CVE-2020-1507 in Windows
Summary
by MITRE
<p>An elevation of privilege vulnerability exists in the way that Microsoft COM for Windows handles objects in memory. An attacker who successfully exploited the vulnerability could gain elevated privileges on a targeted system.</p> <p>To exploit the vulnerability, a user would have to open a specially crafted file.</p> <p>The security update addresses the vulnerability by correcting how Microsoft COM for Windows handles objects in memory.</p>
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Analysis
by VulDB Data Team • 02/24/2026
The vulnerability identified as CVE-2020-1507 represents a critical elevation of privilege flaw within Microsoft's Component Object Model (COM) implementation for Windows operating systems. This weakness resides in how the COM framework manages object references and memory allocation during runtime operations, creating an exploitable condition that allows malicious actors to escalate their privileges from standard user level to administrative rights. The vulnerability specifically affects the memory handling mechanisms within COM objects, which are fundamental components that enable software interoperability and component-based development across the Windows ecosystem. Attackers can leverage this flaw by crafting malicious files that, when opened by unsuspecting users, trigger the vulnerable COM object processing path.
The exploitation mechanism relies on a user interaction model where the target must open a specially crafted file that contains malicious COM object references or memory corruption payloads. This file-based attack vector aligns with common social engineering techniques and represents a significant concern for enterprise security environments where users may inadvertently encounter compromised content through email attachments, web downloads, or removable media. The vulnerability's impact extends beyond simple privilege escalation as it provides attackers with elevated system access that can be used for persistent access, data exfiltration, or further exploitation of other system components. The attack surface is particularly concerning given that COM objects are extensively used throughout Windows applications and system services, making the exploitation potential widespread across various attack scenarios.
From a technical perspective, the flaw manifests in improper memory management within the COM subsystem, where objects may not be properly validated or sanitized before processing. This memory handling issue creates opportunities for memory corruption attacks that can be leveraged to execute arbitrary code with elevated privileges. The vulnerability's classification aligns with CWE-121, which describes heap-based buffer overflow conditions, and potentially CWE-122, which covers buffer overflow vulnerabilities in heap data structures. The memory corruption aspects of this vulnerability make it particularly dangerous as they can be used to bypass modern exploit mitigations such as address space layout randomization and data execution prevention mechanisms. The COM framework's role in system-level operations means that exploitation can result in complete system compromise rather than just application-level privilege escalation.
Microsoft's security update for CVE-2020-1507 addresses the root cause by implementing proper memory validation and object handling procedures within the COM subsystem. The fix ensures that COM objects are properly validated before memory operations occur, preventing the corruption conditions that enable privilege escalation. This remediation approach follows established security best practices for memory safety and aligns with the ATT&CK framework's mitigation strategies for privilege escalation techniques. Organizations should prioritize deployment of this update as it directly addresses a critical vulnerability that could be exploited in the wild, particularly in targeted attacks against high-value systems. The update also includes additional safeguards within the COM object lifecycle management that help prevent similar memory handling issues from occurring in future implementations. Security teams should monitor for exploitation attempts and ensure comprehensive patch deployment across all affected Windows systems to maintain organizational security posture against this and related vulnerabilities.