CVE-2021-3695

 

Published at: - 06-07-2022 06:15

Last modified: - 24-10-2022 03:08

Total changes: - 5

Description

A crafted 16-bit grayscale PNG image may lead to a out-of-bounds write in the heap area. An attacker may take advantage of that to cause heap data corruption or eventually arbitrary code execution and circumvent secure boot protections. This issue has a high complexity to be exploited as an attacker needs to perform some triage over the heap layout to achieve signifcant results, also the values written into the memory are repeated three times in a row making difficult to produce valid payloads. This flaw affects grub2 versions prior grub-2.12.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L

 

Verification logic

 

Reference

• https://bugzilla.redhat.com/show_bug.cgi?id=1991685
• GLSA-202209-12-
• https://security.netapp.com/advisory/ntap-20220930-0001/

 

Keywords

NVD

 

CVE-2021-3695

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures