What’s Vulnerable › Vulnerabilities

CVE-2019-1170: Windows NTFS Elevation of Privilege Vulnerability

• Severity: high (CVSS 7.2 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-08-14 · updated 2026-06-17
• Weakness: CWE-862

Description

An elevation of privilege vulnerability exists when reparse points are created by sandboxed processes allowing sandbox escape. An attacker who successfully exploited the vulnerability could use the sandbox escape to elevate privileges on an affected system. To exploit the vulnerability, an attacker would first have to log on to the system, and then run a specially crafted application to take control over the affected system. The security update addresses the vulnerability by preventing sandboxed processes from creating reparse points targeting inaccessible files.

Affected products

• Microsoft Windows 10 Version 1607: 1809, 1903
• Microsoft Windows Server 2016: 1903
• Microsoft Windows Server 2019: all versions
• Microsoft Windows 10: from 10.0.0 before publication — fixed in publication
• Microsoft Windows 10 Version 1903 for 32-bit Systems: from 10.0.0 before publication — fixed in publication
• Microsoft Windows 10 Version 1903 for ARM64-based Systems: from 10.0.0 before publication — fixed in publication
• Microsoft Windows 10 Version 1903 for x64-based Systems: from 10.0.0 before publication — fixed in publication
• Microsoft Windows Server 2019: from 10.0.0 before publication — fixed in publication
• Microsoft Windows Server, version 1903 (Server Core installation): from 10.0.0 before publication — fixed in publication

How to fix

Upgrade to a fixed version: Microsoft Windows 10 publication; Microsoft Windows 10 Version 1903 for 32-bit Systems publication; Microsoft Windows 10 Version 1903 for ARM64-based Systems publication; Microsoft Windows 10 Version 1903 for x64-based Systems publication; Microsoft Windows Server 2019 publication; Microsoft Windows Server, version 1903 (Server Core installation) publication. Check the vendor advisory for mitigations.

References

• http://packetstormsecurity.com/files/154192/Microsoft-Windows-SET_REPARSE_POINT_EX-Mount-Point-Security-Feature-Bypass.html
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1170
• http://packetstormsecurity.com/files/154192/Microsoft-Windows-SET_REPARSE_POINT_EX-Mount-Point-Security-Feature-Bypass.html
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1170

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