CVE-2002-2186 in JRun
Summary
by MITRE
Macromedia JRun 3.0, 3.1, and 4.0 allow remote attackers to view the source code of .JSP files via Unicode encoded character values in a URL.
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Analysis
by VulDB Data Team • 07/11/2024
The vulnerability identified as CVE-2002-2186 affects Macromedia JRun application servers version 3.0, 3.1, and 4.0, representing a critical security flaw that enables remote attackers to access sensitive source code files through carefully crafted URL requests. This vulnerability specifically targets the web server's handling of Unicode encoded characters within Uniform Resource Locators, creating an avenue for unauthorized information disclosure that could significantly compromise application security. The flaw stems from inadequate input validation and improper character encoding handling within the JRun server's request processing pipeline, allowing malicious actors to exploit the system's failure to properly sanitize Unicode sequences.
The technical implementation of this vulnerability exploits the server's inability to properly interpret and validate Unicode character sequences in URLs, particularly when these sequences correspond to directory traversal or file access patterns. When a remote attacker submits a URL containing Unicode encoded characters that map to special filesystem characters or directory navigation sequences, the vulnerable JRun server fails to properly decode or validate these inputs, resulting in the unintended exposure of .jsp source code files. This represents a classic path traversal vulnerability that leverages encoding obfuscation to bypass security controls. The vulnerability aligns with CWE-22 Path Traversal and CWE-77 Improper Neutralization of Special Elements used in a Command to prevent directory traversal attacks, while also demonstrating characteristics of CWE-116 Improper Encoding or Escaping of Output Data.
The operational impact of this vulnerability extends beyond simple information disclosure, as the exposure of .jsp source code provides attackers with detailed insights into application logic, database connection strings, user authentication mechanisms, and potentially sensitive business logic implementations. Attackers can leverage this information to craft more sophisticated attacks, identify additional vulnerabilities within the application, or develop targeted exploits against other components of the system. The remote nature of the attack means that adversaries do not require physical access or local system credentials to exploit this vulnerability, making it particularly dangerous in production environments where JRun servers may be directly accessible from the internet. This vulnerability can be categorized under ATT&CK technique T1566.001 Initial Access: Phishing with Malicious Attachments, as attackers may use the exposed source code to create more convincing social engineering campaigns or to identify additional attack vectors within the application infrastructure.
Organizations utilizing affected JRun versions should immediately implement mitigations including upgrading to patched versions of the software, implementing proper input validation for URL parameters, and configuring web application firewalls to detect and block Unicode encoded character sequences in URLs. The vulnerability demonstrates the importance of proper character encoding handling and input validation in web applications, particularly when dealing with internationalized content or special character sequences. Security teams should also conduct comprehensive code reviews to identify similar encoding issues in other applications and web servers within their infrastructure, as this vulnerability type remains prevalent in many legacy systems. Additionally, implementing proper access controls and file permissions can help limit the impact of such vulnerabilities even when they are present in the system.
The vulnerability serves as a reminder of the critical importance of proper input validation and encoding handling in web applications, particularly in enterprise environments where legacy systems may contain unpatched security flaws. The exploitation of this vulnerability highlights the need for comprehensive security testing including penetration testing and vulnerability assessments to identify similar issues within application code. Organizations should also consider implementing automated monitoring solutions that can detect anomalous URL patterns or suspicious character sequences that may indicate attempts to exploit similar vulnerabilities. The widespread nature of this issue in older web application servers underscores the importance of maintaining current security patches and implementing proper security governance practices to prevent exploitation of known vulnerabilities.