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CVE-2024-38202

Aug. 8, 2024, 1:04 p.m.

CVSS Score

7.3 / 10

Product(s) Impacted

Windows Backup

Description

Summary Microsoft was notified that an elevation of privilege vulnerability exists in Windows Backup, potentially enabling an attacker with basic user privileges to reintroduce previously mitigated vulnerabilities or circumvent some features of Virtualization Based Security (VBS). However, an attacker attempting to exploit this vulnerability requires additional interaction by a privileged user to be successful. 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, and customers will be notified when the official 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. Details A security researcher informed Microsoft of an elevation of privilege vulnerability in Windows Backup potentially enabling an attacker with basic user privileges to reintroduce previously mitigated vulnerabilities or circumvent some features of VBS. For exploitation to succeed, an attacker must trick or convince an Administrator or a user with delegated permissions into performing a system restore which inadvertently triggers the vulnerability. Microsoft is developing a security update that will mitigate this vulnerability, but it is not yet available. This CVE will be updated with new information and links to the security updates once available. We highly encourage customers subscribe to Security Update Guide notifications to be alerted of updates. See Microsoft Technical Security Notifications and Security Update Guide Notification System News: Create your profile now – Microsoft Security Response Center. Microsoft is not aware of any attempts to exploit this vulnerability. However, a public presentation regarding this vulnerability was hosted at BlackHat on August 7, 2024. The presentation was appropriately coordinated with Microsoft but may change the threat landscape. Customers concerned with these risks should reference the guidance provided in the Recommended Actions section to protect their systems. Recommended Actions The following recommendations do not mitigate the vulnerability but can be used to reduce the risk of exploitation until the security update is available. Configure “Audit Object Access” settings to monitor attempts to access files, such as handle creation, read / write operations, or modifications to security descriptors. Audit File System - Windows 10 | Microsoft Learn Apply a basic audit policy on a file or folder - Windows 10 | Microsoft Learn Audit users with permission to perform Backup and Restore operations to ensure only the appropriate users can perform these operations. Audit: Audit the use of Backup and Restore privilege (Windows 10) - Windows 10 | Microsoft Learn Implement an Access Control List or Discretionary Access Control Lists to restrict the access or modification of Backup files and perform Restore operations to appropriate users, for example administrators only. Access Control overview | Microsoft Learn Discretionary Access Control Lists (DACL) Auditing sensitive privileges used to identify access, modification, or replacement of Backup related files could help indicate attempts to exploit this vulnerability. Audit Sensitive Privilege Use - Windows 10 | Microsoft Learn

Weaknesses

CWE-284
Improper Access Control

The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

CWE ID: 284

Date

Published: Aug. 8, 2024, 2:15 a.m.

Last Modified: Aug. 8, 2024, 1:04 p.m.

Status : Awaiting Analysis

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

secure@microsoft.com

CVSS Data

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score
7.3
Exploitability Score
1.3
Impact Score
5.9
Base Severity
HIGH
CVSS Vector String

The CVSS vector string provides an in-depth view of the vulnerability metrics.

View Vector String

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

References

https://msrc.microsoft.com/ secure@microsoft.com