Vulnerability CVE-2020-15706
Published: 2020-07-29

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.

Type:

CWE-362

CVSS2 => (AV:L/AC:M/Au:N/C:P/I:P/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.4/10
6.4/10
3.4/10
Exploit range
Attack complexity
Authentication
Local
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial
Affected software
SUSE -> Suse linux enterprise server 
Redhat -> Enterprise linux atomic host 
Redhat -> Openshift container platform 
Redhat -> Enterprise linux 
Microsoft -> Windows 10 
Microsoft -> Windows 8.1 
Microsoft -> Windows rt 8.1 
Microsoft -> Windows server 2012 
Microsoft -> Windows server 2016 
Microsoft -> Windows server 2019 
GNU -> Grub2 
Debian -> Debian linux 
Canonical -> Ubuntu linux 

 References:
http://ubuntu.com/security/notices/USN-4432-1
http://www.openwall.com/lists/oss-security/2020/07/29/3
https://access.redhat.com/security/vulnerabilities/grub2bootloader
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://usn.ubuntu.com/4432-1/
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass
https://www.debian.org/security/2020/dsa-4735
https://www.debian.org/security/2020-GRUB-UEFI-SecureBoot
https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/
https://www.openwall.com/lists/oss-security/2020/07/29/3
https://www.suse.com/c/suse-addresses-grub2-secure-boot-issue/
https://www.suse.com/support/kb/doc/?id=000019673
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