CVE-2020-0877 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists in Windows when the Win32k component fails to properly handle objects in memory, aka 'Win32k Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2020-0788, CVE-2020-0887.
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Analysis
by VulDB Data Team • 04/11/2024
The vulnerability identified as CVE-2020-0877 represents a critical elevation of privilege flaw within the Windows operating system's Win32k subsystem. This component serves as a crucial interface between user-mode applications and kernel-mode drivers, handling graphics and user interface operations. The vulnerability arises from improper memory object handling within Win32k, creating a pathway for malicious actors to escalate their privileges from standard user level to system level access. This flaw specifically affects Windows 10 versions 1903 and 1909, making it particularly concerning for organizations running these operating system versions. The vulnerability is classified under CWE-121, which deals with Stack-based Buffer Overflow, indicating that the memory handling issue involves improper bounds checking during object manipulation.
The technical exploitation of this vulnerability occurs through a carefully crafted sequence of operations that manipulate Win32k objects in memory, leading to a situation where arbitrary code execution becomes possible at kernel level. Attackers can leverage this flaw by creating malicious applications or exploiting existing software vulnerabilities to trigger the memory handling error. The flaw is particularly dangerous because it allows privilege escalation without requiring user interaction, making it a prime target for automated exploitation campaigns. This vulnerability operates at the kernel level, where the attacker gains the highest possible privileges on the system, enabling complete compromise of the affected machine.
The operational impact of CVE-2020-0877 extends beyond simple privilege escalation, as it provides attackers with complete system control capabilities. Once exploited, adversaries can access all system resources, modify critical files, install persistent backdoors, and exfiltrate sensitive data without detection. The vulnerability's presence in Windows 10 1903 and 1909 makes it particularly dangerous for enterprise environments where these versions are commonly deployed. Organizations running affected systems face significant risk of data breaches, system compromise, and potential lateral movement within their networks. The vulnerability's classification as a remote code execution flaw means that attackers can exploit it without physical access to the target system, making it a high-value target for cybercriminals and nation-state actors alike.
Mitigation strategies for this vulnerability require immediate patch deployment through Microsoft's regular security updates, specifically addressing the Win32k memory handling issues. Organizations should prioritize patch management processes to ensure all Windows 10 systems are updated promptly, particularly those running the affected 1903 and 1909 versions. Additional defensive measures include implementing application whitelisting policies, monitoring for suspicious Win32k activity, and deploying endpoint detection and response solutions that can identify exploitation attempts. The vulnerability's characteristics align with ATT&CK technique T1068, which covers Exploitation for Privilege Escalation, making it important for security teams to monitor for indicators of compromise related to kernel-level exploits and privilege escalation activities. System administrators should also consider implementing network segmentation and privilege separation measures to limit potential damage from successful exploitation attempts.