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AUSCERT External Security Bulletin Redistribution
ESB-2014.2508
SOL15927: BIND vulnerability CVE-2014-8500
23 December 2014
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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: Mitigation
CVE Names: CVE-2014-8500
Reference: ESB-2014.2390
ESB-2014.2350
ESB-2014.2324
ESB-2014.2323
Original Bulletin:
https://support.f5.com/kb/en-us/solutions/public/15000/900/sol15927.html
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SOL15927: BIND vulnerability CVE-2014-8500
Security AdvisorySecurity Advisory
Original Publication Date: 12/19/2014
Updated Date: 12/19/2014
Description
ISC BIND 9.0.x through 9.8.x, 9.9.0 through 9.9.6, and 9.10.0 through 9.10.1
does not limit delegation chaining, which allows remote attackers to cause a
denial of service (memory consumption and named crash) via a large or infinite
number of referrals. (CVE-2014-8500)
Impact
This behavior may lead to resource exhaustion and denial-of-service (up to and
including termination of the named server process.) All recursive resolvers
are affected. Authoritative servers may be affected if an attacker can control
a delegation traversed by the authoritative server in servicing the zone.
Important: Recursion is not enabled by default for BIG-IP modules.
Status
F5 Product Development has assigned ID 492367 (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 Vulnerable component or feature
BIG-IP LTM 11.0.0 - 11.6.0
10.1.0 - 10.2.4 None BIND*
BIG-IP AAM None 11.4.0 - 11.6.0 None
BIG-IP AFM None 11.3.0 - 11.6.0 None
BIG-IP Analytics None 11.0.0 - 11.6.0 None
BIG-IP APM None 11.0.0 - 11.6.0 10.1.0 - 10.2.4 None
BIG-IP ASM None 11.0.0 - 11.6.0
10.1.0 - 10.2.4 None
BIG-IP Edge Gateway None 11.0.0 - 11.3.0
10.1.0 - 10.2.4 None
BIG-IP GTM 11.0.0 - 11.6.0
10.1.0 - 10.2.4 None BIND*
BIG-IP Link Controller None 11.0.0 - 11.6.0
10.1.0 - 10.2.4 None
BIG-IP PEM None 11.3.0 - 11.6.0 None
BIG-IP PSM None 11.0.0 - 11.4.1
10.0.0 - 10.2.4 None
BIG-IP WebAccelerator None 11.0.0 - 11.3.0
10.0.0 - 10.2.4 None
BIG-IP WOM None 11.0.0 - 11.3.0
10.0.0 - 10.2.4 None
ARX None 6.2.0 - 6.4.0 None
Enterprise Manager None 3.0.0 - 3.1.1
2.1.0 - 2.3.0 None
FirePass None 7.0.0
6.0.0 - 6.1.0 None
BIG-IQ Cloud None 4.0.0 - 4.4.0 None
BIG-IQ Device None 4.2.0 - 4.4.0 None
BIG-IQ Security None 4.0.0 - 4.4.0 None
*The LTM and GTM modules are not vulnerable by default. In order to be
vulnerable, recursion must be manually enabled in the BIND named.conf file.
Recommended Action
If the previous table lists a version in the Versions known to be not
vulnerable column, you can eliminate this vulnerability by upgrading to the
listed version. If the listed version is older than the version you are
currently running, or if the table does not list any version in the column,
then no upgrade candidate currently exists.
F5 is responding to this vulnerability as determined by the parameters defined
in SOL4602: Overview of the F5 security vulnerability response policy.
Determining if recursion has been manually enabled on the system
To determine if recursion has been manually enabled on the system, perform the
following procedure:
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 following 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 turn recursion off in the named.conf
file. To do so, perform the following procedure:
Impact of action: This modification will require a change to your
configuration, and should be tested in an appropriate environment prior to
implementation.
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.SOL15927
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 named 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.
SOL4602: Overview of the F5 security vulnerability response policy
SOL4918: Overview of the F5 critical issue hotfix policy
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