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ESB-2016.0641 - [Cisco] Cisco ASA 5500 Series CSC-SSM devices : Denial of service - Remote/unauthenticated

Date: 10 March 2016

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.0641
         Cisco ASA Content Security and Control Security Services
                  Module Denial of Service Vulnerability
                               10 March 2016

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Cisco ASA 5500 Series CSC-SSM devices
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-1312  

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160309-csc

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

Cisco Security Advisory

Cisco ASA Content Security and Control Security Services Module Denial of 
Service Vulnerability

High

Advisory ID: cisco-sa-20160309-csc

Published: 2016 March 9 16:00 GMT

Version 1.0: Final

CVSS Score:

Base - 7.8

Workarounds:

No workarounds available

Cisco Bug IDs:

CSCue76147

CVE-2016-1312

CWE-119

Summary

A vulnerability in the HTTPS inspection engine of the Cisco ASA Content 
Security and Control Security Services Module (CSC-SSM) could allow an 
unauthenticated, remote attacker to cause exhaustion of available memory, 
system instability, and a reload of the affected system.

The vulnerability is due to improper handling of HTTPS packets transiting 
through the affected system. An attacker could exploit this vulnerability by 
sending HTTPS packets through the affected system at high rate.

Cisco has released software updates that address this vulnerability. 
Workarounds that mitigate this vulnerability are not available.

This advisory is available at the following link: 
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160309-csc

Affected Products

Vulnerable Products

Cisco ASA 5500 Series CSC-SSM devices running any 6.6 software release prior 
to 6.6.1164.0 or without hotfix 1157 are affected by this vulnerability.

Cisco ASA 5500 Series CSC-SSM devices running software version 6.1, 6.2, or 
6.3 are not affected by this vulnerability because these software versions do
not support HTTPS inspection.

Products Confirmed Not Vulnerable

Cisco ASA Software is not affected by this vulnerability.

No other Cisco products are currently known to be affected by this 
vulnerability.

Show Less

 Workarounds

Workarounds are not available.

Fixed Software

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 be upgraded 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.

Cisco ASA 5500 Series CSC-SSM software versions 6.6.1164.0 and later include 
the fix for this vulnerability. Alternatively, affected customers can install
hotfix 1157, which is available by contacting Cisco TAC.

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 found during the resolution of support cases.

URL

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160309-csc

Revision History

Version 	Description 		Section 	Status 		Date

1.0 		Initial public release 			Final 		2016-March-09

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
Facsimile:      (07) 3365 7031
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