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

CVE-2021-3695

Disclosure Date: July 06, 2022
Add MITRE ATT&CK tactics and techniques that apply to this CVE.

Description

A crafted 16-bit grayscale PNG image may lead to a out-of-bounds write in the heap area. An attacker may take advantage of that to cause heap data corruption or eventually arbitrary code execution and circumvent secure boot protections. This issue has a high complexity to be exploited as an attacker needs to perform some triage over the heap layout to achieve signifcant results, also the values written into the memory are repeated three times in a row making difficult to produce valid payloads. This flaw affects grub2 versions prior grub-2.12.

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CVSS V3 Severity and Metrics
Base Score:
4.5 Medium
Impact Score:
3.4
Exploitability Score:
1
Vector:
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
Attack Vector (AV):
Local
Attack Complexity (AC):
High
Privileges Required (PR):
Low
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
Low
Integrity (I):
Low
Availability (A):
Low

General Information

Vendors

  • fedoraproject,
  • gnu,
  • netapp,
  • redhat

Products

  • codeready linux builder -,
  • developer tools 1.0,
  • enterprise linux 8.0,
  • enterprise linux 8.1,
  • enterprise linux 8.4,
  • enterprise linux 9.0,
  • enterprise linux eus 8.2,
  • enterprise linux eus 8.4,
  • enterprise linux eus 8.6,
  • enterprise linux eus 9.0,
  • enterprise linux for power little endian 8.0,
  • enterprise linux for power little endian 9.0,
  • enterprise linux for power little endian eus 8.2,
  • enterprise linux for power little endian eus 8.4,
  • enterprise linux for power little endian eus 8.6,
  • enterprise linux for power little endian eus 9.0,
  • enterprise linux server aus 8.2,
  • enterprise linux server aus 8.4,
  • enterprise linux server aus 8.6,
  • enterprise linux server for power little endian update services for sap solutions 8.1,
  • enterprise linux server for power little endian update services for sap solutions 8.2,
  • enterprise linux server for power little endian update services for sap solutions 8.4,
  • enterprise linux server for power little endian update services for sap solutions 8.6,
  • enterprise linux server for power little endian update services for sap solutions 9.0,
  • enterprise linux server tus 8.2,
  • enterprise linux server tus 8.4,
  • enterprise linux server tus 8.6,
  • fedora 36,
  • grub,
  • ontap select deploy administration utility -,
  • openshift 3.0,
  • openshift container platform 4.10,
  • openshift container platform 4.6,
  • openshift container platform 4.9

Additional Info

Technical Analysis