A flaw was found in grub2 in versions prior to 2.06. Variable names present are expanded in the supplied command line into their corresponding variable contents, using a 1kB stack buffer for temporary storage, without sufficient bounds checking. If the function is called with a command line that references a variable with a sufficiently large payload, it is possible to overflow the stack buffer, corrupt the stack frame and control execution which could also circumvent Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
References
| Link | Resource |
|---|---|
| https://bugzilla.redhat.com/show_bug.cgi?id=1899966 | Issue Tracking Patch Third Party Advisory |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/ | |
| https://security.gentoo.org/glsa/202104-05 | Third Party Advisory |
| https://security.netapp.com/advisory/ntap-20220325-0001/ | Third Party Advisory |
Configurations
Configuration 1 (hide)
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Configuration 2 (hide)
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Configuration 3 (hide)
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Configuration 4 (hide)
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History
07 Nov 2023, 03:20
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Information
Published : 2021-03-03 17:15
Updated : 2024-02-28 18:08
NVD link : CVE-2020-27749
Mitre link : CVE-2020-27749
CVE.ORG link : CVE-2020-27749
JSON object : View
Products Affected
redhat
- enterprise_linux
- enterprise_linux_server_eus
- enterprise_linux_server_aus
- enterprise_linux_server_tus
- enterprise_linux_workstation
netapp
- ontap_select_deploy_administration_utility
gnu
- grub2
fedoraproject
- fedora