HIGH 7.5 Microsoft
CVE-2020-27779
A flaw was found in grub2 in versions prior to 2.06. The cutmem command does not honor secure boot locking allowing an privileged attacker to remove address ranges from memory creating an opportunity to circumvent SecureBoot protections after proper triage about grub's memory layout. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Microsoft Security Update 2021-Mar: A flaw was found in grub2 in versions prior to 2.06. The cutmem command does not honor secure boot locking allowing an privileged attacker to remove address ranges from memory creating an opportunity to circumvent SecureBoot protections after proper triage about grub's memory layout. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Affected Products
- cm1 grub2 2.06~rc1-4 on CBL Mariner 1.0
- cbl2 grub2 2.06~rc1-7 on CBL Mariner 2.0
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-27779
- https://nvd.nist.gov/vuln/detail/CVE-2020-27779
This high severity vulnerability with a CVSS score of 7.5 was published on 2021-03-09 via Microsoft. Affected: cm1 grub2 2.06~rc1-4 on CBL Mariner 1.0, cbl2 grub2 2.06~rc1-7 on CBL Mariner 2.0.
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