CVE-2004-1568 in Server
Summary
by MITRE
Directory traversal vulnerability in ParaChat Server 5.5 allows remote attackers to read arbitrary files via a ..%5C (hex-encoded dot dot) in the URL.
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Analysis
by VulDB Data Team • 06/23/2018
The vulnerability identified as CVE-2004-1568 represents a critical directory traversal flaw within ParaChat Server version 5.5, a web-based chat server application that was widely used in enterprise environments during the early 2000s. This security weakness stems from inadequate input validation mechanisms within the application's URL processing logic, specifically failing to properly sanitize or normalize path references that contain encoded directory traversal sequences. The vulnerability manifests when the server receives requests containing the hex-encoded sequence ..%5C which represents a directory traversal attempt using backslash encoding. This particular encoding method exploits the server's failure to properly decode and validate incoming URL parameters before processing file system requests, creating an opportunity for attackers to bypass normal access controls and retrieve arbitrary files from the underlying operating system.
The technical exploitation of this vulnerability leverages the fundamental principle of path traversal attacks where attackers manipulate URL parameters to navigate outside the intended directory structure and access restricted files. In this case, the hex-encoded dot dot backslash sequence ..%5C allows attackers to traverse up directory levels and access files that should normally be protected from external access. The vulnerability is particularly dangerous because it operates at the application layer, requiring no special privileges or access to the underlying system beyond a standard network connection to the affected server. This type of vulnerability maps directly to CWE-22, which specifically addresses Improper Limitation of a Pathname to a Restricted Directory, and aligns with ATT&CK technique T1083, which covers File and Directory Discovery as part of the reconnaissance phase in cyber operations.
The operational impact of this vulnerability extends far beyond simple information disclosure, as it provides attackers with the capability to access sensitive system files, configuration data, and potentially user credentials stored within the application's file system. Attackers could leverage this vulnerability to extract database connection strings, application configuration files, user authentication data, and other critical system information that could lead to further exploitation or lateral movement within the network. The vulnerability affects not only the immediate application but also potentially exposes the entire server infrastructure to unauthorized access, as the attacker could access files outside the web root directory and potentially gain access to system binaries, logs, and other sensitive resources. This type of vulnerability is particularly concerning in enterprise environments where chat servers often contain sensitive communications data and may be configured with elevated privileges.
Mitigation strategies for CVE-2004-1568 should focus on immediate patching of the ParaChat Server software to the latest available version that contains proper input validation and path normalization routines. Organizations should implement comprehensive network segmentation to limit access to the chat server and employ web application firewalls that can detect and block suspicious URL patterns containing directory traversal sequences. Additionally, system administrators should conduct thorough file system audits to identify and remove any unnecessary files that might be accessible through this vulnerability, while implementing proper access controls and privilege separation to limit the impact of successful exploitation attempts. The vulnerability demonstrates the importance of proper input validation and the principle of least privilege in application security design, as these fundamental security measures could have prevented the vulnerability from existing in the first place. Organizations should also consider implementing automated vulnerability scanning tools that can detect similar path traversal vulnerabilities in other applications and systems within their infrastructure.