CVE-2021-3695

CVE Details

Release Date:2022-06-07

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.

See more information about CVE-2021-3695 from MITRE CVE dictionary and NIST NVD


CVSS v3.0 metrics


NOTE: The following CVSS v3.0 metrics and score provided are preliminary and subject to review.

Base Score: 7.5 Base Metrics: AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
Access Vector: Local network Attack Complexity: High
Privileges Required: High User Interaction: None
Scope: Changed Confidentiality Impact: High
Integrity Impact: High Availability Impact: High

Errata information


PlatformErrataRelease Date
Oracle Linux version 7 (grub2)ELSA-2022-94692022-06-07
Oracle Linux version 7 (grub2)ELSA-2023-129522023-10-27
Oracle Linux version 8 (grub2)ELSA-2022-94712022-06-07
Oracle Linux version 8 (grub2)ELSA-2022-95952022-07-14
Oracle Linux version 9 (grub2)ELSA-2022-95962022-07-14



This page is generated automatically and has not been checked for errors or omissions. For clarification or corrections please contact the Oracle Linux ULN team

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