CVE-2004-0045 in INN
Summary
by MITRE
Buffer overflow in the ARTpost function in art.c in the control message handling code for INN 2.4.0 may allow remote attackers to execute arbitrary code.
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Analysis
by VulDB Data Team • 07/13/2025
The vulnerability identified as CVE-2004-0045 represents a critical buffer overflow flaw within the INN (InterNetNews) news server software version 2.4.0. This issue specifically affects the ARTpost function located in the art.c source file, which handles control message processing within the news server infrastructure. The flaw exists in the control message handling code pathway, making it particularly dangerous as it could be exploited through network-based attacks targeting the news server's communication protocols. The vulnerability stems from insufficient input validation and boundary checking in the ARTpost function, which processes article posting control messages that are fundamental to news server operations.
The technical implementation of this buffer overflow occurs when the ARTpost function processes incoming control messages without adequate bounds checking on the data length. When maliciously crafted control messages are received, the function fails to properly validate the size of incoming data before copying it into fixed-length buffers. This allows attackers to overwrite adjacent memory locations, potentially corrupting program execution flow and enabling arbitrary code execution. The vulnerability is particularly concerning because it operates at the core control message processing layer, meaning that successful exploitation could provide attackers with complete control over the affected news server. The flaw aligns with CWE-121, which describes stack-based buffer overflow conditions, and represents a classic example of improper input validation leading to memory corruption.
From an operational perspective, this vulnerability creates significant risks for organizations relying on INN news servers for their news distribution infrastructure. Attackers could exploit this weakness to execute malicious code on vulnerable systems, potentially leading to complete system compromise, data exfiltration, or use of the compromised server as a launch point for further attacks within the network. The impact extends beyond individual server compromise as news servers often serve as critical infrastructure components in internet service provider networks and organizational communication systems. The vulnerability could be leveraged to gain unauthorized access to news server resources, modify or delete news articles, or even establish persistent backdoors for future access. This aligns with ATT&CK technique T1059, which covers command and script injection, and represents a common attack vector for privilege escalation and persistent access.
Mitigation strategies for CVE-2004-0045 should prioritize immediate patching of affected INN installations with versions that contain the necessary security fixes. Organizations should implement network segmentation to limit access to news server ports and consider deploying intrusion detection systems to monitor for suspicious control message patterns. Additional defensive measures include implementing proper input validation at network boundaries, enabling network access controls to restrict who can send control messages to the news server, and conducting regular security assessments of news server configurations. The vulnerability highlights the importance of maintaining up-to-date software versions and implementing robust security practices in network infrastructure components. Organizations should also consider implementing monitoring for unusual activity patterns that might indicate exploitation attempts, particularly around the news server's control message handling ports. Security teams should regularly review and test their incident response procedures to ensure preparedness for potential exploitation of similar buffer overflow vulnerabilities in other critical systems.