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In the context of ensuring the authenticity of Cisco IOS software images used in the network, change control is relevant because it helps greatly when determining which changes have been authorized and which are unauthorized.

Reload the Cisco IOS device to place the new software into service.Ĭhange control is a mechanism through which changes being made to network devices are requested, approved, implemented, and audited.

Modify the configuration of the Cisco IOS device to load the new Cisco IOS software image upon startup.

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Verify the MD5 hash of the Cisco IOS software image on the Cisco IOS device using the procedures detailed in the Image File Information Using IOS Upgrade Planner section.

Transfer the Cisco IOS software image from the file server to the Cisco IOS device using a secure protocol that provides both authentication and encryption.

Relocate the read-only media to the file server that is used for Cisco IOS software image distribution to Cisco IOS devices.

Remove the local file on the administrative workstation.

Verify the MD5 hash of the file written to the read-only media to detect corruption during the copy process.

Once the Cisco IOS software image file has been verified as authentic and unaltered, copy it to write-once media or media that can be rendered as read-only after the image has been written.

Once the image has been downloaded to an administrative workstation, the MD5 hash of the local file should be verified against the hash presented by the Cisco IOS Upgrade Planner.

When downloading a Cisco IOS software image from record the MD5 hash as presented by the Cisco IOS Upgrade Planner tool.

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This secure process must be used from the time a Cisco IOS software image is downloaded from until a Cisco IOS device begins using it.Īlthough processes may vary based on the network and its security and change management requirements, the following procedure represents an example of best practices that may help minimize the possibility of malicious code installation. To minimize the risk associated with malicious code, it is important that network administrators develop and consistently apply a secure methodology for Cisco IOS software image management. These practices are particularly relevant to ensure that Cisco IOS devices only use authorized and unaltered Cisco IOS software images. Additionally, this document will offer some methods that administrators can use to mitigate the risks of introducing malicious code into the network.Ĭisco recommends that the following security best practices be implemented to improve the security posture of the network. This document will describe best practices that network administrators can use to reduce the risk of malicious code being installed on Cisco IOS devices. This attack scenario could occur on any device that uses a form of software, given a proper set of circumstances. It may be possible for an attacker to insert malicious code into a Cisco IOS software image and load it onto a Cisco device that supports that image. Further details are documented in the Cisco Security Vulnerability Policy. Depending on severity, security issues in Cisco IOS software are communicated to customers using Security Advisories, Security Responses, or Cisco bug release notes.

The integrity of the software used on Cisco IOS devices, in this case Cisco IOS software, is also important to device security. The document entitled Cisco Guide to Harden Cisco IOS Devices represents one collection of those best practices. The security configuration of a device, specifically in relation to device security, is conveyed using documented best practices.

The security of Cisco IOS devices consists of multiple factors, including physical and logical access to the device, configuration of the device, and the inherent security of the software being used. Image File Information Using Cisco IOS Upgrade Planner

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Using the Image Verification Cisco IOS verify Commandĭownloading an Image File from a Cisco IOS Device Leverage Centralized and Comprehensive Logging Leverage Authentication, Authorization, and Accounting