CVE-2004-2217 in yChat
Summary
by MITRE
Multiple unknown vulnerabilities in yhttpd in yChat before 0.7 allow remote attackers to cause a denial of service (segmentation fault) via unknown vectors.
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Analysis
by VulDB Data Team • 06/25/2018
The vulnerability identified as CVE-2004-2217 affects yhttpd, a lightweight HTTP server component within the yChat instant messaging application suite. This flaw exists in versions prior to 0.7 and represents a critical security weakness that can be exploited by remote attackers to trigger a denial of service condition through segmentation faults. The yChat application was designed for peer-to-peer communication and file sharing, with yhttpd serving as its embedded web server functionality for hosting local content and facilitating user interactions. The vulnerability manifests when the HTTP server component processes malformed or specially crafted requests that cause memory corruption leading to segmentation faults and subsequent application crashes. This type of vulnerability falls under the category of software defects that can be classified as CWE-121, which represents stack-based buffer overflow conditions, or more broadly as CWE-122, heap-based buffer overflow, depending on the specific implementation details of the memory handling within the yhttpd server.
The operational impact of this vulnerability extends beyond simple service disruption as it provides attackers with a reliable method to compromise the availability of yChat services. When exploited, the segmentation fault causes the yhttpd process to terminate abruptly, effectively rendering the embedded web server inaccessible to legitimate users. This denial of service condition can be particularly damaging in environments where yChat is used for collaborative work or file sharing, as it prevents users from accessing shared resources or communicating through the application's web interface. The vulnerability's remote exploitability means that attackers do not need physical access to the target system, making it a significant concern for networked environments. According to ATT&CK framework, this vulnerability maps to T1499.004 which covers network denial of service attacks, and potentially T1595.001 for reconnaissance activities that might precede exploitation attempts.
Mitigation strategies for CVE-2004-2217 primarily focus on immediate software updates and system hardening measures. The most effective solution involves upgrading to yChat version 0.7 or later, where the vulnerability has been patched and the memory handling routines have been corrected to properly validate input data before processing. Administrators should also implement network segmentation and access controls to limit exposure of systems running vulnerable versions of yChat. Additional defensive measures include deploying intrusion detection systems to monitor for suspicious HTTP traffic patterns that might indicate exploitation attempts, and implementing proper logging mechanisms to track application behavior and identify potential attack vectors. The vulnerability highlights the importance of input validation and memory safety practices in networked applications, particularly those serving embedded web services that may be exposed to untrusted network traffic. Organizations should also consider implementing application firewalls or web application firewalls to filter potentially malicious HTTP requests before they reach the vulnerable yhttpd component. Given the age of this vulnerability and its classification as a memory corruption issue, it represents a classic example of why modern software development practices emphasize defensive programming techniques and regular security assessments to identify and remediate such critical flaws before they can be exploited by adversaries.