Windows Advanced Local Procedure Call (ALPC) Elevation of Privilege Vulnerability

Source data

Overview

Heap-based buffer overflow in Windows ALPC allows an authorized attacker to elevate privileges locally.

Impact & technical details

Elevation of Privilege

What privileges could be gained by an attacker who successfully exploited this vulnerability? An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.

How could an attacker exploit this vulnerability? An attacker who can execute code in a low-privilege AppContainer could exploit this vulnerability locally to escape the sandbox and elevate privileges on the affected system. No additional user interaction is required.

CVSS base score

7.8 / 10

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C

Highest base score supplied by MSRC for this record; the vector belongs to that score. Ratings can vary by product. Microsoft Important is displayed as High; Moderate is displayed as Medium.

Affected products

• Windows 10 Version 1607 for 32-bit Systems
• Windows 10 Version 1607 for x64-based Systems
• Windows 10 Version 1809 for 32-bit Systems
• Windows 10 Version 1809 for x64-based Systems
• Windows 10 Version 21H2 for 32-bit Systems
• Windows 10 Version 21H2 for ARM64-based Systems
• Windows 10 Version 21H2 for x64-based Systems
• Windows 10 Version 22H2 for 32-bit Systems

Source guidance

Remediation

• Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

At least one Microsoft vendor-fix reference is available. Check each affected product for its applicable update, prerequisites, and supported version.

Authoritative sources & updates

Findings and update information come from the linked publishers. GTP compiles the public record and provides the recommendation above. CVSS ratings shown here come from Microsoft. NVD references provide additional public context.

• Microsoft Security Response Center (opens in a new tab)
• Microsoft security update · 5122876 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5122882 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5122878 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5123099 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5123065 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5123066 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• CISA Known Exploited Vulnerabilities (opens in a new tab)
• Authoritative advisory (opens in a new tab)
• Authoritative advisory (opens in a new tab)
• Authoritative advisory (opens in a new tab)
• NIST National Vulnerability Database (opens in a new tab)