CVE-2020-15706 Detail

Current Description

GRUB2 contains a race condition in grub_script_function_create() leading to a use-after-free vulnerability which can be triggered by redefining a function whilst the same function is already executing, leading to arbitrary code execution and secure boot restriction bypass. This issue affects GRUB2 version 2.04 and prior versions.


View Analysis Description

Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score matches with CNA score
CNA:  Canonical Ltd.
Base Score:  6.4 MEDIUM
Vector:  CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H


NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: The NVD and the CNA have provided the same score. When this occurs only the CNA information is displayed, but the Acceptance Level icon for the CNA is given a checkmark to signify NVD concurrence.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.html
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.html
http://ubuntu.com/security/notices/USN-4432-1 Third Party Advisory 
http://www.openwall.com/lists/oss-security/2020/07/29/3 Mailing List  Third Party Advisory 
https://access.redhat.com/security/vulnerabilities/grub2bootloader Third Party Advisory 
https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html Issue Tracking  Vendor Advisory 
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011 Third Party Advisory 
https://security.gentoo.org/glsa/202104-05
https://security.netapp.com/advisory/ntap-20200731-0008/ Third Party Advisory 
https://usn.ubuntu.com/4432-1/
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass Third Party Advisory 
https://www.debian.org/security/2020-GRUB-UEFI-SecureBoot Third Party Advisory 
https://www.debian.org/security/2020/dsa-4735 Third Party Advisory 
https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/ Third Party Advisory 
https://www.openwall.com/lists/oss-security/2020/07/29/3 Mailing List  Third Party Advisory 
https://www.suse.com/c/suse-addresses-grub2-secure-boot-issue/ Third Party Advisory 
https://www.suse.com/support/kb/doc/?id=000019673 Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') cwe source acceptance level NIST   Contributor acceptance level Canonical Ltd.  
CWE-416 Use After Free cwe source acceptance level NIST  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

8 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2020-15706
NVD Published Date:
07/29/2020
NVD Last Modified:
04/30/2021
Source:
Canonical Ltd.