Cisco Ironport Email Security Appliance (ESA): Denial of Service -- Remote/Unauthenticated

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2014.2490
 Cisco IronPort ESA Subject Header Length Denial of Service Vulnerability
                             22 December 2014

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

Product:           Cisco Ironport Email Security Appliance (ESA)
Publisher:         Cisco Systems
Operating System:  Network Appliance
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2014-8016  

Original Bulletin: 
   http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2014-8016

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Cisco Security Notice

Cisco IronPort ESA Subject Header Length Denial of Service Vulnerability

http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2014-8016

CVE ID: CVE-2014-8016

Release Date: 2014 December 18 15:18 UTC (GMT)

Last Updated: 2014 December 18 15:18 UTC (GMT)

Summary

A vulnerability in Subject header length processing on Cisco IronPort Email 
Security Appliance (ESA) could allow an unauthenticated, remote attacker to 
cause a limited denial of service (DoS) condition on an affected platform.

The vulnerability occurs because the appliance does not limit the length of 
Subject headers sent through the appliance. An attacker could exploit this 
vulnerability by sending multiple crafted messages across the appliance, 
resulting in high CPU utilization. Continued high CPU utilization may cause a
DoS condition on the platform.

Affected Products

Product 					More Information 	CVSS

Cisco IronPort Email Security Appliance		 CSCzv93864 		5.0/4.8

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

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organizations to ensure that any applied workaround or fix is the most 
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