CVE-2021-3695
Medium
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.
SeverityMedium
CVSS4.5
Exploit probability—
Product
Gnu Grub2
PublishedJul 6, 2022
First seenJul 6, 2022
Weakness typeCWE-787Out-of-bounds write
How to fix
Update
- gnu grub22.12 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| gnu grub2 | 2.00 ≤ v < 2.12 | 2.12 |
| fedoraproject fedora | 36 | — |
| redhat developer_tools | 1.0 | — |
| redhat openshift | 3.0 | — |
| redhat enterprise_linux | 8.0, 8.1, 8.4, 9.0 | — |
| redhat enterprise_linux_eus | 8.2, 8.4, 8.6, 9.0 | — |
| redhat enterprise_linux_for_power_little_endian | 8.0, 9.0 | — |
| redhat enterprise_linux_for_power_little_endian_eus | 8.2, 8.4, 8.6, 9.0 | — |
| redhat enterprise_linux_server_aus | 8.2, 8.4, 8.6 | — |
| redhat enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions | 8.1, 8.2, 8.4, 8.6, 9.0 | — |
| redhat enterprise_linux_server_tus | 8.2, 8.4, 8.6 | — |
| redhat openshift_container_platform | 4.6, 4.9, 4.10 | — |
| redhat codeready_linux_builder | No range specified | — |
| netapp ontap_select_deploy_administration_utility | No range specified | — |
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