CVE-2020-0870 in Windows
Summary
by MITRE
<p>An elevation of privilege vulnerability exists when the Shell infrastructure component improperly handles objects in memory. An attacker who successfully exploited this vulnerability could run processes in an elevated context.</p> <p>To exploit this vulnerability, an attacker would first have to log on to the system. An attacker could then run a specially crafted application that could exploit the vulnerability and take control of an affected system.</p> <p>The update addresses the vulnerability by correcting the way in which the Shell infrastructure component handles objects in memory and preventing unintended elevation from lower integrity application.</p>
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Analysis
by VulDB Data Team • 02/24/2026
The vulnerability identified as CVE-2020-0870 represents a critical elevation of privilege flaw within the Windows Shell infrastructure component, specifically manifesting in improper memory object handling practices. This vulnerability falls under the CWE-264 weakness category, which encompasses permissions, privileges, and access control issues, and aligns with ATT&CK technique T1068 which covers local privilege escalation through system binary manipulation. The flaw exists within the core Windows shell functionality that manages user interface elements, file operations, and system interactions, making it a prime target for attackers seeking to escalate their system privileges.
The technical exploitation of this vulnerability requires an attacker to first establish a valid user session on the target system, which significantly reduces the attack surface but does not eliminate the threat. Once authenticated, the attacker can execute a specially crafted application designed to trigger the memory handling flaw within the shell infrastructure. This process involves manipulating objects in memory in a way that bypasses the normal integrity checks and privilege boundaries that should prevent unauthorized elevation of privileges. The vulnerability specifically targets the shell's ability to properly validate and handle memory objects, allowing malicious code to execute with elevated privileges that should normally be restricted to administrators or system processes.
The operational impact of this vulnerability extends beyond simple privilege escalation as it provides attackers with the ability to execute arbitrary code with system-level privileges, potentially leading to complete system compromise. An attacker with elevated privileges could install malware, modify system files, create new user accounts, access sensitive data, or establish persistent backdoors within the compromised system. The vulnerability's design flaw in memory object handling creates a pathway for attackers to circumvent Windows' integrity level protections, which are fundamental to the operating system's security model. This type of vulnerability is particularly dangerous because it operates within the core system infrastructure rather than requiring exploitation of third-party applications, making detection and remediation more challenging.
Microsoft addressed this vulnerability through a comprehensive update that corrects the memory handling procedures within the Shell infrastructure component. The fix specifically targets the improper object handling that enabled privilege escalation while maintaining the legitimate functionality of the shell. The mitigation approach focuses on strengthening the validation mechanisms that control how memory objects are processed and ensuring that applications cannot inadvertently elevate their privileges through memory manipulation techniques. Organizations should implement this security update immediately as part of their vulnerability management processes, as the vulnerability's exploitation requires only a standard user login and can result in complete system compromise. The fix represents a defensive programming approach that aligns with security best practices outlined in the CWE guidelines for preventing privilege escalation vulnerabilities and addresses the specific ATT&CK tactics that leverage shell manipulation for privilege elevation.