CVE-2020-27749
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.
How to fix
- gnu grub22.06 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| gnu grub2 | v < 2.06 | 2.06 |
| redhat enterprise_linux | 7.0, 8.0 | — |
| redhat enterprise_linux_server_aus | 7.2, 7.3, 7.4, 7.6, 7.7, 8.2 | — |
| redhat enterprise_linux_server_eus | 7.6, 7.7, 8.1 | — |
| redhat enterprise_linux_server_tus | 7.4, 7.6, 7.7, 8.2 | — |
| redhat enterprise_linux_workstation | 7.0 | — |
| fedoraproject fedora | 33, 34 | — |
| netapp ontap_select_deploy_administration_utility | No range specified | — |
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