CVE-2024-20456

A vulnerability in the boot process of Cisco IOS XR Software could allow an authenticated, local attacker with high privileges to bypass the Cisco Secure Boot functionality and load unverified software on an affected device. To exploit this successfully, the attacker must have root-system privileges on the affected device. This vulnerability is due to an error in the software build process. An attacker could exploit this vulnerability by manipulating the system’s configuration options to bypass some of the integrity checks that are performed during the booting process. A successful exploit could allow the attacker to control the boot configuration, which could enable them to bypass of the requirement to run Cisco signed images or alter the security properties of the running system. It has a CVSS v3.1 base score of 6.7 (MEDIUM).

CVE-2024-20456 has a CVSS v3.1 score of 6.7 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

CVE-2024-20456 affects products from cisco, specifically: 8011-4g24y4h-i, 8101-32fh, 8101-32fh-o, 8101-32h-o, 8102-28fh-dpu-o, 8102-64h, 8102-64h-o, 8111-32eh-o, 8122-64eh-o, 8122-64ehf-o, 8201, 8201-24h8fh, 8201-32fh, 8201-32fh-o, 8202, 8202-32fh-m, 8212-48fh-m, 8404, 8501-sys-mt, 8608, 8700, 8711-32fh-m, 8712-mod-m, 8804, 8808, 8812, 8818, ios_xr, ncs_1010, ncs_1014, ncs_540-12z20g-sys-a, ncs_540-12z20g-sys-d, ncs_540-24q2c2dd-sys, ncs_540-24q8l2dd-sys, ncs_540-24z8q2c-sys, ncs_540-28z4c-sys-a, ncs_540-28z4c-sys-d, ncs_540-6z14s-sys-d, ncs_540-6z18g-sys-a, ncs_540-6z18g-sys-d, ncs_540-acc-sys, ncs_540-fh-agg, ncs_540-fh-csr-sys, ncs_540x-12z16g-sys-a, ncs_540x-12z16g-sys-d, ncs_540x-16z4g8q2c-a, ncs_540x-16z4g8q2c-d, ncs_540x-16z8q2c-d, ncs_540x-4z14g2q-a, ncs_540x-4z14g2q-d, ncs_540x-6z18g-sys-a, ncs_540x-6z18g-sys-d, ncs_540x-8z16g-sys-a, ncs_540x-8z16g-sys-d, ncs_540x-acc-sys, ncs_57b1-5dse-sys, ncs_57b1-6d24-sys, ncs_57c1-48q6-sys, ncs_57d2-18dd-sys. Check the affected products table above for specific version ranges.

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.