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.
History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published: 2022-07-06T15:06:38

Updated: 2024-08-03T17:01:08.290Z

Reserved: 2021-08-10T00:00:00

Link: CVE-2021-3695

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2022-07-06T16:15:08.210

Modified: 2024-11-21T06:22:10.483

Link: CVE-2021-3695

cve-icon Redhat

Severity : Moderate

Publid Date: 2022-06-07T00:00:00Z

Links: CVE-2021-3695 - Bugzilla