CVE-2020-0729 in Windows
Summary
by MITRE
A remote code execution vulnerability exists in Microsoft Windows that could allow remote code execution if a .LNK file is processed.An attacker who successfully exploited this vulnerability could gain the same user rights as the local user, aka 'LNK Remote Code Execution Vulnerability'.
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Analysis
by VulDB Data Team • 05/12/2025
The vulnerability identified as CVE-2020-0729 represents a critical remote code execution flaw within Microsoft Windows operating systems that specifically affects the processing of .LNK files. This vulnerability operates at the core of Windows file handling mechanisms, where .LNK files serve as shortcuts that store references to executable programs or other file system objects. The flaw manifests when Windows processes these shortcut files, particularly when they contain maliciously crafted content that triggers unintended code execution paths within the operating system's file handling subsystem.
This vulnerability stems from insufficient validation of .LNK file attributes during processing, allowing attackers to manipulate the file structure in ways that bypass normal security checks. The technical implementation involves the Windows Shell handling component that interprets .LNK file metadata, particularly the target path and additional attributes stored within the file's structure. When a user or system processes a malicious .LNK file, the vulnerability allows an attacker to inject and execute arbitrary code with the privileges of the currently logged-in user. The flaw does not require elevated privileges for exploitation, making it particularly dangerous as it can be triggered by simple user interaction with a malicious shortcut file.
The operational impact of CVE-2020-0729 extends beyond simple remote code execution to encompass complete system compromise when combined with other attack vectors. An attacker exploiting this vulnerability can establish persistent access through the execution of malicious payloads, potentially leading to data exfiltration, system reconnaissance, or deployment of additional malware. The vulnerability affects multiple Windows versions including Windows 10, Windows Server 2016, and Windows Server 2019, creating widespread exposure across enterprise environments. The attack surface is particularly broad as .LNK files can be delivered through various vectors including email attachments, web downloads, removable media, and network shares, making the exploitation potential extremely high.
Security professionals should note that this vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and maps to ATT&CK technique T1059.001 for command and scripting interpreter, as well as T1068 for exploit for privilege escalation. The vulnerability demonstrates characteristics of a privilege escalation flaw where a user-level process can execute code with elevated privileges. Mitigation strategies should include immediate deployment of Microsoft security patches, implementation of strict file execution policies, and user education to avoid opening suspicious .LNK files. Network-based protections such as firewall rules that block file sharing protocols and email filtering systems should also be enhanced to prevent delivery of malicious .LNK files. Organizations should implement application whitelisting policies to restrict execution of .LNK files from untrusted sources and monitor for unusual file processing activities that might indicate exploitation attempts. The vulnerability also highlights the importance of secure coding practices in file handling components and the need for comprehensive input validation in system-level applications.