Attacker Value
Unknown
(0 users assessed)
Exploitability
Unknown
(0 users assessed)
User Interaction
None
Privileges Required
High
Attack Vector
Local
0

CVE-2020-15706

Disclosure Date: July 29, 2020 •
CVE-2020-15706 CVSS v3 Base Score: 6.4
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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.

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CVSS V3 Severity and Metrics
Base Score:
6.4 Medium
Impact Score:
5.9
Exploitability Score:
0.5
Vector:
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Attack Vector (AV):
Local
Attack Complexity (AC):
High
Privileges Required (PR):
High
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
High
Integrity (I):
High
Availability (A):
High

General Information

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
grub2 in Ubuntu 2.04-1ubuntu26.1
grub2 in Ubuntu 2.02-2ubuntu8.16
grub2 in Ubuntu 2.02~beta2-36ubuntu3.26
grub2 in Ubuntu 2.02~beta2-9ubuntu1.20
Prerequisites
Unknown
Discovered By
Unknown
PoC Author
Unknown
Metasploit Module
Unknown
Reporter
Unknown

Vendors

  • canonical,
  • debian,
  • gnu,
  • microsoft,
  • opensuse,
  • redhat,
  • suse

Products

  • debian linux 10.0,
  • enterprise linux 7.0,
  • enterprise linux 8.0,
  • enterprise linux atomic host -,
  • grub2,
  • leap 15.1,
  • leap 15.2,
  • openshift container platform 4.0,
  • suse linux enterprise server 11,
  • suse linux enterprise server 12,
  • suse linux enterprise server 15,
  • ubuntu linux 14.04,
  • ubuntu linux 16.04,
  • ubuntu linux 18.04,
  • ubuntu linux 20.04,
  • windows 10 -,
  • windows 10 1607,
  • windows 10 1709,
  • windows 10 1803,
  • windows 10 1809,
  • windows 10 1903,
  • windows 10 1909,
  • windows 10 2004,
  • windows 8.1 -,
  • windows rt 8.1 -,
  • windows server 2012 -,
  • windows server 2012 r2,
  • windows server 2016 -,
  • windows server 2016 1903,
  • windows server 2016 1909,
  • windows server 2016 2004,
  • windows server 2019 -

Additional Info

Authenticated
Unknown
Exploitable
Unknown
Reliability
Unknown
Stability
Unknown
Available Mitigations
Unknown
Shelf Life
Unknown
Userbase/Installbase
Unknown
Patch Effectiveness
Unknown
Technical Analysis