6.4

CVE-2020-15706

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.

Data is provided by the National Vulnerability Database (NVD)
Gnu ≫ Grub2 Version <= 2.04
Canonical ≫ Ubuntu Linux Version14.04 SwEditionesm
Canonical ≫ Ubuntu Linux Version16.04 SwEditionlts
Canonical ≫ Ubuntu Linux Version18.04 SwEditionlts
Canonical ≫ Ubuntu Linux Version20.04 SwEditionlts
Debian ≫ Debian Linux Version10.0
Redhat ≫ Enterprise Linux Version7.0
Redhat ≫ Enterprise Linux Version8.0
Microsoft ≫ Windows 10 Version-
Microsoft ≫ Windows 10 Version1607
Microsoft ≫ Windows 10 Version1709
Microsoft ≫ Windows 10 Version1803
Microsoft ≫ Windows 10 Version1809
Microsoft ≫ Windows 10 Version1903
Microsoft ≫ Windows 10 Version1909
Microsoft ≫ Windows 10 Version2004
Microsoft ≫ Windows 8.1 Version-
Microsoft ≫ Windows Rt 8.1 Version-
Microsoft ≫ Windows Server 2016 Version1903
Microsoft ≫ Windows Server 2016 Version1909
Microsoft ≫ Windows Server 2016 Version2004
Opensuse ≫ Leap Version15.1
Opensuse ≫ Leap Version15.2
Canonical ≫ Ubuntu Linux Version14.04 SwEditionesm
Canonical ≫ Ubuntu Linux Version16.04 SwEditionesm
Canonical ≫ Ubuntu Linux Version18.04 SwEditionlts
Canonical ≫ Ubuntu Linux Version20.04 SwEditionlts
Zu dieser CVE wurde keine CISA KEV oder CERT.AT-Warnung gefunden.
EPSS Metriken
Type Source Score Percentile
EPSS FIRST.org 0.06% 0.191
CVSS Metriken
Source Base Score Exploit Score Impact Score Vector string
nvd@nist.gov 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
nvd@nist.gov 4.4 3.4 6.4
AV:L/AC:M/Au:N/C:P/I:P/A:P
security@ubuntu.com 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.

https://usn.ubuntu.com/4432-1/
Third Party Advisory