Improper Verification of Cryptographic Signature in Cisco IOS XR Software

1) Improper Verification of Cryptographic Signature

EUVDB-ID: #VU80773

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-2023-20236

CWE-ID: CWE-347 - Improper Verification of Cryptographic Signature

Exploit availability: No

Description

The vulnerability allows a local user to compromise the target system.

The vulnerability exists due to insufficient image verification in the iPXE boot function. A local administrator can boot an unverified software image on the target device.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco IOS XR: 7.9 - 7.10

Cisco 8000 Series Routers: All versions

Cisco ASR 9000 Series Aggregation Services Routers: All versions

Cisco Network Convergence System 1000 Series: All versions

NCS 4000: All versions

NCS 5000: All versions

NCS540: All versions

NCS5500: All versions

NCS560: All versions

NCS 5700 Series Routers: All versions

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-ipxe-sigbypass-pymfyqgB

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.