CVE-2005-2141 in TCP Chat
Summary
by MITRE
TCP Chat 1.0 allows remote attackers to cause a denial of service (crash) via a long string to the chat service, possibly triggering a buffer overflow.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 03/26/2019
The vulnerability identified as CVE-2005-2141 affects TCP Chat version 1.0, a network communication application that facilitates real-time text messaging over tcpip networks. This particular flaw represents a classic buffer overflow condition that occurs when the application fails to properly validate input length before processing incoming data. The vulnerability manifests when remote attackers send excessively long strings to the chat service, causing the application to crash and become unavailable to legitimate users. The flaw exists in the application's input handling mechanism where it does not implement proper bounds checking on incoming data streams, making it susceptible to memory corruption attacks that can lead to complete service disruption.
The technical implementation of this vulnerability stems from inadequate memory management practices within the tcp chat application's network processing code. When the service receives a malformed input string that exceeds predetermined buffer limits, the application's memory allocation routines fail to handle the overflow gracefully. This condition creates a situation where the excess data overflows into adjacent memory locations, potentially corrupting critical program state information or executing unintended code paths. The buffer overflow occurs at the application layer where user input is directly processed without proper sanitization or length validation, making it particularly dangerous for network services that accept external input. This type of vulnerability is categorized under CWE-121 as stack-based buffer overflow, representing a fundamental flaw in input validation and memory management practices that has been prevalent in legacy network applications.
The operational impact of this vulnerability extends beyond simple service disruption to potentially enable more sophisticated attack vectors. While the immediate effect is a denial of service condition that crashes the chat service, the underlying buffer overflow presents opportunities for attackers to escalate privileges or execute arbitrary code on the affected system. The vulnerability affects the availability aspect of the security triad by rendering the chat service inoperable and potentially compromising system integrity. Network administrators and security teams must consider this vulnerability as a potential entry point for more advanced persistent threats, especially in environments where the chat service operates with elevated privileges or serves as a communication hub for sensitive information exchanges. The attack surface is particularly concerning for organizations relying on legacy applications that lack proper security hardening measures.
Mitigation strategies for CVE-2005-2141 should focus on immediate defensive measures followed by comprehensive system hardening. The most effective immediate response involves implementing input length validation and sanitization at all network entry points, ensuring that the application enforces strict bounds checking on all incoming data streams. System administrators should consider deploying network level filters that limit the size of data packets accepted by the chat service, effectively preventing long string attacks before they reach the application layer. Additionally, implementing proper error handling and graceful degradation mechanisms can help maintain service availability even when malformed input is received. Organizations should also consider upgrading to more secure versions of chat applications or implementing application firewalls that can detect and block suspicious input patterns. The vulnerability demonstrates the critical importance of following secure coding practices and adheres to the principles outlined in the mitre attack framework where initial access often occurs through input validation flaws that can be exploited for privilege escalation and persistent access to target systems.