CVE-2003-0701 in Internet Explorer
Summary
by MITRE
Buffer overflow in Internet Explorer 6 SP1 for certain languages that support double-byte encodings (e.g., Japanese) allows remote attackers to execute arbitrary code via the Type property of an Object tag, a variant of CVE-2003-0344.
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Analysis
by VulDB Data Team • 12/31/2024
The vulnerability identified as CVE-2003-0701 represents a critical buffer overflow flaw in Internet Explorer 6 Service Pack 1 that specifically affects systems utilizing double-byte character encodings such as Japanese language support. This vulnerability stems from improper handling of input data within the browser's object tag processing mechanism, creating a pathway for remote code execution attacks. The flaw is particularly significant because it leverages the complex encoding requirements of double-byte character sets, which are commonly used in East Asian languages and require special handling within web browsers.
The technical implementation of this vulnerability occurs when Internet Explorer processes the Type property of an Object tag in HTML content. When the browser encounters double-byte encoded data, it fails to properly validate the length of the input buffer before copying data into memory locations. This inadequate bounds checking creates a condition where an attacker can craft malicious HTML content that exceeds the allocated buffer space, leading to memory corruption. The overflow specifically targets the browser's handling of ActiveX controls and object embedding mechanisms, which are fundamental components of Internet Explorer's web rendering engine. This flaw is classified under CWE-121 as a stack-based buffer overflow, where insufficient boundary checking allows attackers to overwrite adjacent memory locations.
The operational impact of this vulnerability extends beyond simple remote code execution to encompass complete system compromise when exploited successfully. Attackers can leverage this vulnerability to install malware, modify system files, or establish persistent backdoors on affected systems. The attack vector requires only that a user visit a malicious web page containing specially crafted HTML content, making it particularly dangerous in phishing campaigns and drive-by download scenarios. The vulnerability affects not just individual users but entire organizations, as it can be exploited through web-based attacks without requiring user interaction beyond normal browsing activities. This characteristic aligns with ATT&CK technique T1203 which describes exploitation of web applications for code execution.
Mitigation strategies for CVE-2003-0701 primarily focus on immediate patching and system hardening measures. Microsoft released security updates for Internet Explorer 6 SP1 that addressed the buffer overflow by implementing proper bounds checking and input validation for double-byte character handling. Organizations should prioritize deployment of these patches across all affected systems, particularly those running Japanese or other double-byte language configurations. Additional protective measures include implementing web application firewalls to filter malicious content, disabling ActiveX controls where possible, and employing user education programs to reduce exposure to malicious web content. Network segmentation and access controls can further limit the potential impact of successful exploitation attempts, while regular security assessments help identify systems that may have been compromised through this vulnerability. The vulnerability serves as a historical example of how complex character encoding support can introduce security flaws in software applications, emphasizing the importance of thorough testing and validation of internationalization features in security-critical applications.