CVE-2000-1034 in Windows
Summary
by MITRE
Buffer overflow in the System Monitor ActiveX control in Windows 2000 allows remote attackers to execute arbitrary commands via a long LogFileName parameter in HTML source code, aka the "ActiveX Parameter Validation" vulnerability.
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Analysis
by VulDB Data Team • 02/07/2019
The vulnerability identified as CVE-2000-1034 represents a critical buffer overflow flaw within the System Monitor ActiveX control component of Microsoft Windows 2000 operating systems. This issue specifically affects the validation mechanisms employed by ActiveX controls when processing user-supplied parameters, creating an exploitable condition that can be leveraged by remote attackers to gain unauthorized system access. The vulnerability stems from inadequate input validation within the LogFileName parameter handling of the System Monitor ActiveX control, which fails to properly sanitize or limit the length of input data.
The technical implementation of this vulnerability occurs through the manipulation of HTML source code that references the vulnerable ActiveX control. When a maliciously crafted HTML page containing an overly long LogFileName parameter is rendered by Internet Explorer, the buffer overflow condition is triggered. This overflow occurs in the memory allocation associated with the ActiveX control's parameter processing, where insufficient bounds checking allows an attacker to overwrite adjacent memory locations. The flaw operates at the kernel level within the Windows 2000 operating system, specifically within the ActiveX control framework that governs component interaction and memory management.
The operational impact of this vulnerability extends beyond simple denial of service conditions, as it provides attackers with the capability to execute arbitrary code with the privileges of the compromised user. This represents a significant elevation in attack surface, particularly in environments where users may inadvertently browse to malicious websites or receive crafted emails containing malicious HTML content. The vulnerability's remote exploitability means that attackers need not have physical access to target systems, enabling widespread compromise across networked environments. According to CWE classification, this vulnerability maps to CWE-121, which describes heap-based buffer overflow conditions, and aligns with ATT&CK technique T1059 for command and scripting interpreter execution.
Mitigation strategies for CVE-2000-1034 require immediate implementation of security patches provided by Microsoft, specifically the cumulative security update that addresses the ActiveX control validation flaw. Organizations should implement comprehensive browser security configurations that disable or restrict ActiveX control execution, particularly in high-risk environments. Network segmentation and firewall rules can help limit the potential impact of exploitation attempts, while user education regarding safe browsing practices remains crucial for preventing accidental exploitation. The vulnerability also highlights the importance of regular security assessments and vulnerability management programs, as it demonstrates how seemingly minor input validation flaws can create significant security risks. System monitoring and intrusion detection systems should be configured to detect anomalous ActiveX control behavior, and administrators should maintain updated threat intelligence to identify potential exploitation attempts targeting this specific vulnerability.