CVE-2003-1326 in Internet Explorer
Summary
by MITRE
Microsoft Internet Explorer 5.5 and 6.0 allows remote attackers to bypass the cross-domain security model to run malicious script or arbitrary programs via dialog boxes, aka "Improper Cross Domain Security Validation with dialog box."
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Analysis
by VulDB Data Team • 06/28/2021
This vulnerability resides in Microsoft Internet Explorer versions 5.5 and 6.0, specifically targeting the browser's cross-domain security model implementation. The flaw manifests when the browser fails to properly validate cross-domain security boundaries during dialog box operations, creating a path for malicious actors to execute unauthorized code across different security domains. The vulnerability is categorized under CWE-285 which deals with improper authorization in security controls, and it directly relates to the broader category of cross-site scripting attacks that have plagued web browsers for decades.
The technical exploitation occurs when Internet Explorer processes dialog boxes that should normally be restricted by cross-domain policies. Attackers can craft malicious web content that, when executed in the browser, leverages the flawed dialog box handling to bypass security restrictions. This allows remote attackers to inject and execute malicious scripts or arbitrary programs that would normally be blocked by the browser's security model. The vulnerability essentially creates a loophole in the security sandbox that protects users from cross-domain attacks, enabling attackers to escalate privileges and execute code in contexts where it should be prohibited.
The operational impact of this vulnerability is significant as it allows remote code execution without requiring user interaction beyond visiting a malicious website. An attacker can construct a webpage that, when loaded in Internet Explorer 5.5 or 6.0, triggers a dialog box that bypasses security restrictions to execute arbitrary code on the victim's system. This represents a critical security flaw that could enable full system compromise, data theft, or further attack propagation. The vulnerability affects users who are running outdated browser versions, making it particularly dangerous as many organizations were still using these older versions at the time of discovery.
Mitigation strategies should focus on immediate browser upgrades to supported versions that have proper cross-domain security validation. Organizations should implement network-level protections such as content filtering and web application firewalls to detect and block malicious dialog box operations. Browser security settings should be hardened by disabling unnecessary features and dialog box interactions. The vulnerability demonstrates the importance of proper input validation and security boundary enforcement as outlined in the OWASP Top 10 security controls. Additionally, regular security updates and patch management processes should be implemented to ensure all systems are protected against known vulnerabilities. This case study highlights the critical nature of maintaining up-to-date security implementations and the potential consequences of inadequate cross-domain security controls in web browsers.