CVE-2000-0828 in DocumentDirect for the Internet
Summary
by MITRE
Buffer overflow in ddicgi.exe in Mobius DocumentDirect for the Internet 1.2 allows remote attackers to execute arbitrary commands via a long User-Agent parameter.
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Analysis
by VulDB Data Team • 06/08/2025
The vulnerability identified as CVE-2000-0828 represents a critical buffer overflow flaw in the ddicgi.exe component of Mobius DocumentDirect for the Internet version 1.2. This software package was designed to facilitate document sharing and collaboration over internet protocols, but the buffer overflow vulnerability creates a significant security risk that can be exploited by remote attackers. The flaw specifically manifests when the application processes HTTP requests containing an excessively long User-Agent header parameter, which is a standard HTTP header field used by web browsers and other clients to identify themselves to web servers. The vulnerability falls under the CWE-121 category of stack-based buffer overflow, where the application fails to properly validate input length before copying data into fixed-size memory buffers. This type of vulnerability is particularly dangerous because it can lead to complete system compromise when exploited by malicious actors.
The technical implementation of this vulnerability occurs within the ddicgi.exe process which serves as the CGI (Common Gateway Interface) handler for the Mobius DocumentDirect application. When a remote attacker sends an HTTP request with an overly long User-Agent string, the application's input validation mechanisms fail to properly check the buffer boundaries before copying the data. This allows the attacker to overwrite adjacent memory locations including return addresses and control data, potentially enabling arbitrary code execution with the privileges of the affected process. The vulnerability is classified as a remote attack vector since it does not require local system access or authentication, making it particularly attractive to attackers who can target systems running the vulnerable software without prior access. The specific nature of this buffer overflow aligns with ATT&CK technique T1203, which involves the exploitation of software vulnerabilities to gain unauthorized access and execute malicious code.
The operational impact of this vulnerability extends beyond simple command execution, as it provides attackers with potential persistence mechanisms and escalation capabilities within compromised systems. Once successfully exploited, attackers can gain full control over the affected server or client systems, potentially using the compromised environment as a launching point for further attacks against internal networks. The vulnerability affects organizations that rely on Mobius DocumentDirect for document management and collaboration, creating risks for data confidentiality, integrity, and availability. Organizations may experience unauthorized data access, system compromise, and potential data exfiltration. The attack surface is particularly concerning given that many organizations in 2000 were still implementing basic security measures, making such vulnerabilities more likely to be successfully exploited. Security professionals should note that this vulnerability demonstrates the importance of input validation and the critical need for proper buffer management in web application development, with implications for the broader security community's understanding of how to prevent similar issues in modern applications.
Mitigation strategies for CVE-2000-0828 should focus on immediate patching of affected systems, as the vendor likely released updates to address this specific buffer overflow vulnerability. Organizations should implement network segmentation to limit exposure of systems running vulnerable software, deploy intrusion detection systems to monitor for suspicious User-Agent patterns, and consider disabling unnecessary CGI functionality when not required. The vulnerability highlights the importance of following secure coding practices such as implementing proper input validation, using safe string handling functions, and conducting regular security code reviews. Additionally, organizations should establish comprehensive vulnerability management processes that include regular security assessments and prompt patch deployment to prevent exploitation of known vulnerabilities. The incident serves as a historical example of how buffer overflow vulnerabilities can be leveraged for remote code execution, emphasizing the need for robust software security practices and the importance of addressing security flaws proactively rather than reactively.