CVE-2020-1277 — An elevation of privilege vulnerability exists in Windows Installer because of t

An elevation of privilege vulnerability exists in Windows Installer because of the way Windows Installer handles certain filesystem operations.To exploit the vulnerability, an attacker would require unprivileged execution on the victim system, aka 'Windows Installer Elevatio

01What is this vulnerability?

An elevation of privilege vulnerability exists in Windows Installer because of the way Windows Installer handles certain filesystem operations.To exploit the vulnerability, an attacker would require unprivileged execution on the victim system, aka 'Windows Installer Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2020-1272, CVE-2020-1302, CVE-2020-1312.

02Affected products

Vendor	Product	Versions
Microsoft	Windows	10 Version 1809 for 32-bit Systems, 10 Version 1809 for x64-based Systems, 10 Version 1809 for ARM64-based Systems
Microsoft	Windows Server	2019, 2019 (Core installation)
Microsoft	Windows 10 Version 1909 for 32	bit Systems — unspecified
Microsoft	Windows 10 Version 1909 for x64	based Systems — unspecified
Microsoft	Windows 10 Version 1909 for ARM64	based Systems — unspecified
Microsoft	Windows Server, version 1909 (Server Core installation)	unspecified
Microsoft	Windows 10 Version 1903 for 32	bit Systems — unspecified
Microsoft	Windows 10 Version 1903 for x64	based Systems — unspecified
Microsoft	Windows 10 Version 1903 for ARM64	based Systems — unspecified
Microsoft	Windows Server, version 1903 (Server Core installation)	unspecified
Microsoft	Windows 10 Version 2004 for 32	bit Systems — unspecified
Microsoft	Windows 10 Version 2004 for ARM64	based Systems — unspecified
Microsoft	Windows 10 Version 2004 for x64	based Systems — unspecified
Microsoft	Windows Server, version 2004 (Server Core installation)	unspecified

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

08Timeline

• Published: 2020-06-09T19:43:50.000Z
• Last modified: 2024-08-04T06:32:00.000Z

09References

• portal.msrc.microsoft.com — https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1277