CVE-2020-0791 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists when the Windows Graphics Component improperly handles objects in memory, aka 'Windows Graphics Component Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2020-0898.
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Analysis
by VulDB Data Team • 04/10/2024
The vulnerability identified as CVE-2020-0791 represents a critical elevation of privilege flaw within the Windows Graphics Component that stems from improper handling of memory objects. This issue affects multiple Windows operating systems including Windows 10 versions 1903 and 1909, Windows Server 2019, and Windows Server 2016. The vulnerability resides in the graphics subsystem's memory management mechanisms, specifically in how the system processes and manages graphics objects during rendering operations. Attackers can exploit this weakness to escalate their privileges from standard user level to system level access, bypassing normal security controls and potentially gaining complete control over affected systems.
The technical root cause of this vulnerability lies in inadequate input validation and memory management within the Windows Graphics Component. When processing certain graphics objects, the system fails to properly validate memory boundaries and object references, creating opportunities for memory corruption that can be leveraged by malicious actors. This flaw aligns with CWE-121, which describes heap-based buffer overflow conditions, and CWE-125, which addresses out-of-bounds read errors. The vulnerability manifests when legitimate user applications interact with graphics rendering functions, particularly those involving complex graphical operations or graphics object manipulation. The improper handling of memory objects allows attackers to craft malicious graphics content that triggers the memory corruption, potentially leading to arbitrary code execution with elevated privileges.
From an operational perspective, this vulnerability poses significant risks to enterprise environments where users may inadvertently encounter malicious graphics content through various attack vectors including email attachments, web downloads, or compromised websites. The attack requires local user access to the system, making it less likely to be exploited remotely but still dangerous in scenarios where attackers have already gained initial access through other means. Once exploited, the vulnerability enables attackers to execute code with SYSTEM privileges, potentially allowing them to install malware, modify system files, establish persistence mechanisms, or exfiltrate sensitive data. The impact extends beyond individual system compromise to potentially affect entire network infrastructures, especially in environments where privileged accounts are frequently used. According to ATT&CK framework, this vulnerability maps to T1068, which covers 'Exploitation for Privilege Escalation', and T1059, which addresses 'Command and Scripting Interpreter' as attackers may use the elevated privileges to execute additional malicious commands.
Mitigation strategies for CVE-2020-0791 primarily involve applying the official Microsoft security patches released as part of the April 2020 security updates. Organizations should prioritize patch deployment across all affected Windows systems, particularly those running the vulnerable versions mentioned in the advisory. System administrators should implement additional security measures such as enabling Windows Defender Application Control, restricting user privileges, and monitoring for unusual graphics-related process activity. Network segmentation and firewall rules can help limit lateral movement if the vulnerability is exploited, while endpoint detection and response solutions can provide visibility into potential exploitation attempts. Regular security assessments and vulnerability scanning should be conducted to identify systems that may not have received the necessary updates, and organizations should maintain robust backup and recovery procedures to address potential compromise scenarios. The vulnerability underscores the importance of maintaining current security patches and implementing defense-in-depth strategies to protect against sophisticated exploitation attempts targeting graphics subsystems.