CVE-2002-1351 in Chat System
Summary
by MITRE
Buffer overflow in Melange Chat System 1.10 allows remote attackers to cause a denial of service (chat server crash) and possibly execute arbitrary code via the msgText buffer in the chat_InterpretData function, as demonstrated via a long Nick (nickname) request.
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Analysis
by VulDB Data Team • 12/11/2024
The vulnerability identified as CVE-2002-1351 represents a critical buffer overflow flaw within the Melange Chat System version 1.10 that exposes the application to remote exploitation. This security weakness resides in the chat_InterpretData function where the msgText buffer fails to properly validate input length, creating an opportunity for malicious actors to manipulate the system through carefully crafted nickname requests. The flaw demonstrates characteristics consistent with CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The vulnerability operates through a straightforward exploitation vector where an attacker can send a specially crafted message containing an excessively long nickname that triggers the buffer overflow during processing. This particular implementation allows for both denial of service conditions that crash the chat server and potentially more severe arbitrary code execution capabilities, making it a significant threat to chat system availability and integrity. The attack surface is particularly concerning as it requires no authentication and can be executed remotely, making it accessible to anyone who can connect to the vulnerable chat server.
The operational impact of this vulnerability extends beyond simple service disruption to encompass potential system compromise and data integrity violations. When exploited, the buffer overflow can cause the chat server to crash and restart, resulting in denial of service that prevents legitimate users from accessing the chat functionality. However, the more dangerous aspect involves the potential for arbitrary code execution, which could allow attackers to gain control of the server, install backdoors, or exfiltrate sensitive information from connected users. The vulnerability's exploitation through the Nick request mechanism means that any user who attempts to join the chat with an overly long nickname could trigger the flaw, making it particularly dangerous in public chat environments where user input is not filtered or validated. This type of vulnerability aligns with ATT&CK technique T1203, which covers exploitation for persistence and privilege escalation through buffer overflow attacks. The memory corruption resulting from this flaw can be leveraged to overwrite critical program execution pointers, potentially redirecting the flow of execution to malicious code injected by the attacker.
Mitigation strategies for CVE-2002-1351 must address both immediate defensive measures and long-term architectural improvements to prevent similar vulnerabilities from occurring. The most effective immediate solution involves implementing proper input validation and bounds checking within the chat_InterpretData function to ensure that nickname lengths are strictly enforced and that no buffer overflow conditions can occur during message processing. System administrators should also consider implementing network-level protections such as rate limiting and connection filtering to reduce the attack surface and prevent exploitation attempts. The implementation of proper memory management techniques including stack canaries, address space layout randomization, and non-executable stack protections can significantly reduce the likelihood of successful exploitation even if input validation fails. Organizations should also establish robust monitoring and logging mechanisms to detect potential exploitation attempts and respond quickly to any signs of compromise. Additionally, regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in other legacy applications and ensure that proper input validation practices are maintained throughout the system architecture. The vulnerability serves as a reminder of the importance of following secure coding practices and adhering to established security standards such as those outlined in the OWASP Top Ten and NIST cybersecurity guidelines to prevent buffer overflow vulnerabilities from compromising system integrity and availability.