CVE-2002-0552 in Chat System
Summary
by MITRE
Multiple buffer overflows in Melange Chat server 2.02 allow remote or local attackers to cause a denial of service (crash) and possibly execute arbitrary code via (1) a long argument in the /yell command, (2) long lines in the /etc/melange.conf configuration file, (3) long file names, or possibly other attacks.
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Analysis
by VulDB Data Team • 09/16/2025
The vulnerability identified as CVE-2002-0552 represents a critical security flaw in the Melange Chat server version 2.02 that exposes multiple buffer overflow conditions affecting the application's core functionality. This vulnerability operates under the Common Weakness Enumeration framework as CWE-121, which categorizes heap-based buffer overflows, and CWE-122, which addresses stack-based buffer overflows, depending on the specific attack vector exploited. The Melange Chat server's failure to properly validate input lengths across various command interfaces creates a dangerous attack surface that can be leveraged by both remote and local adversaries to compromise system integrity.
The technical implementation of this vulnerability manifests through several distinct attack vectors that all stem from improper input validation and memory management practices within the chat server application. The first vector involves the /yell command where attackers can provide excessively long arguments that exceed the allocated buffer space, causing the application to overwrite adjacent memory locations and potentially execute malicious code. The second vector targets the /etc/melange.conf configuration file where long lines can trigger buffer overflows during parsing operations, while the third vector exploits long file names that exceed buffer capacity during file handling operations. These buffer overflow conditions occur due to the application's failure to implement proper bounds checking mechanisms, allowing attackers to manipulate memory layout and execute arbitrary code with the privileges of the running process.
The operational impact of CVE-2002-0552 extends beyond simple denial of service conditions to encompass potential system compromise and unauthorized code execution. When exploited, these buffer overflows can cause the Melange Chat server to crash and terminate unexpectedly, leading to service disruption that affects legitimate users and potentially creating a denial of service condition for the entire chat infrastructure. However, the more severe implications arise when attackers successfully leverage these vulnerabilities to execute arbitrary code, which could allow them to gain unauthorized access to the system, escalate privileges, or establish persistent backdoors. The vulnerability's classification under the MITRE ATT&CK framework places it within the 'Command and Control' and 'Execution' phases, specifically targeting 'T1059 Command and Scripting Interpreter' and 'T1068 Exploitation for Privilege Escalation' techniques that attackers use to maintain persistent access.
Mitigation strategies for CVE-2002-0552 require immediate implementation of input validation controls and memory management improvements within the Melange Chat server application. Organizations should implement strict bounds checking for all user inputs across all command interfaces, particularly focusing on command arguments, configuration file parsing, and file name handling operations. The recommended approach involves applying defensive programming practices such as using secure string handling functions, implementing proper buffer size validation, and employing stack canaries or other memory protection mechanisms. Additionally, system administrators should consider implementing network segmentation to limit access to the chat server, deploy intrusion detection systems to monitor for exploitation attempts, and ensure that the application runs with minimal required privileges to limit potential damage from successful exploitation. Regular security updates and patches should be applied immediately upon availability, as the vulnerability affects an older version of the software that likely lacks modern security hardening features. The vulnerability's age and the specific nature of the buffer overflows make it particularly susceptible to exploitation using automated tools, emphasizing the critical need for immediate remediation to prevent unauthorized access to systems running vulnerable versions of the Melange Chat server.