Vulnerability Details CVE-2021-20233
A flaw was found in grub2 in versions prior to 2.06. Setparam_prefix() in the menu rendering code performs a length calculation on the assumption that expressing a quoted single quote will require 3 characters, while it actually requires 4 characters which allows an attacker to corrupt memory by one byte for each quote in the input. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 52.0%
CVSS Severity
CVSS v3 Score 8.2
CVSS v2 Score 7.2
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1926263
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/
- https://security.gentoo.org/glsa/202104-05
- https://security.netapp.com/advisory/ntap-20220325-0001/
- https://bugzilla.redhat.com/show_bug.cgi?id=1926263
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/
- https://security.gentoo.org/glsa/202104-05
- https://security.netapp.com/advisory/ntap-20220325-0001/
Products affected by CVE-2021-20233
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cpe:2.3:a:gnu:grub2:-
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cpe:2.3:a:gnu:grub2:1.98
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cpe:2.3:a:gnu:grub2:1.99
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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:netapp:ontap_select_deploy_administration_utility:-
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cpe:2.3:o:fedoraproject:fedora:33
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cpe:2.3:o:fedoraproject:fedora:34
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cpe:2.3:o:redhat:enterprise_linux:7.0
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cpe:2.3:o:redhat:enterprise_linux:8.0
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cpe:2.3:o:redhat:enterprise_linux_server_aus:7.2
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cpe:2.3:o:redhat:enterprise_linux_server_aus:7.3
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cpe:2.3:o:redhat:enterprise_linux_server_aus:7.4
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cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6
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cpe:2.3:o:redhat:enterprise_linux_server_aus:7.7
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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_eus:7.6
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cpe:2.3:o:redhat:enterprise_linux_server_eus:7.7
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cpe:2.3:o:redhat:enterprise_linux_server_eus:8.1
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cpe:2.3:o:redhat:enterprise_linux_server_tus:7.4
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cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6
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cpe:2.3:o:redhat:enterprise_linux_server_tus:7.7
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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_workstation:7.0