.0 HF3
11.4.0 - 11.5.4 11.6.1
11.2.1 11.5.4 HF2
11.2.1 HF16
10.2.1 - 10.2.4
BIG-IP ASM 12.0.0 12.1.0 High Virtual servers with TCP profile
11.6.0 12.0.0 HF3
11.4.0 - 11.5.4 11.6.1
11.2.1 11.5.4 HF2
11.2.1 HF16
10.2.1 - 10.2.4
BIG-IP DNS 12.0.0 12.1.0 High Virtual servers with TCP profile
12.0.0 HF3
BIG-IP Edge Gateway 11.2.1 11.2.1 HF16 High Virtual servers with TCP profile
10.2.1 - 10.2.4
BIG-IP GTM 11.6.0 11.6.1 High Virtual servers with TCP profile
11.4.0 - 11.5.4 11.5.4 HF2
11.2.1 11.2.1 HF16
10.2.1 - 10.2.4
BIG-IP Link Controller 12.0.0 12.1.0 High Virtual servers with TCP profile
11.6.0 12.0.0 HF3
11.4.0 - 11.5.4 11.6.1
11.2.1 11.5.4 HF2
11.2.1 HF16
10.2.1 - 10.2.4
BIG-IP PEM 12.0.0 12.1.0 High Virtual servers with TCP profile
11.6.0 12.0.0 HF3
11.4.0 - 11.5.4 11.6.1
11.5.4 HF2
BIG-IP PSM 11.4.0 - 11.4.1 10.2.1 - 10.2.4 High Virtual servers with TCP profile
11.2.1 11.2.1 HF16
BIG-IP WebAccelerator 11.2.1 11.2.1 HF16 High Virtual servers with TCP profile
10.2.1 - 10.2.4
F5 WebSafe None None Not vulnerable None
BIG-IP WOM 11.2.1 11.2.1 HF16 High Virtual servers with TCP profile
10.2.1 - 10.2.4
ARX None 6.2.0 - 6.4.0 Not vulnerable None
Enterprise Manager None 3.1.1 Not vulnerable None
FirePass None 7.0.0 Not vulnerable None
BIG-IQ Cloud None 4.0.0 - 4.5.0 Not vulnerable None
BIG-IQ Device None 4.2.0 - 4.5.0 Not vulnerable None
BIG-IQ Security None 4.0.0 - 4.5.0 Not vulnerable None
BIG-IQ ADC None 4.5.0 Not vulnerable None
BIG-IQ Centralized None 5.0.0 Not vulnerable None
Management
BIG-IQ Cloud and None 1.0.0 Not vulnerable None
Orchestration
F5 iWorkflow None 2.0.0 Not vulnerable None
LineRate None 2.5.0 - 2.6.1 Not vulnerable None
Traffix SDC None 5.0.0 Not vulnerable None
4.0.0 - 4.4.0
1 The BIG-IP system has increased exposure to the vulnerability if the system
meets the following criteria:
The BIG-IP system is running any of the following versions:
12.0.0 - 12.0.0 HF2
11.6.0 HF5 - 11.6.0 HF8
11.5.3 - 11.5.4 HF1
11.4.1 HF4 - 11.4.1 HF11
11.2.1 HF11 - 11.2.1 HF15
The BIG-IP system has virtual servers that are not associated with a TCP
Analytics profile but associated with a TCP profile that is configured with
the following settings:
Multipath TCP (mptcp) setting is disabled (default)
Rate Pace (rate-pace) setting of the Congestion Control section is disabled
(default)
Tail Loss Probe (tail-loss-probe) setting of the Loss Detection and Recovery
section is disabled (default)
Fast Open (fast-open) setting of the Connection Setup section is disabled
(default)
Congestion Metrics Cache Timeout (cmetrics-cache-timeout) setting of the
Congestion Control section is set to zero (default)
Congestion Control (congestion-control) setting of the Congestion Control
section is set to one of the following:
Reno
New Reno
High Speed (default)
Scalable
Nagle's Algorithm setting of the Data Transfer section is set to either
Enabled or Disabled (default)
Note: Changing the settings in the affected TCP profile to not match the
values previously described does not mitigate the vulnerability.
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 Versions known to be not vulnerable 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
There is no mitigation for this vulnerability.
Supplemental Information
K9970: Subscribing to email notifications regarding F5 products
K9957: Creating a custom RSS feed to view new and updated documents
K4602: Overview of the F5 security vulnerability response policy
K4918: Overview of the F5 critical issue hotfix policy
K167: Downloading software and firmware from F5
K13123: Managing BIG-IP product hotfixes (11.x - 13.x)
K10025: Managing BIG-IP product hotfixes (10.x)
K9502: BIG-IP hotfix matrix
K70025261: Overview of the TCP profile (12.x)
K13924148: Overview of the TCP profile (11.x)
K7559: Overview of the TCP profile (9.x - 10.x)
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