Configuring a Custom Group Based on a Stack Number.Backing Up Files after Loss of Connection.Download Management for Non-Smart Install Clients.Download Management for Smart Install Clients.Configuring Additional Smart Install Management VLANs.Configuring a Group for Standalone Catalyst 4500 Series Switch.On-Demand Upgrade for Catalyst 4500 Series Switch IBC.Configure a Script for the Built-in Group Mode.Configure a Script for Custom Group Mode.Third-Party, Non-Cisco IOS Device as the TFTP Server.This section includes some basic scenarios and tasks that you might configure in a Smart Install network. Using Custom Groups to Configure Groups Based on Connectivity, MAC Address, Stack Number, or Product IDĬonfiguration Guidelines and Recommendations.If the startup configuration fails to download, the client can go into an infinite loop because there is no startup configuration to update. When performing a zero-touch update, you should always update both the image and the startup configuration files.The only way to recover from the loop is to press Enter when the client is coming up after a reload so that the update process stops. The Smart Install client feature in Cisco IOS and IOS XE Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a memory leak and eventual denial of service (DoS) condition on an affected device.To update only the image or only the configuration file, use the vstack download-image or vstack download-config privileged EXEC commands for an on-demand download instead.To update only the image or only the configuration file, use the vstack download-image or vstack download-config privileged EXEC commands for an on-demand download instead. The vulnerability is due to incorrect handling of image list parameters. A successful exploit could cause a Cisco Catalyst switch to leak memory and eventually reload, resulting in a DoS condition.Ĭisco has released software updates that address this vulnerability.Īn attacker could exploit this vulnerability by sending crafted Smart Install packets to TCP port 4786. This advisory is available at the following link: There are no workarounds that address this vulnerability other than disabling Smart Install functionality on the affected device. 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. This vulnerability affects Cisco devices that are running a vulnerable release of Cisco IOS Software or Cisco IOS XE Software with the Smart Install client feature enabled.įor information about which Cisco IOS and IOS XE Software releases are vulnerable, see the Fixed Software section of this advisory. Smart Install client functionality is enabled by default on Cisco IOS switches. ![]() Release 12.2(52)SE are not Smart Install capable, but they can be Smart Switches running releases earlier than Cisco IOS SoftwareĬisco devices that are configured as a Smart Install director are not affected by this vulnerability. Install clients if they support the archive download-sw privileged EXEC command. To determine whether a device is configured with the Smart Install client feature enabled, use the show vstack config privileged EXEC command on the Smart Install client. The following is the output of the show vstack config command in a Cisco Catalyst Switch configured as a Smart Install client.
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