Date: 11 February 2016
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AUSCERT External Security Bulletin Redistribution
Cisco ASA Software IKEv1 and IKEv2 Buffer Overflow Vulnerability
11 February 2016
AusCERT Security Bulletin Summary
Product: Cisco ASA Software
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2016-1287
Comment: SANS has announced exploits are likely to be attempted over UDP ports
500 and 4500 and reports observing a spike in traffic destined for
those ports. The full blog is available at:
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Cisco Security Advisory
Cisco ASA Software IKEv1 and IKEv2 Buffer Overflow Vulnerability
Advisory ID: cisco-sa-20160210-asa-ike
Published: 2016 February 10 16:00 GMT
Version 1.0: Final
Base - 10.0
No workarounds available
Cisco Bug IDs:
A vulnerability in the Internet Key Exchange (IKE) version 1 (v1) and IKE
version 2 (v2) code of Cisco ASA Software could allow an unauthenticated,
remote attacker to cause a reload of the affected system or to remotely
The vulnerability is due to a buffer overflow in the affected code area. An
attacker could exploit this vulnerability by sending crafted UDP packets to
the affected system. An exploit could allow the attacker to execute arbitrary
code and obtain full control of the system or to cause a reload of the
Note: Only traffic directed to the affected system can be used to exploit this
vulnerability. This vulnerability affects systems configured in routed
firewall mode only and in single or multiple context mode. This vulnerability
can be triggered by IPv4 and IPv6 traffic.
Cisco has released software updates that address this vulnerability. This
advisory is available at the following link:
Affected Cisco ASA Software running on the following products may be affected
by this vulnerability:
Cisco ASA 5500 Series Adaptive Security Appliances
Cisco ASA 5500-X Series Next-Generation Firewalls
Cisco ASA Services Module for Cisco Catalyst 6500 Series Switches and Cisco
7600 Series Routers
Cisco ASA 1000V Cloud Firewall
Cisco Adaptive Security Virtual Appliance (ASAv)
Cisco Firepower 9300 ASA Security Module
Cisco ISA 3000 Industrial Security Appliance
Refer to the "Fixed Software" section...
There are no workarounds that address this vulnerability.
Cisco has released free software updates that address the vulnerability
described in this advisory. Customers may only install and expect support for
software versions and feature sets for which they have purchased a license. By
installing, downloading, accessing, or otherwise using such software upgrades,
customers agree to follow the terms of the Cisco software license:
Additionally, customers may only download software for which they have a valid
license, procured from Cisco directly, or through a Cisco authorized reseller
or partner. In most cases this will be a maintenance upgrade to software that
was previously purchased. Free security software updates do not entitle
customers to a new software license, additional software feature sets, or
major revision upgrades.
When considering software upgrades, customers are advised to consult the Cisco
Security Advisories and Responses archive at http://www.cisco.com/go/psirt and
review subsequent advisories to determine exposure and a complete upgrade
In all cases, customers should ensure that the devices to upgrade contain
sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release. If
the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance providers.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but are
unsuccessful in obtaining fixed software through their point of sale should
obtain upgrades by contacting the Cisco Technical Assistance Center (TAC):
Customers should have the product serial number available and be prepared to
provide the URL of this advisory as evidence of entitlement to a free upgrade.
In the following table, the left column lists major releases of Cisco ASA
Software. The right column indicates whether a major release is affected by
the vulnerability described in this advisory and the first release that
includes the fix for this vulnerability.
Cisco ASA Major Release First Fixed Release
7.2 Affected; migrate to 9.1(7) or later
8.2 Affected; migrate to 9.1(7) or later
8.3 Affected; migrate to 9.1(7) or later
8.5 Not affected
8.6 Affected; migrate to 9.1(7) or later
Cisco ASA Software releases 7.2, 8.2, 8.3, 8.5, and 8.6 have reached End
of Software Maintenance. Customers should migrate to a supported release.
Exploitation and Public Announcements
The Cisco Product Security Incident Response Team (PSIRT) is not aware of any
public announcements or malicious use of the vulnerability that is described
in this advisory.
This vulnerability was reported to Cisco by David Barksdale, Jordan
Gruskovnjak, and Alex Wheeler of Exodus Intelligence.
Version Description Section Status Date
1.0 Initial public release Final 2016-February-10
THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF
GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS
LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO
CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A standalone copy or paraphrase of the text of this document that omits the
distribution URL is an uncontrolled copy and may lack important information or
contain factual errors. The information in this document is intended for end
users of Cisco products.
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