Cisco IOS Software Common Industrial Protocol Request Denial of Service Vulnerability

A vulnerability in the Common Industrial Protocol (CIP) feature of Cisco IOS Software could allow an unauthenticated, remote attacker to create a denial of service (DoS) condition.

The vulnerability is due to a failure to properly process an unusual, but valid, set of requests to an affected device. An attacker could exploit this vulnerability by submitting a CIP message request designed to trigger the vulnerability to an affected device. An exploit could cause the switch to stop processing traffic, requiring a restart of the device to regain functionality.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

This advisory is available at the following link:

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160928-cip[“https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160928-cip”]

This advisory is part of the September 28, 2016, release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication, which includes 10 Cisco Security Advisories that describe 11 vulnerabilities. All the vulnerabilities have a Security Impact Rating of “High.” For a complete list of the advisories and links to them, see Cisco Event Response: September 2016 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication[“https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-56513”].