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ESB-2014.0961 - [Cisco] Cisco NX-OS: Denial of service - Remote/unauthenticated

Date: 12 June 2014

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2014.0961
 Cisco NX-OS Software HSRP Authentication Denial of Service Vulnerability
                               12 June 2014

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

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

Product:           Cisco NX-OS
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2014-3295  

Original Bulletin: 
   http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2014-3295

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

Cisco Security Notice

Cisco NX-OS Software HSRP Authentication Denial of Service Vulnerability

http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2014-3295

CVE ID: CVE-2014-3295

Release Date: 2014 June 10 22:13 UTC (GMT)

Last Updated: 2014 June 11 18:29 UTC (GMT)

Related Documents:

Summary

A vulnerability in Hot Standby Router Protocol (HSRP) authentication in the 
Cisco Nexus series could allow an unauthenticated, adjacent attacker to affect
the state of HSRP group members and cause black holing of traffic.

The vulnerability is due to incorrect parsing of malformed HSRP packets. An 
attacker could exploit this vulnerability by sending malformed HSRP packets to
bypass HSRP authentication. An exploit could allow the attacker to bypass HSRP
authentication and affect the state of active HSRP group members, causing them
to go to SPEAK state, which leads to black holing of traffic and causes a 
denial of service (DoS) condition.

Affected Products

Product 		More Information 	CVSS

Cisco NX-OS Software 	CSCup11309 		4.8/4.6

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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