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AUSCERT External Security Bulletin Redistribution
ESB-2016.0644
SOL62012529: BIND vulnerability CVE-2016-1286
10 March 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: F5 BIG-IP products
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Mitigation
CVE Names: CVE-2016-1286
Reference: ESB-2016.0640
Original Bulletin:
https://support.f5.com/kb/en-us/solutions/public/k/62/sol62012529.html
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SOL62012529: BIND vulnerability CVE-2016-1286
Security Advisory
Original Publication Date: 03/09/2016
Vulnerability Description
An error when parsing RRSIGs for DNAME records having specific properties can
lead to named exiting due to an assertion failure in resolver.c or db.c. This
vulnerability is exposed when recursion is enabled and the attacker can force
a query against a server providing malicious responses. (CVE-2016-1286 -
reserved)
Impact
An attacker may force the system to look up a malicious server that is serving
bad RRSIGs, and may cause the BIND service to restart.
Note: Typically, a BIND service restart does not cause the affected system to
fail over.
BIG-IP
Although BIG-IP software contains the vulnerable code, the BIG-IP system does
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 service.
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 are 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.
ARX/FirePass/LineRate
There is no impact. These F5 products are not vulnerable to these
vulnerabilities.
BIG-IQ/Enterprise Manager/F5 WebSafe/Traffix
Currently unknown. F5 is still researching the issue, and will update this
article when the information has been confirmed. F5 Technical Support does not
have any additional information on this issue.
Security Issue Status
F5 Product Development has assigned ID 577826 (BIG-IP) 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 to be not vulnerable Severity Vulnerable component or feature
BIG-IP LTM 12.0.0 None High BIND
11.6.0
11.0.0 - 11.5.4
10.1.0 - 10.2.4
BIG-IP AAM 12.0.0 None High BIND
11.6.0
11.4.0 - 11.5.4
BIG-IP AFM 12.0.0 None High BIND
11.6.0
11.3.0 - 11.5.4
BIG-IP Analytics 12.0.0 None High BIND
11.6.0
11.0.0 - 11.5.4
BIG-IP APM 12.0.0 None High BIND
11.6.0
11.0.0 - 11.5.4
10.1.0 - 10.2.4
BIG-IP ASM 12.0.0 None High BIND
11.6.0
11.0.0 - 11.5.4
10.1.0 - 10.2.4
BIG-IP DNS 12.0.0 None High BIND
BIG-IP Edge Gateway 11.0.0 - 11.3.0 None High BIND
10.1.0 - 10.2.4
BIG-IP GTM 11.6.0 None High BIND
11.0.0 - 11.5.4
10.1.0 - 10.2.4
BIG-IP Link Controller 12.0.0 None High BIND
11.6.0
11.0.0 - 11.5.4
10.1.0 - 10.2.4
BIG-IP PEM 12.0.0 None High BIND
11.6.0
11.3.0 - 11.5.4
BIG-IP PSM 11.0.0 - 11.4.1 None High BIND
10.1.0 - 10.2.4
BIG-IP WebAccelerator 11.0.0 - 11.3.0 None High BIND
10.1.0 - 10.2.4
BIG-IP WOM 11.0.0 - 11.3.0 None High BIND
10.1.0 - 10.2.4
ARX None 6.0.0 - 6.4.0 Not vulnerable None
Enterprise Manager ** ** ** **
FirePass None 7.0.0 Not vulnerable None
6.0.0 - 6.1.0
BIG-IQ Cloud ** ** ** **
BIG-IQ Device ** ** ** **
BIG-IQ Security ** ** ** **
BIG-IQ ADC ** ** ** **
BIG-IQ Centralized ** ** ** **
Management
BIG-IQ Cloud and ** ** ** **
Orchestration
LineRate None 2.5.0 - 2.6.1 Not vulnerable None
F5 WebSafe ** ** ** **
Traffix SDC ** ** ** **
**Confirmation of vulnerability or non-vulnerability is not presently
available. F5 is still researching the issue for the products indicated, and
will update this article with the most current information as soon as it has
been confirmed. F5 Technical Support does not have any additional information
on this issue.
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.
Vulnerability Recommended Actions
BIG-IP
To mitigate this vulnerability, you must disable the use of recursion in the
BIND configuration. To determine if recursion has been manually enabled, and
mitigate the vulnerability by disabling recursion, perform the following
procedures.
Determining if recursion has been manually enabled on the system
Impact of action: Performing the following procedure should not have a
negative impact on your system.
1. Log in to the BIG-IP command line.
2. Type the following command:
grep recursion /var/named/config/named.conf
3. If the command returns the following response, recursion has been enabled, and
you should perform the Mitigating the vulnerability procedure.
recursion yes;
If the command returns the following response, recursion has not been enabled,
and the system is not vulnerable.
recursion no;
Mitigating the vulnerability
To mitigate this vulnerability, you can disable recursion in the named.conf
file. To do so, perform the following procedure:
Impact of action: This modification requires changing your configuration. F5
recommends that you test the modified configuration in an appropriate
environment before implementing it.
1. Log in to the BIG-IP command line.
2. Change directories to the /var/named/config directory by typing the following
command:
cd /var/named/config
3. Create a backup of the named.conf file by typing the following command:
cp named.conf named.conf.SOL34250741
4. To edit the named.conf file, locate the recursion option.
For example:
recursion yes;
5. Change the recursion option to no.
For example:
recursion no;
6. Save the changes to the named.conf file.
7. Restart the named process to allow the changes to reload, by typing the
following command:
bigstart restart named
Supplemental Information
SOL9970: Subscribing to email notifications regarding F5 products
SOL9957: Creating a custom RSS feed to view new and updated documents
SOL4918: Overview of the F5 critical issue hotfix policy
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