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AUSCERT External Security Bulletin Redistribution
ESB-2016.2280
sol18829561: BIND vulnerability CVE-2016-2776
28 September 2016
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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-2016-2776
Reference: ESB-2016.2273
ESB-2016.2266
ESB-2016.2264
Original Bulletin:
https://support.f5.com/kb/en-us/solutions/public/k/18/sol18829561.html
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sol18829561: BIND vulnerability CVE-2016-2776
Security Advisory
Original Publication Date: 09/27/2016
Vulnerability Description
Testing by ISC has uncovered a critical error condition which can
occur when a nameserver is constructing a response. A defect in the
rendering of messages into packets can cause named to exit with an
assertion failure in buffer.c while constructing a response to a query
that meets certain criteria. This assertion can be triggered even if the
apparent source address isn't allowed to make queries (i.e. doesn't match
'allow-query'). (CVE-2016-2776)
Impact
BIG-IP
A remote attacker may be able to cause a denial-of-service (DoS) attack
on the BIG-IP system's local instance of BIND by using a specially crafted
DNS request in configurations that expose BIND to requests from untrusted
users. If the BIND process (named) terminates or stops responding, the
bigstart process will automatically restart the impacted daemon.
Note: The default BIND configuration is vulnerable. However, if a BIG-IP
GTM configuration object in the GTM resolution hierarchy can provide an
appropriate answer before the DNS query reaches the local bind instance
on the BIG-IP system, then the chance of local bind being exposed to this
vulnerability is lessened.
BIG-IQ, Enterprise Manager, and iWorkflow
Neither the BIG-IQ system, the Enterprise Manager system, or the F5
iWorkflow system is vulnerable in the default standard configuration. This
vulnerability can be exposed only when the BIG-IQ system, Enterprise
Manager system, or iWorkflow system is manually configured to act as a
DNS server. F5 recommends that you do not configure any of these systems
to act as a DNS server.
Security Issue Status
F5 Product Development has assigned ID 616864 (BIG-IP), ID 617867 (BIG-IQ
and iWorkflow), and ID 617869 (Enterprise Manager) 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 Versions known to Severity Vulnerable component or feature
to be vulnerable be not vulnerable
BIG-IP LTM 12.0.0 - 12.1.1 None High BIND
11.4.0 - 11.6.1
11.2.1
10.2.1 - 10.2.4
BIG-IP AAM 12.0.0 - 12.1.1 None High BIND
11.4.0 - 11.6.1
BIG-IP AFM 12.0.0 - 12.1.1 None High BIND
11.4.0 - 11.6.1
BIG-IP Analytics 12.0.0 - 12.1.1 None High BIND
11.4.0 - 11.6.1
11.2.1
BIG-IP APM 12.0.0 - 12.1.1 None High BIND
11.4.0 - 11.6.1
11.2.1
10.2.1 - 10.2.4
BIG-IP ASM 12.0.0 - 12.1.1 None High BIND
11.4.0 - 11.6.1
11.2.1
10.2.1 - 10.2.4
BIG-IP DNS 12.0.0 - 12.1.1 None High BIND
BIG-IP Edge Gateway 11.2.1 None High BIND
10.2.1 - 10.2.4
BIG-IP GTM 11.4.0 - 11.6.1 None High BIND
11.2.1
10.2.1 - 10.2.4
BIG-IP Link Controller 12.0.0 - 12.1.1 None High BIND
11.4.0 - 11.6.1
11.2.1
10.2.1 - 10.2.4
BIG-IP PEM 12.0.0 - 12.1.1 None High BIND
11.4.0 - 11.6.1
BIG-IP PSM 11.4.0 - 11.4.1 None High BIND
10.2.1 - 10.2.4
BIG-IP WebAccelerator 11.2.1 None High BIND
10.2.1 - 10.2.4
BIG-IP WOM 11.2.1 None High BIND
10.2.1 - 10.2.4
BIG-IP WebSafe 12.0.0 - 12.1.0 None High BIND
11.6.0 - 11.6.1
ARX None 6.2.0 - 6.4.0 Not vulnerable None
Enterprise Manager 3.1.1 None Low BIND
FirePass None 7.0.0 Not vulnerable None
BIG-IQ Cloud 4.0.0 - 4.5.0 None Low BIND
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 Management 5.1.0 None Low BIND
4.6.0
BIG-IQ Cloud and Orchestration 1.0.0 None Low BIND
F5 iWorkflow 2.0.0 None Low BIND
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 determine the necessary upgrade path for your BIG-IQ system, you should
understand the BIG-IQ product offering name changes. For more information,
refer to SOL21232150: Considerations for upgrading BIG-IQ or F5 iWorkflow
systems.
Mitigation
To mitigate this vulnerability for the BIG-IQ system, the Enterprise Manager
system, or the F5 iWorkflow system, you should not configure any of these
systems to function as a DNS server.
Impact of action: Performing the suggested mitigation should not have a
negative impact on your system.
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
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