CVE-2004-0978 in Internet Explorer
Summary
by MITRE
Heap-based buffer overflow in the Hrtbeat.ocx (Heartbeat) ActiveX control for Internet Explorer 5.01 through 6, when users who visit online gaming sites that are associated with MSN, allows remote attackers to execute arbitrary code via the SetupData parameter.
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Analysis
by VulDB Data Team • 01/03/2025
The vulnerability described in CVE-2004-0978 represents a critical heap-based buffer overflow within the Hrtbeat.ocx ActiveX control, which was shipped with Internet Explorer versions 5.01 through 6.0. This flaw specifically affects users visiting online gaming sites that are associated with MSN services, creating a sophisticated attack vector that leverages the trust relationship between web browsers and ActiveX controls. The vulnerability is classified under CWE-121 as a heap-based buffer overflow, which occurs when more data is written to a heap-allocated buffer than it can accommodate, leading to memory corruption and potential code execution.
The technical exploitation of this vulnerability hinges on the improper handling of the SetupData parameter within the Heartbeat ActiveX control. When Internet Explorer processes a web page containing maliciously crafted SetupData parameters, the control fails to validate input length before copying data into a fixed-size buffer allocated on the heap. This buffer overflow condition allows attackers to overwrite adjacent memory locations, potentially corrupting the stack or heap structures. The vulnerability is particularly dangerous because it enables remote code execution without requiring any user interaction beyond visiting a malicious web page, making it a prime candidate for drive-by download attacks that were prevalent during the early 2000s era of web security.
The operational impact of CVE-2004-0978 extends beyond simple code execution, as it represents a significant compromise of system integrity and user security. Attackers exploiting this vulnerability could gain complete control over affected systems, potentially installing malware, stealing sensitive information, or using compromised machines as part of botnets. The attack surface is particularly wide given that Internet Explorer 5.01 through 6.0 were widely deployed across enterprise and consumer environments, making this vulnerability a prime target for mass exploitation campaigns. This vulnerability also aligns with ATT&CK technique T1190, which describes exploitation of remote services, and T1059, which covers command and scripting interpreter usage, as successful exploitation would enable attackers to execute arbitrary commands on compromised systems.
The remediation of this vulnerability requires immediate patching of affected systems through Microsoft security updates, as well as the implementation of security measures such as ActiveX control restrictions and browser security settings. Organizations should disable ActiveX controls in Internet Explorer unless absolutely necessary for business operations, and implement web application firewalls to detect and block malicious SetupData parameter values. The vulnerability also underscores the importance of proper input validation and bounds checking in software development practices, as it demonstrates how insufficient parameter validation can lead to critical security flaws. Additionally, this vulnerability highlights the risks associated with outdated software versions and the necessity of maintaining up-to-date security patches, as Internet Explorer versions 5.01 through 6.0 were long out of support by the time this vulnerability was discovered, making proper patch management crucial for system protection against similar attacks.