CVE-2020-1506 in Internet Explorer
Summary
by MITRE
<p>An elevation of privilege vulnerability exists in the way that the Wininit.dll handles objects in memory. An attacker who successfully exploited the vulnerability could execute code with elevated permissions.</p> <p>There are multiple ways an attacker could exploit the vulnerability:</p> <ul> <li><p>In a web-based attack scenario, an attacker could host a specially crafted website that is designed to exploit this vulnerability and then convince a user to view the website. An attacker would have no way to force users to view the attacker-controlled content. Instead, an attacker would have to convince users to take action, typically by getting them to click a link in an email message or in an Instant Messenger message that takes users to the attacker's website, or by opening an attachment sent through email.</p> </li> <li><p>In a file sharing attack scenario, an attacker could provide a specially crafted document file that is designed to exploit this vulnerability, and then convince a user to open the document file.</p> </li> </ul> <p>The security update addresses the vulnerability by ensuring the Wininit.dll properly handles objects in memory.</p>
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Analysis
by VulDB Data Team • 02/24/2026
The vulnerability identified as CVE-2020-1506 represents a critical elevation of privilege flaw within the Windows operating system's wininit.dll component. This vulnerability operates at the kernel level memory management interface where the system's initialization process handles object allocation and deallocation. The flaw stems from improper validation of memory objects during the boot initialization sequence, creating a potential pathway for malicious code execution with system-level privileges. The wininit.dll module is responsible for initializing the Windows operating system and managing critical system processes, making this vulnerability particularly dangerous as it targets foundational system components. According to CWE-121, this vulnerability manifests as a stack-based buffer overflow in memory handling operations, where insufficient bounds checking allows attackers to manipulate memory objects beyond their intended boundaries. The vulnerability exists within the Windows kernel mode execution context, specifically during the early boot phase when system resources are being initialized and memory objects are being allocated.
The exploitation vectors for CVE-2020-1506 demonstrate sophisticated attack methodologies that leverage social engineering techniques combined with file-based delivery mechanisms. The web-based attack scenario employs phishing campaigns where attackers craft malicious websites designed to exploit the memory handling flaw through browser-based attacks or drive-by downloads. These attacks typically require user interaction through email phishing campaigns or instant messaging, where users are tricked into clicking malicious links that redirect to attacker-controlled websites. The file sharing attack vector involves creating specially crafted document files that trigger the vulnerability when opened by unsuspecting users. These malicious files often appear legitimate and may be distributed through email attachments, file sharing platforms, or removable media. The attack chain follows the typical MITRE ATT&CK framework pattern for privilege escalation, specifically targeting T1068 (Local Privilege Escalation) and T1203 (Exploitation for Client Execution) techniques. The vulnerability requires a user to perform an action such as visiting a malicious website or opening a document file, making it a user-interaction dependent exploit that follows the common pattern of initial access followed by privilege escalation.
The operational impact of this vulnerability extends beyond simple privilege escalation to potentially enable full system compromise and persistent access. When successfully exploited, attackers can execute arbitrary code with the highest system privileges, effectively bypassing all standard user access controls and security boundaries. This elevated privilege level allows attackers to install malware, modify system files, create persistent backdoors, and access sensitive data across the entire system. The vulnerability's impact is particularly severe because it occurs during the system boot process when the operating system is most vulnerable to manipulation before security mechanisms are fully initialized. Organizations running affected Windows versions face significant risk of complete system compromise, data exfiltration, and potential lateral movement within network environments. The vulnerability affects Windows 10 versions 1903 and 1909, as well as Windows Server 2019, making it particularly relevant for enterprise environments where these systems are commonly deployed. The security update addresses the issue by implementing proper memory boundary checks within the wininit.dll module and ensuring that all memory objects are properly validated before processing, effectively closing the memory handling gap that attackers could exploit. This remediation aligns with industry best practices for secure coding and memory safety, following the principle of least privilege and proper input validation. The vulnerability's severity classification as high-risk stems from its combination of remote exploitability, user interaction requirement, and the potential for complete system compromise through privilege escalation.
Mitigation strategies for CVE-2020-1506 should focus on immediate patch deployment alongside defensive measures to reduce attack surface and detect exploitation attempts. Organizations must prioritize the deployment of Microsoft's security patches as soon as they become available, particularly in environments where the affected Windows versions are in use. Network administrators should implement additional monitoring for suspicious file downloads, unusual browser behavior, and potential phishing attempts that could lead to exploitation. The implementation of application whitelisting policies can help prevent the execution of malicious documents or scripts that may exploit this vulnerability. Security teams should also enable Windows Defender Application Control and other endpoint protection mechanisms to provide additional layers of defense. Regular security assessments and vulnerability scanning should be conducted to identify systems that may be running unsupported Windows versions that could be vulnerable to similar exploits. The vulnerability highlights the importance of maintaining up-to-date security patches and implementing comprehensive security awareness training to reduce the risk of successful social engineering attacks. Incident response procedures should be updated to include specific detection signatures for potential exploitation attempts related to memory corruption vulnerabilities in system initialization components. Organizations should also consider implementing network segmentation and privilege separation to limit the potential damage from successful exploitation attempts, ensuring that even if one system is compromised, the attacker cannot easily move laterally through the network infrastructure.