Cisco IOS XR Software vulnerability

What happened

A vulnerability in the installation process of Cisco IOS XR Software could allow an authenticated, local attacker to bypass Cisco IOS XR Software image signature verification and load unsigned software on an affected device. To exploit this vulnerability, the attacker must have root-system privileges on the affected device. This vulnerability is due to incomplete validation of files during the installation of an .iso file. An attacker could exploit this vulnerability by modifying contents of the .iso image and then installing and activating it on the device. A successful exploit could allow the attacker to load an unsigned file as part of the image activation process.

Affected versions

Cisco IOS XR Software: 6.5.3; 6.5.29; 6.5.1; 6.6.1; 6.5.2; 6.5.92; 6.5.15; 6.6.2; 7.0.1; 6.6.25; 6.5.26; 6.6.11; 6.5.25; 6.5.28; 6.5.93; 6.6.12; 6.5.90; 7.0.0; 7.1.1; 7.0.90; 6.6.3; 6.7.1; 7.0.2; 7.1.15; 7.2.0; 7.2.1; 7.1.2; 6.7.2; 7.1.25; 6.6.4; 7.3.1; 7.1.3; 6.7.3; 7.4.1; 7.2.2; 6.5.31; 6.8.1; 7.4.15; 6.5.32; 7.3.2; 7.5.1; 7.4.16; 7.3.27; 7.6.1; 7.5.2; 7.6.15; 7.3.3; 7.7.1; 6.8.2; 7.3.4; 7.4.2; 6.7.35; 6.9.1; 7.6.2; 7.8.1; 7.5.3; 7.7.2; 6.9.2; 7.9.1; 7.8.2; 7.5.4; 6.5.33; 7.8.22; 7.10.1; 7.7.21; 7.9.2; 7.3.5; 7.5.5; 7.11.1; 7.9.21; 7.10.2; 7.6.3; 24.1.1; 7.3.6; 7.11.2; 24.2.1; 24.1.2; 24.2.11; 24.3.1; 24.4.1; 24.2.2; 7.8.23; 7.11.21; 24.2.20; 24.3.2; 24.4.10; 6.5.35; 24.4.15; 6.5.351; 6.5.352 Fixed: See vendor advisory.

Why it matters

Review the vendor advisory and exposure of the affected product to determine operational impact.

Detection & mitigation

• Apply vendor-provided updates or mitigations.
• Review affected product exposure and access logs.