Cisco IOS XR Software Image Verification Bypass Vulnerability Allowing Unverified Software Installation

A vulnerability exists in the boot process of Cisco IOS XR Software, allowing an authenticated local attacker with root-system privileges to bypass image signature verification and load unverified software on the device. This issue arises from incomplete validation of files during the boot process, enabling manipulation of system configuration options to bypass integrity checks. Exploitation could result in control over the boot configuration, allowing the attacker to disregard the requirement for Cisco-signed images or modify the security properties of the active system.

Impact

Exploitation of this vulnerability could lead to the installation of unverified software, potentially allowing for unauthorized control or modification of the device's operating system and functions.

Reproduction

The vulnerability can be reproduced by an authenticated local user with root-system privileges who manipulates the system configuration to bypass integrity checks in the boot process. This can be done by exploiting the incomplete validation of files in the boot verification process, although specific technical details of the manipulation are not provided.

Remediation

Cisco has released software updates that address this vulnerability. Customers with service contracts should obtain these updates through their usual channels. For those without service contracts, contact the Cisco Technical Assistance Center (TAC) for assistance.