CVE-1999-0669 in Internet Explorer
Summary
by MITRE
The Eyedog ActiveX control is marked as "safe for scripting" for Internet Explorer, which allows a remote attacker to execute arbitrary commands as demonstrated by Bubbleboy.
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Analysis
by VulDB Data Team • 02/21/2025
The CVE-1999-0669 vulnerability represents a critical security flaw in the Eyedog ActiveX control that was widely exploited in the late 1990s. This vulnerability specifically targeted Internet Explorer's security model by leveraging the "safe for scripting" designation that was improperly applied to the ActiveX control. The designation allowed the control to execute code within the browser context without proper security restrictions, creating a significant attack surface that malicious actors could exploit to gain unauthorized system access.
The technical implementation of this vulnerability stemmed from Microsoft's security model for ActiveX controls, where components marked as "safe for scripting" were permitted to execute code within the browser's security context. The Eyedog control was incorrectly configured to receive this designation, enabling attackers to manipulate the control through malicious web pages. The vulnerability was demonstrated through the Bubbleboy exploit, which exploited the control's improper security attributes to execute arbitrary commands on vulnerable systems. This flaw directly relates to CWE-431, which addresses the improper handling of security attributes in software components, and demonstrates how incorrect security labeling can lead to privilege escalation and code execution.
The operational impact of CVE-1999-0669 was severe and widespread, as it allowed remote attackers to execute arbitrary commands on vulnerable systems without requiring user interaction beyond visiting a malicious webpage. The vulnerability was particularly dangerous because it could be exploited through simple web browsing activities, making it an ideal candidate for mass exploitation campaigns. Systems running Internet Explorer with the affected Eyedog control were at risk of complete compromise, as attackers could execute commands with the privileges of the logged-in user. The exploit could be used to install malware, modify system files, steal sensitive information, or establish persistent access to compromised systems, making it a significant threat to enterprise security environments.
The remediation for this vulnerability required immediate action from system administrators to either update the affected ActiveX control to a secure version or remove it entirely from affected systems. Microsoft released patches to address the security flaw, but the vulnerability demonstrated the broader challenges of ActiveX security management in the late 1990s. Organizations had to implement comprehensive patch management processes and conduct security assessments to identify other potentially vulnerable ActiveX controls. This vulnerability contributed to the eventual decline of ActiveX technology and influenced the development of more secure web standards. The incident highlighted the importance of proper security attribute configuration and the dangers of overly permissive security models in browser environments, aligning with ATT&CK technique T1195 which addresses the exploitation of web-based vulnerabilities for code execution. Organizations needed to establish more rigorous security practices for evaluating and managing ActiveX controls, emphasizing the principle of least privilege and proper security model implementation to prevent similar vulnerabilities from being exploited in the future.