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ESB-2014.1206 - [Appliance] Cisco Adaptive Security Appliance (ASA) Software: Denial of service - Existing account

Date: 22 July 2014

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2014.1206
     Cisco ASA CIFS Share Enumeration Denial of Service Vulnerability
                               22 July 2014

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

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

Product:           Cisco Adaptive Security Appliance (ASA) Software
Publisher:         Cisco Systems
Operating System:  Network Appliance
Impact/Access:     Denial of Service -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2013-6691  

Original Bulletin: 
   http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-6691

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

Cisco Security Notice

Cisco ASA CIFS Share Enumeration Denial of Service Vulnerability

http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-6691

CVE ID: CVE-2013-6691

Release Date: 2014 July 11 21:45 UTC (GMT)

Last Updated: 2014 July 14 13:06 UTC (GMT)

Related Documents:

Summary

A vulnerability in the WebVPN Common Internet File System (CIFS) access 
function of Cisco Adaptive Security Appliance (ASA) could allow an 
authenticated, remote attacker to trigger a reload of the affected device.

The vulnerability is due to missing bounds checks on the response received 
from the CIFS server when enumerating available shares. An attacker could 
exploit this vulnerability by attempting to attain the list of shares from 
CIFS servers that offer a large number of shares. Controlling a CIFS server 
may also aid the attacker. An exploit could allow the attacker to trigger a 
reload of the Cisco ASA, resulting in a denial of service (DoS) condition.

Affected Products

Product 			More Information 	CVSS

Cisco Adaptive Security 	CSCuj83344 		6.8/5.0 
Appliance (ASA) Software

What Is a Cisco Security Notice?

The Cisco Product Security Incident Response Team (PSIRT) publishes Cisco 
Security Notices to inform customers of low- to mid-level severity security 
issues involving Cisco products.

Customers who wish to upgrade to a software version that includes fixes for 
these issues should contact their normal support channels. Free software 
updates will not be provided for issues that are disclosed through a Cisco 
Security Notice.

For additional information about Cisco PSIRT publications, see the Cisco 
Security Vulnerability Policy at 
http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html

Customers Using Third-Party Support Organizations

Customers may have Cisco products that are provided or maintained through 
prior or existing agreements with third-party support organizations, such as 
Cisco Partners, authorized resellers, or service providers. For these 
products, customers should consult their service providers or support 
organizations to ensure that any applied workaround or fix is the most 
appropriate in the intended network before it is deployed.

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 stand-alone 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.

- --------------------------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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===========================================================================
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