Operating System:

[Appliance]

Published:

23 December 2015

Protect yourself against future threats.

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

                               ESB-2015.3207
      sol34250741: BIND vulnerability CVE-2015-8000 Security Advisory
                             23 December 2015

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

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           BIG-IP
                   BIG-IQ
                   Enterprise Manager
Publisher:         F5
Operating System:  Network Appliance
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-8000  

Reference:         ESB-2015.3145

Original Bulletin: 
   http://support.f5.com/kb/en-us/solutions/public/k/34/sol34250741.html

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sol34250741: BIND vulnerability CVE-2015-8000 Security Advisory

Original Publication Date: 12/16/2015

Vulnerability Description

An error in the parsing of incoming responses allows some records with an 
incorrect class to be be accepted by BIND instead of being rejected as 
malformed. This can trigger a REQUIRE assertion failure when those records are
subsequently cached. Intentional exploitation of this condition is possible 
and could be used as a denial-of-service vector against servers performing 
recursive queries. (CVE-2015-8000)

Impact

An attack may cause a denial-of-service (DoS) on the vulnerable BIND system by
requesting a record that contains a malformed class attribute.

Although the BIG-IP, BIG-IQ, and Enterprise Manager software contains the 
vulnerable code, the BIG-IP, BIG-IQ, and Enterprise Manager systems do not use
the vulnerable code in a way that exposes the vulnerability in the default 
configuration.

The BIG-IP system must meet both of the following conditions to be considered
vulnerable:

A listener object is configured to use the local BIND.

For example:

A virtual server with a DNS profile is configured with the Use BIND Server on
BIG-IP option (this option is enabled by default for the DNS profile)

A DNS/GTM pool uses the Return to DNS load balancing method or its Alternate 
and Fallback load balancing methods set to None and all pools associated with
the wide IP are unavailable.

The local BIND configuration is enabled with the non-default recursion yes; 
option.

Security Issue Status

F5 Product Development has assigned ID 560180 (BIG-IP), ID 562693 (BIG-IQ) and
ID 562695 (Enterprise Manager) to this vulnerability, and has evaluated the 
currently supported releases for potential 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	Severity	Vulnerable 
								to be not			component  
								vulnerable			or feature

BIG-IP LTM 		12.0.0 11.0.0 - 11.6.0 10.1.0 - 10.2.4	None 		High 		BIND

BIG-IP AAM 		12.0.0 11.4.0 - 11.6.0 			None 		High 		BIND

BIG-IP AFM 		12.0.0 11.3.0 - 11.6.0 			None 		High 		BIND

BIG-IP Analytics	12.0.0 11.0.0 - 11.6.0 			None 		High 		BIND

BIG-IP APM 		12.0.0 11.0.0 - 11.6.0 10.1.0 - 10.2.4 	None 		High 		BIND

BIG-IP ASM 		12.0.0 11.0.0 - 11.6.0 10.1.0 - 10.2.4 	None 		High 		BIND

BIG-IP DNS 		12.0.0 					None 		High 		BIND

BIG-IP Edge Gateway 	11.0.0 - 11.3.0 10.1.0 - 10.2.4 	None 		High 		BIND

BIG-IP GTM 		11.0.0 - 11.6.0 10.1.0 - 10.2.4 	None 		High 		BIND

BIG-IP Link Controller 	12.0.0 11.0.0 - 11.6.0 10.1.0 - 10.2.4 	None 		High 		BIND

BIG-IP PEM 		12.0.0 11.3.0 - 11.6.0 			None 		High 		BIND

BIG-IP PSM 		11.0.0 - 11.4.1 10.1.0 - 10.2.4 	None 		High 		BIND

BIG-IP WebAccelerator 	11.0.0 - 11.3.0 10.1.0 - 10.2.4 	None 		High 		BIND

BIG-IP WOM 		11.0.0 - 11.3.0 10.1.0 - 10.2.4 	None 		High 		BIND

ARX 			None 					6.0.0 - 6.4.0	Not vulnerable	None

BIG-IQ Device 		4.2.0 - 4.5.0 				None 		Low 		BIND

BIG-IQ Security 	4.0.0 - 4.5.0 				None 		Low 		BIND

BIG-IQ ADC 		4.5.0 					None 		Low 		BIND

BIG-IQ Centralized  	4.6.0 					None 		Low 		BIND
Management

BIG-IQ Cloud and 	1.0.0 					None 		Low 		BIND
Orchestration 

LineRate 		None 					2.5.0 - 2.6.1	Not vulnerable	None

F5 WebSafe 		None 					1.0.0 		Not vulnerable 	None

Traffix SDC 		None 					4.0.0 - 4.4.0  	Not vulnerable 	None
								3.3.2 - 3.5.1
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.

F5 responds to vulnerabilities in accordance with the Severity values 
published in the previous table. The Severity values and other security 
vulnerability parameters are defined in SOL4602: Overview of the F5 security 
vulnerability response policy.

To mitigate this vulnerability, you must disable the use of recursion in the 
BIND configuration. To do so, perform the following procedure appropriate for
your version:

Impact of action: This modification requires a change to your configuration. 
F5 recommends you test it in an appropriate environment before implementing 
it.

BIG-IP 11.5.0 and later

Log in to the Configuration utility.

Navigate to DNS > Zones > ZoneRunner.

Select Named Configuration.

Under the Options section, locate the following:

recursion yes;

Disable the recursion option by changing the line to the following:

recursion no;

To save the changes, click Update.

BIG-IP 11.4.1 and earlier

Log in to the Configuration utility.

Navigate to Global Traffic > ZoneRunner.

Select Named Configuration.

Under the Options section, locate the following:

recursion yes;

Disable the recursion option by changing the line to the following:

recursion no;

To save the changes, click Update.

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