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Vulnerability Details : 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.
Publish Date : 2021-03-03 Last Update Date : 2021-05-01
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- CVSS Scores & Vulnerability Types

CVSS Score
7.2
Confidentiality Impact Complete (There is total information disclosure, resulting in all system files being revealed.)
Integrity Impact Complete (There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the entire system being compromised.)
Availability Impact Complete (There is a total shutdown of the affected resource. The attacker can render the resource completely unavailable.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s)
CWE ID 787

- Related OVAL Definitions

Title Definition Id Class Family
RHSA-2021:0696: grub2 security update (Moderate) oval:com.redhat.rhsa:def:20210696 unix
RHSA-2021:0699: grub2 security update (Moderate) oval:com.redhat.rhsa:def:20210699 unix
RHSA-2021:1734: shim security update (Moderate) oval:com.redhat.rhsa:def:20211734 unix
RHSA-2021:2566: fwupd security update (Moderate) oval:com.redhat.rhsa:def:20212566 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2021-20233

# Product Type Vendor Product Version Update Edition Language
1 OS Fedoraproject Fedora 33 * * * Version Details Vulnerabilities
2 Application GNU Grub2 * * * * Version Details Vulnerabilities
3 OS Redhat Enterprise Linux 7.0 * * * Version Details Vulnerabilities
4 OS Redhat Enterprise Linux 8.0 * * * Version Details Vulnerabilities
5 OS Redhat Enterprise Linux Server Aus 7.2 * * * Version Details Vulnerabilities
6 OS Redhat Enterprise Linux Server Aus 7.3 * * * Version Details Vulnerabilities
7 OS Redhat Enterprise Linux Server Aus 7.4 * * * Version Details Vulnerabilities
8 OS Redhat Enterprise Linux Server Aus 7.6 * * * Version Details Vulnerabilities
9 OS Redhat Enterprise Linux Server Aus 7.7 * * * Version Details Vulnerabilities
10 OS Redhat Enterprise Linux Server Aus 8.2 * * * Version Details Vulnerabilities
11 OS Redhat Enterprise Linux Server Eus 7.6 * * * Version Details Vulnerabilities
12 OS Redhat Enterprise Linux Server Eus 7.7 * * * Version Details Vulnerabilities
13 OS Redhat Enterprise Linux Server Eus 8.1 * * * Version Details Vulnerabilities
14 OS Redhat Enterprise Linux Server Tus 7.4 * * * Version Details Vulnerabilities
15 OS Redhat Enterprise Linux Server Tus 7.6 * * * Version Details Vulnerabilities
16 OS Redhat Enterprise Linux Server Tus 7.7 * * * Version Details Vulnerabilities
17 OS Redhat Enterprise Linux Server Tus 8.2 * * * Version Details Vulnerabilities
18 OS Redhat Enterprise Linux Workstation 7.0 * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Fedoraproject Fedora 1
GNU Grub2 1
Redhat Enterprise Linux 2
Redhat Enterprise Linux Server Aus 6
Redhat Enterprise Linux Server Eus 3
Redhat Enterprise Linux Server Tus 4
Redhat Enterprise Linux Workstation 1

- References For CVE-2021-20233

https://security.gentoo.org/glsa/202104-05
GENTOO GLSA-202104-05
https://bugzilla.redhat.com/show_bug.cgi?id=1926263
https://lists.fedoraproject.org/archives/list/[email protected]/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/
FEDORA FEDORA-2021-cab258a413

- Metasploit Modules Related To CVE-2021-20233

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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