Vulnerability Details CVE-2021-3695
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 18.8%
CVSS Severity
CVSS v3 Score 4.5
CVSS v2 Score 4.4
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1991685
- https://security.gentoo.org/glsa/202209-12
- https://security.netapp.com/advisory/ntap-20220930-0001/
- https://bugzilla.redhat.com/show_bug.cgi?id=1991685
- https://security.gentoo.org/glsa/202209-12
- https://security.netapp.com/advisory/ntap-20220930-0001/
Products affected by CVE-2021-3695
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cpe:2.3:a:gnu:grub2:2.00
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cpe:2.3:a:gnu:grub2:2.01
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cpe:2.3:a:gnu:grub2:2.02
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cpe:2.3:a:gnu:grub2:2.04
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cpe:2.3:a:gnu:grub2:2.06
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cpe:2.3:a:gnu:grub2:2.06-150400.7.1
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cpe:2.3:a:gnu:grub2:2.06-18.1
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cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-
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cpe:2.3:a:redhat:codeready_linux_builder:-
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cpe:2.3:a:redhat:developer_tools:1.0
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cpe:2.3:a:redhat:openshift:3.0
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cpe:2.3:a:redhat:openshift_container_platform:4.10
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cpe:2.3:a:redhat:openshift_container_platform:4.6
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cpe:2.3:a:redhat:openshift_container_platform:4.9
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cpe:2.3:o:fedoraproject:fedora:36
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cpe:2.3:o:redhat:enterprise_linux:8.0
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cpe:2.3:o:redhat:enterprise_linux:8.1
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cpe:2.3:o:redhat:enterprise_linux:8.4
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cpe:2.3:o:redhat:enterprise_linux:9.0
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cpe:2.3:o:redhat:enterprise_linux_eus:8.2
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cpe:2.3:o:redhat:enterprise_linux_eus:8.4
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cpe:2.3:o:redhat:enterprise_linux_eus:8.6
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cpe:2.3:o:redhat:enterprise_linux_eus:9.0
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cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:8.0
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cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:9.0
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cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus:8.2
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cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus:8.4
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cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus:8.6
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cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus:9.0
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cpe:2.3:o:redhat:enterprise_linux_server_aus:8.2
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cpe:2.3:o:redhat:enterprise_linux_server_aus:8.4
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cpe:2.3:o:redhat:enterprise_linux_server_aus:8.6
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Redhat » Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions » Version: 8.1cpe:2.3:o:redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions:8.1
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Redhat » Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions » Version: 8.2cpe:2.3:o:redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions:8.2
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Redhat » Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions » Version: 8.4cpe:2.3:o:redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions:8.4
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Redhat » Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions » Version: 8.6cpe:2.3:o:redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions:8.6
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Redhat » Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions » Version: 9.0cpe:2.3:o:redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions:9.0
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cpe:2.3:o:redhat:enterprise_linux_server_tus:8.2
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cpe:2.3:o:redhat:enterprise_linux_server_tus:8.4
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cpe:2.3:o:redhat:enterprise_linux_server_tus:8.6