medium6.7
CVE-2020-27749
A flaw was found in grub2 in versions prior to 2.06.
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Gnu | Grub2 | before 2.06 |
| Redhat | Enterprise Linux | Versions 7.0, 8.0 |
| Redhat | Enterprise Linux Server Aus | Versions 7.2, 7.3, 7.4, 7.6, 7.7, 8.2 |
| Redhat | Enterprise Linux Server Eus | Versions 7.6, 7.7, 8.1 |
| Redhat | Enterprise Linux Server Tus | Versions 7.4, 7.6, 7.7, 8.2 |
| Redhat | Enterprise Linux Workstation | Version 7.0 |
| Fedoraproject | Fedora | Versions 33, 34 |
| Netapp | Ontap Select Deploy Administration Utility | All versions |
Weakness classification
References
- NVD record
- CVE.org record
- https://bugzilla.redhat.com/show_bug.cgi?id=1899966
- 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=1899966
- 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/