Description
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.
Published: 2021-03-03
Score: 6.7 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

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Tracking

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Advisories
Source ID Title
Debian DSA Debian DSA DSA-4867-1 grub2 security update
EUVD EUVD EUVD-2020-20253 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.
Ubuntu USN Ubuntu USN USN-4992-1 GRUB 2 vulnerabilities
History

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Subscriptions

Fedoraproject Fedora
Gnu Grub2
Netapp Ontap Select Deploy Administration Utility
Redhat Enterprise Linux Enterprise Linux Server Aus Enterprise Linux Server Eus Enterprise Linux Server Tus Enterprise Linux Workstation Rhel Aus Rhel E4s Rhel Eus Rhel Tus
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2024-08-04T16:18:45.656Z

Reserved: 2020-10-27T00:00:00.000Z

Link: CVE-2020-27749

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2021-03-03T17:15:11.787

Modified: 2024-11-21T05:21:45.340

Link: CVE-2020-27749

cve-icon Redhat

Severity : Moderate

Publid Date: 2021-03-02T18:00:00Z

Links: CVE-2020-27749 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses