Out-of-bounds write in grub - CVE-2021-3695
Published: June 8, 2022 / Updated: July 20, 2022
Vulnerability identifier: #VU64057
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2021-3695
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: GNU
Affected software:
grub
grub
Detailed vulnerability description
The vulnerability allows a local privileged user to bypass implemented security restrictions.
The vulnerability exists due to a boundary error when processing PNG grayscale images. A local privileged user can pass specially crafted PNG image to the application, trigger an out-of-bounds write error and potentially bypass secure boot protection mechanism.
How to mitigate CVE-2021-3695
Install updates from vendor's website.