Windows Common Log File System Driver Elevation of Privilege Vulnerability
CVE-2021-43226

7.8HIGH

Key Information:

Vendor

Microsoft
Status
Windows 10 Version 1809
Windows Server 2019
Windows Server 2019 (server Core Installation)
Windows 10 Version 1909
Vendor
CVE Published:
15 December 2021

Badges

👾 Exploit Exists🟡 Public PoC🟣 EPSS 38%🦅 CISA Reported

What is CVE-2021-43226?

The Windows Common Log File System Driver is susceptible to an elevation of privilege vulnerability that could allow an authenticated attacker to execute arbitrary code with elevated privileges. This flaw arises due to improper handling of objects in memory, and it can be exploited by executing a specially crafted application. Successful exploitation may result in the attacker being able to take control of the affected system, potentially compromising the integrity and security of sensitive information.

CISA has reported CVE-2021-43226

CISA provides regional cyber and physical services to support security and resilience across the United States. CISA monitor the most dangerious vulnerabilities and have identifed CVE-2021-43226 as being exploited but is not known by the CISA to be used in ransomware campaigns. This is subject to change at pace

The CISA's recommendation is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Affected Version(s)

Windows 10 Version 1507 32-bit Systems 10.0.0 < 10.0.10240.19145

Windows 10 Version 1607 32-bit Systems 10.0.0 < 10.0.14393.4825

Windows 10 Version 1809 32-bit Systems 10.0.0 < 10.0.17763.2366

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

cve-2021-43226PoC
Created by Rosayxy

References

https://portal.msrc.microsoft.com/en-US/security-guidance...
x_refsource_MISC

EPSS Score

38% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🦅

    CISA Reported

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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CVE-2021-43226 : Windows Common Log File System Driver Elevation of Privilege Vulnerability