Attacker Value
Unknown
(2 users assessed)
Exploitability
Unknown
(2 users assessed)
User Interaction
None
Privileges Required
Low
Attack Vector
Local
9

CVE-2021-41379

Disclosure Date: November 10, 2021
Add MITRE ATT&CK tactics and techniques that apply to this CVE.
Credential Access
Techniques
Validation
Validated
Validated
Validated
Validated
Defense Evasion
Techniques
Validation
Validated
Validated
Validated
Validated
Validated
Lateral Movement
Techniques
Validation
Validated

Description

Windows Installer Elevation of Privilege Vulnerability

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0
Technical Analysis

The patch bypass for this vulnerability is now being exploited in the wild as noted at https://blog.talosintelligence.com/2021/11/attackers-exploiting-zero-day.html. I have not labeled this bug as exploited in the wild though as the code noted below by @kevthehermit is an exploit for a variant of this bug, not this bug itself, however it is important to note that the bugs are related and no patch exists yet for the variant at the time of writing (November 24th 2021).

CVSS V3 Severity and Metrics
Base Score:
7.8 High
Impact Score:
5.9
Exploitability Score:
1.8
Vector:
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector (AV):
Local
Attack Complexity (AC):
Low
Privileges Required (PR):
Low
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
High
Integrity (I):
High
Availability (A):
High

General Information

Vendors

  • Microsoft

Products

  • Windows,
  • Windows Server,
  • Windows 10 Version 1909 for 32-bit Systems,
  • Windows 10 Version 1909 for x64-based Systems,
  • Windows 10 Version 1909 for ARM64-based Systems,
  • Windows 10 Version 21H1 for x64-based Systems,
  • Windows 10 Version 21H1 for ARM64-based Systems,
  • Windows 10 Version 21H1 for 32-bit Systems,
  • Windows Server 2022,
  • Windows Server 2022 (Server Core installation),
  • Windows 10 Version 2004 for 32-bit Systems,
  • Windows 10 Version 2004 for ARM64-based Systems,
  • Windows 10 Version 2004 for x64-based Systems,
  • Windows Server, version 2004 (Server Core installation),
  • Windows 10 Version 20H2 for x64-based Systems,
  • Windows 10 Version 20H2 for 32-bit Systems,
  • Windows 10 Version 20H2 for ARM64-based Systems,
  • Windows Server, version 20H2 (Server Core Installation),
  • Windows 11 for x64-based Systems,
  • Windows 11 for ARM64-based Systems

Additional Info

Technical Analysis