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.
Metrics
Affected Vendors & Products
References
History
No history.
MITRE
Status: PUBLISHED
Assigner: redhat
Published: 2021-03-03T16:40:30
Updated: 2024-08-04T16:18:45.656Z
Reserved: 2020-10-27T00:00:00
Link: CVE-2020-27749
Vulnrichment
No data.
NVD
Status : Modified
Published: 2021-03-03T17:15:11.787
Modified: 2024-11-21T05:21:45.340
Link: CVE-2020-27749
Redhat