CVE-2000-0160 in Internet Explorer
Summary
by MITRE
The Microsoft Active Setup ActiveX component in Internet Explorer 4.x and 5.x allows a remote attacker to install software components without prompting the user by stating that the software's manufacturer is Microsoft.
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Analysis
by VulDB Data Team • 04/20/2026
The vulnerability described in CVE-2000-0160 represents a critical security flaw in Microsoft Internet Explorer versions 4.x and 5.x that exploits the Active Setup functionality within the browser's ActiveX component architecture. This vulnerability specifically targets the trust model that Internet Explorer employs when processing ActiveX controls, creating an avenue for malicious actors to bypass user consent mechanisms and silently install software components on target systems. The flaw leverages the legitimate Active Setup infrastructure that Microsoft designed to manage software deployment and configuration updates, but it allows attackers to manipulate this system to install arbitrary components without user awareness or approval. The vulnerability is particularly dangerous because it exploits the implicit trust users place in Microsoft-signed components, making the attack vector more convincing and harder to detect.
The technical implementation of this vulnerability stems from how Internet Explorer handles the Active Setup process when encountering ActiveX controls. When a malicious ActiveX component is loaded, the vulnerability allows the attacker to manipulate the component's installation behavior by spoofing the manufacturer identification as Microsoft. This manipulation occurs through the component's registry entries and installation parameters, which are processed by the Active Setup mechanism without proper validation of the actual component source. The flaw essentially enables attackers to bypass the standard user interaction requirements that would normally prompt users to confirm software installation, instead allowing the installation to proceed silently in the background. This behavior directly violates the principle of least privilege and user consent that forms the foundation of secure software installation practices.
The operational impact of CVE-2000-0160 is substantial and multifaceted, creating significant risks for organizations and individual users who were running affected versions of Internet Explorer. Attackers could leverage this vulnerability to deploy malware, keyloggers, backdoors, or other malicious software without user knowledge, effectively creating a persistent threat vector that could remain undetected for extended periods. The silent installation capability means that security monitoring systems might not detect the compromise, as no user prompts or warnings would appear during the attack. Organizations faced the additional challenge of having to retrofit their security measures to account for this vulnerability, as it essentially undermined the browser's built-in security mechanisms. The vulnerability also highlighted the broader risks associated with ActiveX controls and the trust model they implemented, leading to increased scrutiny of similar technologies and prompting Microsoft to reevaluate their approach to component-based software installation.
Mitigation strategies for this vulnerability required immediate action from affected organizations, including the deployment of security patches provided by Microsoft and the implementation of additional security controls. The primary fix involved updating Internet Explorer to versions that addressed the Active Setup implementation flaws and improved validation of component sources. Organizations should have implemented network-level controls to restrict access to potentially malicious ActiveX components and deployed enhanced monitoring solutions to detect unauthorized software installations. The vulnerability also prompted the development of more robust security practices around ActiveX control management, including the implementation of software restriction policies and the establishment of more stringent validation procedures for component installations. From a compliance perspective, this vulnerability highlighted the importance of maintaining up-to-date security patches and demonstrated the critical need for organizations to implement comprehensive vulnerability management processes that could quickly respond to emerging threats.
This vulnerability aligns with several cybersecurity frameworks and threat modeling approaches, including the Common Weakness Enumeration classification system where such flaws would be categorized under weaknesses related to trust management and component validation. The attack pattern corresponds to the attack technique described in the MITRE ATT&CK framework under the category of "Exploitation for Privilege Escalation" and "Persistence" mechanisms, as the vulnerability allowed attackers to silently install persistent components on target systems. The vulnerability also demonstrates the principles outlined in the OWASP Top Ten security risks, particularly concerning the risks associated with insecure component interactions and the exploitation of trust relationships within software ecosystems. Organizations that failed to address this vulnerability effectively would have been exposed to long-term security risks, as the silent installation capability created a persistent threat that could be leveraged for data exfiltration, system compromise, or further attack escalation. The incident served as a catalyst for the development of more secure software installation paradigms and highlighted the critical importance of proper validation and verification of software components before installation.