Elevation of Privilege Vulnerability in Windows Virtualization Based Security
Key Information
- Vendor
- Microsoft
- Status
- Windows 10 Version 1809
- Windows Server 2019
- Windows Server 2019 (server Core Installation)
- Windows Server 2022
- Vendor
- CVE Published:
- 8 August 2024
Badges
Summary
Summary: Microsoft was notified that an elevation of privilege vulnerability exists in Windows based systems supporting Virtualization Based Security (VBS), including a subset of Azure Virtual Machine SKUS. This vulnerability enables an attacker with administrator privileges to replace current versions of Windows system files with outdated versions. By exploiting this vulnerability, an attacker could reintroduce previously mitigated vulnerabilities, circumvent some features of VBS, and exfiltrate data protected by VBS. Microsoft is developing a security update to mitigate this threat, but it is not yet available. Guidance to help customers reduce the risks associated with this vulnerability and to protect their systems until the mitigation is available in a Windows security update is provided in the Recommended Actions section of this CVE. This CVE will be updated when the mitigation is available in a Windows security update. We highly encourage customers to subscribe to Security Update Guide notifications to receive an alert when this update occurs. Update: August 13, 2024 Microsoft has released the August 2024 security updates that include an opt-in revocation policy mitigation to address this vulnerability. Customers running affected versions of Windows are encouraged to review KB5042562: Guidance for blocking rollback of virtualization-based security related updates to assess if this opt-in policy meets the needs of their environment before implementing this mitigation. There are risks associated with this mitigation that should be understood prior to applying it to your systems. Detailed information about these risks is also available in KB5042562. Details: A security researcher informed Microsoft of an elevation of privilege vulnerability in Windows 10, Windows 11, Windows Server 2016, and higher based systems including Azure Virtual Machines (VM) that support VBS. For more information on Windows versions and VM SKUs supporting VBS, reference: Virtualization-based Security (VBS) | Microsoft Learn. The vulnerability enables an attacker with administrator privileges on the target system to replace current Windows system files with outdated versions. Successful exploitation provides an attacker with the ability to reintroduce previously mitigated vulnerabilities, circumvent VBS security features, and exfiltrate data protected by VBS. Microsoft is developing a security... See more at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21302
Affected Version(s)
Windows 10 Version 1809 < 10.0.17763.6189
Windows Server 2019 < 10.0.17763.6189
Windows Server 2019 (Server Core installation) < 10.0.17763.6189
News Articles
September 2024 Patch Tuesday forecast: Downgrade is the new exploit - Help Net Security
Todd Schell from Ivanti gives his overview of August and forecast for September 2024 Patch Tuesday. Are you ready to get patching?
2 weeks ago
Windows Downdate tool lets you 'unpatch' Windows systems
SafeBreach security researcher Alon Leviev has released his Windows Downdate tool, which can be used for downgrade attacks that reintroduce old vulnerabilities in up-to-date Windows 10, Windows 11, and Windows Server systems.
3 weeks ago
Windows Downgrade Attack Risks Exposing Patched Systems to Old Vulnerabilities
Microsoft addresses critical Windows update vulnerabilities that could expose patched systems to old security flaws and bypass virtualization-based se
1 month ago
CVSS V3.1
Timeline
- 👾
Exploit exists.
Vulnerability published.
First article discovered by BleepingComputer
Vulnerability Reserved.