CVE-2000-0826 in DocumentDirect for the Internet
Summary
by MITRE
Buffer overflow in ddicgi.exe program in Mobius DocumentDirect for the Internet 1.2 allows remote attackers to execute arbitrary commands via a long GET request.
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Analysis
by VulDB Data Team • 10/12/2025
The vulnerability identified as CVE-2000-0826 represents a critical buffer overflow flaw within the ddicgi.exe component of Mobius DocumentDirect for the Internet version 1.2. This web server extension operates as a Common Gateway Interface application that processes HTTP requests and translates them into commands for the underlying document management system. The buffer overflow occurs specifically when handling GET requests that exceed the allocated memory buffer size, creating an exploitable condition that can be leveraged by remote attackers to gain unauthorized control over the affected system. The flaw stems from inadequate input validation and bounds checking within the application's request processing logic, where user-supplied data is directly copied into fixed-length buffers without proper size verification.
The technical exploitation of this vulnerability follows a classic buffer overflow attack pattern that aligns with CWE-121, which describes conditions where a buffer is written beyond its allocated bounds. When a remote attacker crafts a malicious GET request containing an excessive amount of data, the ddicgi.exe process fails to properly validate the input length before copying it into internal buffers. This results in memory corruption that can overwrite adjacent memory locations including return addresses and control data structures. The vulnerability is particularly dangerous because it operates at the web server level, allowing attackers to execute arbitrary commands with the privileges of the web server process, which typically runs with elevated system permissions. Attackers can potentially leverage this to gain full system control, install backdoors, or escalate privileges to administrative levels.
The operational impact of CVE-2000-0826 extends beyond simple remote code execution, as it fundamentally compromises the security posture of any system running the vulnerable Mobius DocumentDirect software. Organizations utilizing this web server component face significant risk of unauthorized access, data breaches, and potential complete system compromise. The vulnerability's remote nature means that attackers do not require physical access or local network presence to exploit the flaw, making it particularly dangerous for publicly accessible web servers. From an ATT&CK framework perspective, this vulnerability maps to techniques involving remote code execution and privilege escalation, specifically targeting the T1059.007 sub-technique for command and scripting interpreter execution. The attack surface is further expanded by the fact that the vulnerability affects a document management system that often contains sensitive corporate data, making successful exploitation potentially devastating for organizations that rely on document handling and collaboration features.
Mitigation strategies for this vulnerability require immediate patching of the affected Mobius DocumentDirect software to version 1.3 or later, which includes proper input validation and buffer management fixes. Organizations should also implement network segmentation to limit access to the vulnerable web server, deploy intrusion detection systems to monitor for suspicious GET request patterns, and consider disabling unnecessary CGI components when not actively required. The remediation process must include comprehensive testing of patched environments to ensure that the buffer overflow protections are properly implemented. Additionally, organizations should conduct thorough vulnerability assessments to identify other potentially affected systems and ensure proper input sanitization practices are implemented across all web applications. Security monitoring should be enhanced to detect anomalous request lengths and patterns that may indicate exploitation attempts, while access controls should be reviewed to minimize the potential impact of successful attacks. This vulnerability demonstrates the critical importance of proper input validation and memory management in web server applications, particularly those handling user-supplied data through HTTP protocols.