Integer underflow in grub - CVE-2021-3697
Published: June 8, 2022 / Updated: July 20, 2022
Vulnerability identifier: #VU64061
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2021-3697
CWE-ID: CWE-191
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: GNU
Affected software:
grub
grub
Detailed vulnerability description
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to integer underflow within the JPEG reader. A local privileged user can trigger an integer underflow and bypass secure boot protection mechanism.
How to mitigate CVE-2021-3697
Install updates from vendor's website.