When considering software upgrades, customers are advised to consult the Cisco Security Advisories, Responses, and Alerts 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 be upgraded 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.
The fix, which is available at the time of the advisory publication, is provided in the form of an updater script patch.
This patch is required for all virtual appliance releases for email security, web security, and content security management that were downloaded or upgraded before June 25, 2015.
This patch is not required for physical hardware appliances or for virtual appliance downloads or upgrades after June 25, 2015.
The patch will delete all the preinstalled SSH keys on the appliance. After the key deletion, the patch will also provide customers with additional steps to take for a complete fix.
This patch will be available on all the virtual platforms via the standard upgrade mechanism. The patch appears in the list of upgrades as cisco-sa-20150625-ironport SSH Keys Vulnerability Fix and must be manually installed by using the CLI.
Please refer to the release notes for a complete set of instructions:
Note: All affected images will be removed from the software downloads section of Cisco.com prior to publication of this advisory. WSAv, ESAv, or SMAv images will not be available for download. New images will be loaded in the following days, which will enable existing customers to continue with any planned updates and new customers to perform installations.