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AUSCERT External Security Bulletin Redistribution
ESB-2015.3207
sol34250741: BIND vulnerability CVE-2015-8000 Security Advisory
23 December 2015
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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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