CVE-2002-1187 in Internet Explorer
Summary
by MITRE
Cross-site scripting vulnerability (XSS) in Internet Explorer 5.01 through 6.0 allows remote attackers to read and execute files on the local system via web pages using the <frame> or <iframe> element and javascript, aka "Frames Cross Site Scripting," as demonstrated using the PrivacyPolicy.dlg resource.
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Analysis
by VulDB Data Team • 06/14/2025
The vulnerability identified as CVE-2002-1187 represents a critical cross-site scripting flaw affecting Internet Explorer versions 5.01 through 6.0, categorized under CWE-79 - Improper Neutralization of Input During Web Page Generation. This vulnerability specifically exploits the browser's handling of frame and iframe elements combined with javascript execution, creating a pathway for remote attackers to gain unauthorized access to local system resources. The attack vector leverages the Frames Cross Site Scripting technique where malicious code embedded within frame structures can bypass security restrictions and execute with the privileges of the user's browser session.
The technical exploitation occurs through the manipulation of html frame elements that allow attackers to inject malicious javascript code into web pages. When Internet Explorer processes these crafted frames, it fails to properly sanitize the input, enabling the execution of arbitrary code on the victim's local system. The vulnerability is particularly dangerous because it can be triggered through legitimate web page structures, making it difficult to detect and prevent. The demonstration using the PrivacyPolicy.dlg resource shows how attackers can leverage existing browser components to create malicious payloads that appear legitimate to users.
The operational impact of this vulnerability extends beyond simple data theft, as it enables full system compromise through file execution and potential privilege escalation. Attackers can leverage this vulnerability to read local files, execute arbitrary commands, and potentially establish persistent access to compromised systems. The attack can be delivered through various means including malicious websites, email attachments, or compromised web applications that contain the crafted frame elements. This vulnerability affects organizations using legacy internet explorer versions and represents a significant risk to enterprise security environments where older browsers remain in use.
Mitigation strategies for CVE-2002-1187 require immediate browser updates to supported versions and implementation of proper input validation controls. Organizations should deploy web application firewalls that can detect and block malicious frame injection attempts, while also implementing content security policies to restrict frame loading from untrusted sources. The vulnerability aligns with ATT&CK technique T1059.007 - Command and Scripting Interpreter: JavaScript, demonstrating how attackers can leverage browser scripting capabilities for system compromise. Additionally, security measures should include user education regarding suspicious web content and regular security assessments to identify potential exploitation vectors. The vulnerability also highlights the importance of proper web application security development practices and adherence to secure coding standards to prevent similar issues in modern web applications.