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

                               ESB-2016.2060
   SOL52638558: RESOLV::lookup iRule command vulnerability CVE-2016-6876
                              31 August 2016

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

        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-2016-6876  

Original Bulletin: 
   http://support.f5.com/kb/en-us/solutions/public/k/52/sol52638558.html

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SOL52638558: RESOLV::lookup iRule command vulnerability CVE-2016-6876

Security Advisory

Original Publication Date: 08/30/2016

Vulnerability Description

A specially crafted reply to DNS queries from RESOLV::lookup may consume 
excess system resources or possibly lead to a crash and failover. 
(CVE-2016-6876)

Impact

The BIG-IP system may consume excess system resources, or experience a Traffic
Management Microkernel (TMM) core and fail over. This vulnerability can only 
be triggered if you use the RESOLV::lookup iRule command to resolve PTR 
records. Other configurations that use the RESOLV::lookup iRule command are 
not affected by this vulnerability.

Security Issue Status

F5 Product Development has assigned ID 550596 (BIG-IP) to this vulnerability.

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 - 12.1.1 			Medium 		RESOLV::lookup iRule command 
				11.4.0 - 11.6.0 			12.0.0 HF3 
				11.2.1					11.6.1 
				10.2.1 - 10.2.4 			11.5.4 HF2

BIG-IP AAM 			12.0.0 					12.1.0 - 12.1.1 			Medium 		RESOLV::lookup iRule command 
				11.4.0 - 11.6.0 			12.0.0 HF3 
									11.6.1 			
									11.5.4 HF2

BIG-IP AFM 			12.0.0 					12.1.0 - 12.1.1 			Medium 		RESOLV::lookup iRule command 
				11.4.0 - 11.6.0 			12.0.0 HF3 
									11.6.1 
									11.5.4 HF2

BIG-IP Analytics 		12.0.0 					12.1.0 - 12.1.1 			Medium 		RESOLV::lookup iRule command 
				11.4.0 - 11.6.0 			12.0.0 HF3 
				11.2.1 					11.6.1 
									11.5.4 HF2

BIG-IP APM 			12.0.0 					12.1.0 - 12.1.1 			Medium 		RESOLV::lookup iRule command
				11.4.0 - 11.6.0 			12.0.0 HF3 
				11.2.1 					11.6.1					
				10.2.1 - 10.2.4				11.5.4 HF2 

BIG-IP ASM 			12.0.0					12.1.0 - 12.1.1				Medium 		RESOLV::lookup iRule command
				11.4.0 - 11.6.0				12.0.0 HF3
				11.2.1					11.6.1
				10.2.1 - 10.2.4 			11.5.4 HF2

BIG-IP DNS 			12.0.0 					12.1.0 - 12.1.1				Medium 		RESOLV::lookup iRule command
									12.0.0 HF3 

BIG-IP Edge Gateway 		11.2.1					None 					Medium 		RESOLV::lookup iRule command
				10.2.1 - 10.2.4 

BIG-IP GTM 			11.4.0 - 11.6.0				11.6.1					Medium 		RESOLV::lookup iRule command
				11.2.1					11.5.4 HF2 
				10.2.1 - 10.2.4 

BIG-IP Link Controller 		12.0.0					12.1.0 - 12.1.1				Medium 		RESOLV::lookup iRule command
				11.4.0 - 11.6.0				12.0.0 HF3
				11.2.1					11.6.1
				10.2.1 - 10.2.4 			11.5.4 HF2 

BIG-IP PEM 			12.0.0					12.1.0 - 12.1.1				Medium 		RESOLV::lookup iRule command
				11.4.0 - 11.6.0 			12.0.0 HF3
									11.6.1
									11.5.4 HF2 

BIG-IP PSM 			11.4.0 - 11.4.1				None 					Medium 		RESOLV::lookup iRule command

				10.2.1 - 10.2.4 

BIG-IP WebAccelerator 		11.2.1					None 					Medium 		RESOLV::lookup iRule command
				10.2.1 - 10.2.4 

BIG-IP WOM 			11.2.1					None 					Medium 		RESOLV::lookup iRule command
				10.2.1 - 10.2.4 			

BIG-IP WebSafe 			None 					12.0.0 - 12.1.1				Not vulnerable	None
									11.6.0 - 11.6.1 

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 Management 	None 					5.0.0					Not vulnerable 	None
									4.6.0 

BIG-IQ Cloud and Orchestration 	None 					1.0.0 					Not vulnerable 	None

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 

Vulnerability 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.

To mitigate this vulnerability, you can avoid using the RESOLV::lookup iRule 
command to resolve PTR records.

Supplemental Information

SOL9970: Subscribing to email notifications regarding F5 products

SOL9957: Creating a custom RSS feed to view new and updated documents

SOL4602: Overview of the F5 security vulnerability response policy

SOL4918: Overview of the F5 critical issue hotfix policy

SOL167: Downloading software and firmware from F5

SOL13123: Managing BIG-IP product hotfixes (11.x - 12.x)

SOL10025: Managing BIG-IP product hotfixes (10.x)

SOL9502: BIG-IP hotfix matrix

The RESOLV::lookup DevCentral page

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