Cisco has released free software updates that address the vulnerability described in this advisory. Customers may only install and expect support for software versions and feature sets for which they have purchased a license. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license:
Additionally, customers may only download software for which they have a valid license, procured from Cisco directly, or through a Cisco authorized reseller or partner. In most cases this will be a maintenance upgrade to software that was previously purchased. Free security software updates do not entitle customers to a new software license, additional software feature sets, or major revision upgrades.
When considering software upgrades, customers are advised to consult the Cisco Security Advisories and Responses archive at http://www.cisco.com/go/psirt
and review subsequent advisories to determine exposure and a complete upgrade solution.
In all cases, customers should ensure that the devices to upgrade contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco Technical Assistance Center (TAC):
Customers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade.
This vulnerability has been corrected in Cisco IOS XR Software Release 5.3.3 for Cisco ASR 9001 Aggregation Services Routers.
This vulnerability has also been corrected in the following Software Maintenance Updates (SMUs) for Cisco IOS XR Software:
- asr9k-px-5.3.2.CSCux26791.pie for Releases 5.3.x
- asr9k-px-5.2.4.CSCux26791.pie for Releases 5.2.x
- asr9k-px-5.1.3.CSCux26791.pie for Releases 5.1.x
Note that Cisco IOS XR Software Releases 6.0.x are not affected by this vulnerability.
Customers are advised to upgrade to an appropriate release or install an appropriate SMU as indicated in this section.