CVE-2020-1277 in Windows
Summary
by MITRE
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.
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Analysis
by VulDB Data Team • 10/23/2020
The vulnerability described in CVE-2020-1277 represents a critical elevation of privilege flaw within the Windows Installer component that fundamentally undermines system security boundaries. This issue stems from improper handling of filesystem operations during the installation process, creating a pathway for malicious actors to escalate their privileges from standard user level to administrative rights. The vulnerability specifically affects Windows operating systems and manifests when the installer component processes certain file system interactions that should normally be restricted to privileged operations only. The flaw exists in the core Windows Installer service which is responsible for managing application installations and updates across the operating system, making it a prime target for exploitation due to its widespread use and privileged execution context.
The technical implementation of this vulnerability involves the Windows Installer's failure to properly validate and restrict filesystem operations that should be confined to administrator-level privileges. When an attacker executes a malicious installer package or manipulates existing installation processes, the vulnerable component fails to enforce proper access controls on critical system resources. This misconfiguration allows unprivileged users to perform operations that should require elevated permissions, effectively bypassing the standard Windows security model that separates user and administrative contexts. The flaw operates at the kernel level within the Windows Installer service, where file system operations are not properly sandboxed or restricted, creating an attack surface that can be exploited through various malicious payload delivery mechanisms.
From an operational perspective, this vulnerability presents a significant risk to enterprise environments where standard users may have access to systems that could be exploited for privilege escalation. The impact extends beyond individual system compromise to potentially enable broader network infiltration, as attackers can leverage the elevated privileges to install persistent backdoors, modify system configurations, or access sensitive data repositories. The vulnerability's exploitation requires only basic user-level execution capabilities, making it particularly dangerous as it can be triggered through social engineering attacks, malicious email attachments, or compromised software distribution channels. Organizations running affected Windows versions face potential compromise of their entire security infrastructure when this vulnerability is successfully exploited, as the elevated privileges gained can be used to bypass traditional security controls and access system resources that should remain protected.
Mitigation strategies for CVE-2020-1277 should focus on immediate patch deployment through Microsoft's security updates, which address the core filesystem validation issues within the Windows Installer component. Organizations should also implement additional security controls including application whitelisting to restrict installation packages, enhanced monitoring of installer processes, and regular security assessments of system configurations. The vulnerability aligns with CWE-276 which describes improper privilege management in software systems, and relates to ATT&CK technique T1068 which covers privilege escalation through local exploits. Network administrators should consider implementing strict access controls and privilege separation measures to limit the potential impact of successful exploitation, while security teams should monitor for unusual installer activity and maintain updated threat intelligence on related attack patterns that leverage similar privilege escalation vectors.