6.4

CVE-2020-15706

GRUB2 contains a race condition leading to a use-after-free vulnerability which can be triggered by redefining a function whilst the same function is already executing.

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Gnu ≫ Grub2 Version <= 2.04
Canonical ≫ Ubuntu Linux Version 14.04 SwEdition esm
Canonical ≫ Ubuntu Linux Version 16.04 SwEdition lts
Canonical ≫ Ubuntu Linux Version 18.04 SwEdition lts
Canonical ≫ Ubuntu Linux Version 20.04 SwEdition lts
Debian ≫ Debian Linux Version 10.0
Redhat ≫ Enterprise Linux Version 7.0
Redhat ≫ Enterprise Linux Version 8.0
Microsoft ≫ Windows 10 Version -
Microsoft ≫ Windows 10 Version 1607
Microsoft ≫ Windows 10 Version 1709
Microsoft ≫ Windows 10 Version 1803
Microsoft ≫ Windows 10 Version 1809
Microsoft ≫ Windows 10 Version 1903
Microsoft ≫ Windows 10 Version 1909
Microsoft ≫ Windows 10 Version 2004
Microsoft ≫ Windows 8.1 Version -
Microsoft ≫ Windows Rt 8.1 Version -
Microsoft ≫ Windows Server 2016 Version 1903
Microsoft ≫ Windows Server 2016 Version 1909
Microsoft ≫ Windows Server 2016 Version 2004
Opensuse ≫ Leap Version 15.1
Opensuse ≫ Leap Version 15.2
Canonical ≫ Ubuntu Linux Version 14.04 SwEdition esm
Canonical ≫ Ubuntu Linux Version 16.04 SwEdition esm
Canonical ≫ Ubuntu Linux Version 18.04 SwEdition lts
Canonical ≫ Ubuntu Linux Version 20.04 SwEdition lts
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.98% 0.575
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
NIST 6.4 0.5 5.9
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
NIST 4.4 3.4 6.4
AV:L/AC:M/Au:N/C:P/I:P/A:P
Canonical 6.4 0.5 5.9
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

http://www.openwall.com/lists/oss-security/2020/07/29/3
Third Party Advisory
Mailing List
http://ubuntu.com/security/notices/USN-4432-1
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
Vendor Advisory
Issue Tracking
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011
Patch
Third Party Advisory
Vendor Advisory
https://security.gentoo.org/glsa/202104-05
Third Party Advisory
https://security.netapp.com/advisory/ntap-20200731-0008/
Third Party Advisory
https://usn.ubuntu.com/4432-1/
Third Party Advisory
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass
Third Party Advisory
https://www.debian.org/security/2020-GRUB-UEFI-SecureBoot
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
Third Party Advisory
Mailing List
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
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.html
Third Party Advisory
Broken Link
Mailing List
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.html
Third Party Advisory
Broken Link
Mailing List
https://www.debian.org/security/2020/dsa-4735
Third Party Advisory