CVE-1999-0758 in Netscape
Summary
by MITRE
Netscape Enterprise 3.5.1 and FastTrack 3.01 servers allow a remote attacker to view source code to scripts by appending a %20 to the script s URL.
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Analysis
by VulDB Data Team • 05/15/2019
This vulnerability exists in Netscape Enterprise Server version 3.5.1 and FastTrack Server version 3.01, representing a critical information disclosure flaw that allows remote attackers to access sensitive source code files. The vulnerability stems from improper handling of URL decoding processes where the web server fails to properly sanitize input parameters, specifically when a space character encoded as %20 is appended to script URLs. This behavior violates fundamental security principles of input validation and access control, creating an unauthorized information disclosure scenario.
The technical implementation of this flaw occurs at the server-side URL parsing level where the web server's internal processing does not adequately distinguish between legitimate user requests and malicious attempts to bypass access controls. When a user appends %20 to a script URL, the server's request handling mechanism incorrectly processes this encoded space character, allowing the system to serve the raw source code of the script rather than executing it as intended. This represents a classic case of improper input validation and inadequate access control mechanisms, which aligns with CWE-20 - Improper Input Validation and CWE-264 - Permissions, Privileges, and Access Controls.
The operational impact of this vulnerability is severe as it exposes sensitive application source code, including potentially confidential business logic, database connection strings, authentication mechanisms, and other proprietary code elements. Attackers can leverage this vulnerability to gain comprehensive understanding of the application architecture, identify additional attack vectors, and develop more sophisticated exploitation techniques. The exposure of source code significantly increases the attack surface and provides adversaries with valuable intelligence for further compromise attempts, making this a critical security concern for any organization relying on these server implementations.
Organizations should immediately implement mitigations including disabling unnecessary file access capabilities, implementing proper URL validation and sanitization, and ensuring that all web server configurations properly handle encoded characters. The recommended approach involves configuring the server to reject or properly decode URL parameters that could lead to directory traversal or file access attempts. Additionally, implementing web application firewalls and input validation rules that specifically address encoded space characters can prevent exploitation of this vulnerability. This issue demonstrates the importance of proper security configuration management and the critical need for regular security assessments to identify and remediate similar flaws in web server implementations. The vulnerability serves as a reminder of the fundamental security principle that all user-supplied input must be properly validated and sanitized before processing, as outlined in various security frameworks including the OWASP Top Ten and NIST cybersecurity guidelines.