high
7.2
CWE
121 787
Advisory Published
CVE Published
Updated

CVE-2020-27749

First published: Fri Nov 20 2020(Updated: )

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.

Credit: secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
redhat/grub<2.06
2.06
Gnu Grub2<2.06
Redhat Enterprise Linux=7.0
Redhat Enterprise Linux=8.0
Redhat Enterprise Linux Server Aus=7.2
Redhat Enterprise Linux Server Aus=7.3
Redhat Enterprise Linux Server Aus=7.4
Redhat Enterprise Linux Server Aus=7.6
Redhat Enterprise Linux Server Aus=7.7
Redhat Enterprise Linux Server Aus=8.2
Redhat Enterprise Linux Server Eus=7.6
Redhat Enterprise Linux Server Eus=7.7
Redhat Enterprise Linux Server Eus=8.1
Redhat Enterprise Linux Server Tus=7.4
Redhat Enterprise Linux Server Tus=7.6
Redhat Enterprise Linux Server Tus=7.7
Redhat Enterprise Linux Server Tus=8.2
Redhat Enterprise Linux Workstation=7.0
Fedoraproject Fedora=33
Fedoraproject Fedora=34
NetApp ONTAP Select Deploy administration utility

Remedy

https://bugzilla.redhat.com/show_bug.cgi?id=1899966

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Reference Links

Frequently Asked Questions

  • What is CVE-2020-27749?

    CVE-2020-27749 is a vulnerability found in grub2 versions prior to 2.06.

  • What is the severity of CVE-2020-27749?

    CVE-2020-27749 has a severity level of high.

  • How does CVE-2020-27749 affect the affected software?

    CVE-2020-27749 affects the grub2 package in Redhat Enterprise Linux, Gnu Grub2, and other related products.

  • How can I fix CVE-2020-27749?

    To fix CVE-2020-27749, update the grub2 package to version 2.06 or higher.

  • Where can I find more information about CVE-2020-27749?

    You can find more information about CVE-2020-27749 in the following references: [Red Hat Bugzilla](https://bugzilla.redhat.com/show_bug.cgi?id=1899966), [Fedora Project](https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/), [Gentoo Security](https://security.gentoo.org/glsa/202104-05).

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