ESB-2017.2904 - [Appliance] F5 products: Denial of service - Remote/unauthenticated 2017-11-15

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.2904
                K19784568: TMM vulnerability CVE-2016-5023
                             15 November 2017

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

        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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