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ESB-2016.0348 - ALERT [Cisco] Cisco ASA Software: Execute arbitrary code/commands - Remote/unauthenticated

Date: 11 February 2016

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.0348
     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
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-1287  

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160210-asa-ike

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:
         
         https://isc.sans.edu/diary/Critical+Cisco+ASA+IKEv2v2+Vulnerability.+Active+Scanning+Detected/20719

- --------------------------BEGIN INCLUDED TEXT--------------------

Cisco Security Advisory

Cisco ASA Software IKEv1 and IKEv2 Buffer Overflow Vulnerability

Critical

Advisory ID: cisco-sa-20160210-asa-ike

Published: 2016 February 10 16:00 GMT

Version 1.0: Final

CVSS Score:

Base - 10.0

Workarounds:

No workarounds available

Cisco Bug IDs:

CSCux29978

CSCux42019

CVE-2016-1287

CWE-119

Summary

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 
execute code.

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 
affected system.

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:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160210-asa-ike

Affected Products

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...

More...

Workarounds

There are no workarounds that address this vulnerability.

Fixed Software

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:

http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html

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 
solution.

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):

http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html

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.

Fixed Releases

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[1]				Affected; migrate to 9.1(7) or later

8.2[1]				Affected; migrate to 9.1(7) or later

8.3[1]				Affected; migrate to 9.1(7) or later

8.4 				8.4(7.30)

8.5[1]				Not affected

8.6[1]				Affected; migrate to 9.1(7) or later

8.7 				8.7(1.18)

9.0				9.0(4.38)

9.1 				9.1(7)

9.2 				9.2(4.5) 

9.3 				9.3(3.7) 

9.4 				9.4(2.4)

9.5 				9.5(2.2) 

[1]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.

Source

This vulnerability was reported to Cisco by David Barksdale, Jordan 
Gruskovnjak, and Alex Wheeler of Exodus Intelligence.

URL

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160210-asa-ike

Revision History

Version Description Section Status Date

1.0 Initial public release Final 2016-February-10

Legal Disclaimer

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.

- --------------------------END INCLUDED TEXT--------------------

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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
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