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             AUSCERT External Security Bulletin Redistribution

                               ESB-2013.0604
  Cisco Nexus 7000 Frame Forwarding Loop Denial of Service Vulnerability
                               30 April 2013

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

Product:           Cisco Nexus 7000
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2013-1226  

Original Bulletin: 
   http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-1226

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Cisco Security Notice

Cisco Nexus 7000 Frame Forwarding Loop Denial of Service Vulnerability

http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-1226

CVE ID: CVE-2013-1226

Release Date: 2013 April 25 20:12  UTC (GMT)

Last Updated: 2013 April 25 20:12  UTC (GMT)

Summary

A vulnerability in the Ethernet frame forwarding code of the Cisco Nexus 7000 
Series Switch could allow an unauthenticated, adjacent attacker to cause a 
frame forwarding loop that that may saturate all interswitch links and affect
all services on the switch, causing a network outage.

The vulnerability is due to mishandling of a specific type of non-standard
Ethernet frames, which, once received, are replicated to all links. An attacker 
could exploit this vulnerability by sending a crafted, non-standard Ethernet 
frame.

Affected Products

Product			More Information	CVSS
Cisco NX-OS Software	CSCug47098		6.1/5.5

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/en/US/products/products_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.

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