CVE-2020-1012 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 described in CVE-2020-1012 represents a critical elevation of privilege flaw within the Windows operating system's Wininit.dll component. This vulnerability falls under the category of memory corruption issues that can be exploited to gain unauthorized administrative access to affected systems. The Wininit.dll module serves as a crucial initialization component in Windows systems, responsible for managing the early boot process and system initialization tasks. When this component fails to properly handle memory objects, it creates an exploitable condition that allows malicious actors to execute arbitrary code with elevated privileges, effectively bypassing standard security boundaries.
The technical exploitation of this vulnerability stems from improper memory handling within the Wininit.dll module, which creates opportunities for attackers to manipulate memory structures and execute malicious code with system-level privileges. This flaw demonstrates characteristics consistent with heap-based buffer overflow conditions or use-after-free vulnerabilities, where attacker-controlled data can be used to corrupt memory and redirect execution flow. The vulnerability's classification aligns with CWE-121, which describes heap-based buffer overflow conditions, and CWE-125, which addresses out-of-bounds read vulnerabilities. Attackers can leverage this weakness through various delivery mechanisms that exploit the memory handling flaw during system initialization phases.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass complete system compromise potential. Attackers who successfully exploit this vulnerability can execute code with the highest available privileges, potentially gaining access to sensitive system resources, modifying critical system files, or establishing persistent backdoors. The attack vectors described in the vulnerability assessment demonstrate the multi-faceted nature of exploitation possibilities, including web-based attacks through malicious websites and file sharing scenarios involving crafted documents. These attack methods align with ATT&CK techniques such as T1059 for command and scripting interpreter usage and T1068 for exploit for privilege escalation. The web-based attack scenario specifically utilizes social engineering tactics to convince users to navigate to malicious content, while file sharing attacks rely on convincing users to open malicious attachments.
Mitigation strategies for CVE-2020-1012 should prioritize immediate deployment of Microsoft security updates that address the memory handling issues within Wininit.dll. System administrators must ensure comprehensive patch management processes are in place to prevent exploitation attempts, particularly focusing on the Windows 10 and Windows Server 2016 operating systems where this vulnerability was most prevalent. Network segmentation and application whitelisting can provide additional defense layers by limiting the potential impact of successful exploitation attempts. Security monitoring should focus on detecting unusual privilege escalation events and abnormal memory access patterns that might indicate exploitation attempts. The vulnerability's remediation requires proper memory management practices in the Wininit.dll module, ensuring that all memory objects are properly validated and handled according to secure coding standards that prevent unauthorized code execution during system initialization processes.