Executive Summary

Informations
Name CVE-2020-15706 First vendor Publication 2020-07-29
Vendor Cve Last vendor Modification 2020-08-08

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Overall CVSS Score 6.4
Base Score 6.4 Environmental Score 6.4
impact SubScore 5.9 Temporal Score 6.4
Exploitabality Sub Score 0.5
 
Attack Vector Local Attack Complexity High
Privileges Required High User Interaction None
Scope Unchanged Confidentiality Impact High
Integrity Impact High Availability Impact High
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:L/AC:M/Au:N/C:P/I:P/A:P)
Cvss Base Score 4.4 Attack Range Local
Cvss Impact Score 6.4 Attack Complexity Medium
Cvss Expoit Score 3.4 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

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.

Original Source

Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15706

CWE : Common Weakness Enumeration

% Id Name
50 % CWE-416 Use After Free
50 % CWE-362 Race Condition

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 7
Application 1
Application 1
Os 4
Os 1
Os 8
Os 1
Os 1
Os 2
Os 4
Os 1
Os 2
Os 3

Sources (Detail)

Source Url
CONFIRM https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011
https://security.netapp.com/advisory/ntap-20200731-0008/
https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/
https://www.openwall.com/lists/oss-security/2020/07/29/3
DEBIAN https://www.debian.org/security/2020-GRUB-UEFI-SecureBoot
https://www.debian.org/security/2020/dsa-4735
MLIST http://www.openwall.com/lists/oss-security/2020/07/29/3
REDHAT https://access.redhat.com/security/vulnerabilities/grub2bootloader
SUSE http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.html
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.html
https://www.suse.com/c/suse-addresses-grub2-secure-boot-issue/
https://www.suse.com/support/kb/doc/?id=000019673
UBUNTU http://ubuntu.com/security/notices/USN-4432-1
https://usn.ubuntu.com/4432-1/
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass

Alert History

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Date Informations
2020-09-03 01:29:45
  • Multiple Updates
2020-08-09 00:22:58
  • Multiple Updates
2020-08-05 05:22:54
  • Multiple Updates
2020-08-03 21:23:21
  • Multiple Updates
2020-07-31 21:23:10
  • Multiple Updates
2020-07-30 05:22:50
  • Multiple Updates
2020-07-30 00:22:55
  • First insertion