CVE-2003-0344 in Internet Explorer
Summary
by MITRE
Buffer overflow in Microsoft Internet Explorer 5.01, 5.5, and 6.0 allows remote attackers to execute arbitrary code via / (slash) characters in the Type property of an Object tag in a web page.
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Analysis
by VulDB Data Team • 12/31/2024
The vulnerability identified as CVE-2003-0344 represents a critical buffer overflow flaw affecting Microsoft Internet Explorer versions 5.01, 5.5, and 6.0. This security issue resides in the handling of HTML Object tags and specifically targets the Type property which processes slash characters in a manner that can lead to memory corruption. The flaw manifests when a malicious web page contains an Object tag with a specially crafted Type attribute containing slash characters that exceed the allocated buffer space. This vulnerability falls under the CWE-121 buffer overflow category, which is classified as a common weakness in software design where data written to a buffer exceeds the buffer's capacity and overwrites adjacent memory locations. The attack vector leverages the web browser's HTML parsing mechanism to execute arbitrary code on the victim's system through a remote web page, making it particularly dangerous in the context of web-based attacks.
The technical implementation of this vulnerability exploits the insecure memory management practices within Internet Explorer's object handling routines. When the browser encounters an Object tag with a Type property containing slash characters, the parsing logic fails to properly validate the input length against the buffer boundaries. This results in a classic stack-based buffer overflow where the excessive data overwrites the return address of the calling function and potentially other critical memory segments. The overflow can be triggered by simply visiting a malicious web page containing the crafted Object tag, without requiring any additional user interaction or privilege escalation. The ATT&CK framework categorizes this as a code injection technique under the T1059.007 sub-technique, specifically targeting the web browser as the attack surface. The vulnerability demonstrates how improper input validation in HTML rendering engines can create pathways for remote code execution, particularly when dealing with dynamic content parsing and object instantiation.
The operational impact of CVE-2003-0344 extends beyond simple remote code execution to encompass complete system compromise and potential data exfiltration. Attackers can leverage this vulnerability to install malware, modify system files, or establish persistent backdoors on affected systems. The widespread adoption of Internet Explorer 5.x and 6.0 made this vulnerability particularly dangerous, as millions of users were potentially exposed to remote exploitation. Organizations running these browser versions faced significant risk of targeted attacks, especially in corporate environments where web browsing was essential for business operations. The vulnerability's exploitation typically results in immediate privilege escalation to the user context of the browser process, often running with elevated privileges on Windows systems. This makes it a prime target for attackers seeking to establish footholds in network environments, as the compromised browser can serve as a launching point for further lateral movement and privilege escalation attacks.
Mitigation strategies for CVE-2003-0344 centered primarily on immediate browser updates and security patches provided by Microsoft. The most effective solution involved upgrading to Microsoft Internet Explorer 7.0 or later versions which contained fixed implementations of the Object tag handling routines. Organizations also implemented network-based mitigations including web application firewalls and content filtering systems that could detect and block malicious Object tags containing slash characters. Security administrators should have enforced strict browser compatibility policies and deprecated support for older Internet Explorer versions. The vulnerability highlighted the importance of input validation and memory safety practices in web browser development, leading to improved security standards in subsequent browser releases. Additional protective measures included disabling ActiveX controls, implementing sandboxing mechanisms, and deploying intrusion detection systems to monitor for exploitation attempts. This vulnerability served as a catalyst for improved security practices in web browser vendors and underscored the critical need for regular security updates and comprehensive vulnerability management programs. The incident demonstrated how seemingly minor parsing flaws in widely used software could create significant security risks, emphasizing the importance of security testing and code review processes in software development lifecycle.