Secure boot bypass in Cisco IOS XR

1) Incorrect permission assignment for critical resource

EUVDB-ID: #VU94090

Risk: Low

CVSSv3.1: 5.8 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2024-20456

CWE-ID: CWE-732 - Incorrect Permission Assignment for Critical Resource

Exploit availability: No

Description

The vulnerability allows a local user to bypass secure boot protections.

The vulnerability exists due to an error in the software build process. A local user can bypass the Cisco Secure Boot functionality and load unverified software on an affected device.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco IOS XR: 24.2.1

CPE2.3

• cpe:2.3:o:cisco_systems:cisco_ios_xr:24.2.1:*:*:*:*:*:*:*

External links

http://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xr-secure-boot-quD5g8Ap
http://bst.cloudapps.cisco.com/bugsearch/bug/CSCwk58609

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.