CVE-2001-0186 in Free Java Web Server
Summary
by MITRE
Directory traversal vulnerability in Free Java Web Server 1.0 allows remote attackers to read arbitrary files via a .. (dot dot) attack.
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Analysis
by VulDB Data Team • 04/07/2019
The vulnerability identified as CVE-2001-0186 represents a critical directory traversal flaw in the Free Java Web Server version 1.0, classified under CWE-22 according to the Common Weakness Enumeration framework. This security weakness enables malicious actors to exploit improper input validation mechanisms within the web server's file handling routines, allowing unauthorized access to sensitive system files through crafted requests containing directory traversal sequences.
The technical implementation of this vulnerability stems from the server's failure to adequately sanitize user-supplied input parameters that are used to construct file paths. When a remote attacker submits a request containing .. (dot dot) sequences in file path references, the web server processes these traversal indicators without proper validation, effectively allowing access to files outside the intended web root directory. This flaw operates at the application layer and can be exploited through HTTP requests that manipulate file path resolution logic, making it particularly dangerous as it can potentially expose system configuration files, source code, and other sensitive data.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with the capability to access critical system resources that could lead to further exploitation. An attacker could potentially retrieve administrative configuration files, database credentials, or application source code that might reveal additional vulnerabilities within the system. The vulnerability is particularly concerning for web servers that host sensitive applications, as it could enable complete system compromise through the exposure of underlying system information and potential privilege escalation paths.
Security practitioners should implement multiple layers of defense to mitigate this vulnerability, beginning with immediate patching of affected Free Java Web Server installations to version 1.0.1 or later, which contains the necessary input validation fixes. Network segmentation and firewall rules should be implemented to restrict access to web server ports, while web application firewalls can be configured to detect and block directory traversal patterns in incoming requests. Additionally, the principle of least privilege should be enforced by running the web server with minimal required permissions and ensuring that sensitive files are stored outside the web root directory. According to ATT&CK framework category T1213, this vulnerability aligns with the technique of data from information repositories, as it allows adversaries to access stored data through improper access control mechanisms. Regular security audits and input validation testing should be conducted to prevent similar vulnerabilities from emerging in other applications within the organization's infrastructure.