HIGH 8.2 Microsoft
CVE-2021-20233
A flaw was found in grub2 in versions prior to 2.06. Setparam_prefix() in the menu rendering code performs a length calculation on the assumption that expressing a quoted single quote will require 3 characters while it actually requires 4 characters which allows an attacker to corrupt memory by one byte for each quote in the input. 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. Setparam_prefix() in the menu rendering code performs a length calculation on the assumption that expressing a quoted single quote will require 3 characters while it actually requires 4 characters which allows an attacker to corrupt memory by one byte for each quote in the input. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Affected Products
- azl3 grub2 2.06-26 on Azure Linux 3.0
- cbl2 grub2 2.06~rc1-7 on CBL Mariner 2.0
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-20233
- https://nvd.nist.gov/vuln/detail/CVE-2021-20233
This high severity vulnerability with a CVSS score of 8.2 was published on 2021-03-09 via Microsoft. Affected: azl3 grub2 2.06-26 on Azure Linux 3.0, cbl2 grub2 2.06~rc1-7 on CBL Mariner 2.0.
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