#VU50380 Improper Verification of Cryptographic Signature in Cisco Systems, Inc products - CVE-2021-1244
Published: February 4, 2021 / Updated: February 5, 2021
Vulnerability identifier: #VU50380
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2021-1244
CWE-ID: CWE-347
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
Cisco Network Convergence System 5000 Series
Cisco 8000 Series Routers
Cisco ASR 9000 Series Aggregation Services Routers
Cisco Network Convergence System 5000 Series
Cisco 8000 Series Routers
Cisco ASR 9000 Series Aggregation Services Routers
Software vendor:
Cisco Systems, Inc
Cisco Systems, Inc
Description
The vulnerability allows a local user to bypass implemented security restrictions.
Multiple vulnerabilities in Cisco Network Convergence System (NCS) 540 Series Routers, only when running Cisco IOS XR NCS540L software images, and Cisco IOS XR Software for the Cisco 8000 Series Routers due to an unlocked version of GRUB boot loader on an affected device. Unsigned script within the ISO image is not verified during system upgrade before it is executed. A local user can modifying the boot process from the GRUB menu and bypass the boot chain of trust.
Remediation
Install updates from vendor's website.