Operating System:

[Cisco]

Published:

29 November 2013

Protect yourself against future threats.

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2013.1711
          Cisco IOS XE Software IP Header Sanity Check Denial of
                           Service Vulnerability
                             29 November 2013

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

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

Product:           Cisco IOS XE Software
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2013-6706  

Original Bulletin: 
   http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-6706

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Cisco Security Notice

Cisco IOS XE Software IP Header Sanity Check Denial of Service Vulnerability

http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-6706

CVE ID: CVE-2013-6706

Release Date: 2013 November 27 22:58  UTC (GMT)

Last Updated: 2013 November 27 22:58  UTC (GMT)

Summary

A vulnerability in the Cisco Express Forwarding processing module that checks 
the sanity of IP headers on Cisco IOS XE Software could allow an 
unauthenticated, remote attacker to cause an affected device to reload, 
leading to a denial of service (DoS) condition.

The vulnerability is due to improper processing of Multiprotocol Label 
Switching (MPLS) packets. When certain additional features are configured, an 
attacker could exploit this vulnerability by sending MPLS packets to traverse 
and exit an affected device as IP packets. An exploit could allow the attacker 
to cause the device to reload, leading to a DoS condition.

Affected Products

Product                 More Information   CVSS

Cisco IOS XE Software   CSCuj23992         5.4/4.5

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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