CVE-2002-0100 in Server
Summary
by MITRE
AOL AOLserver 3.4.2 Win32 allows remote attackers to bypass authentication and read password-protected files via a URL that directly references the file.
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Analysis
by VulDB Data Team • 05/18/2019
The vulnerability identified as CVE-2002-0100 affects AOLserver 3.4.2 on Windows platforms and represents a critical authentication bypass flaw that enables remote attackers to access password-protected content without proper credentials. This issue stems from improper handling of file access requests within the web server implementation, specifically when processing URLs that directly reference protected resources. The vulnerability allows malicious actors to circumvent the authentication mechanisms that should normally prevent unauthorized access to sensitive files, effectively undermining the security posture of systems relying on this server software.
The technical root cause of this vulnerability lies in the server's inadequate validation of access control mechanisms when processing direct file references in URLs. When a user attempts to access a password-protected file through a direct URL path, the server fails to properly verify authentication credentials before granting access. This flaw operates at the application layer and can be exploited through simple HTTP requests that bypass normal authentication flows. The vulnerability is classified under CWE-284 which addresses improper access control issues, specifically focusing on inadequate access control mechanisms that allow unauthorized access to protected resources. The flaw demonstrates a classic path traversal and access control bypass pattern that has been documented in numerous security advisories over the years.
The operational impact of this vulnerability is significant as it allows remote attackers to gain unauthorized access to sensitive information that should be protected by authentication mechanisms. Attackers can directly access files that contain confidential data, configuration information, or other sensitive resources that are typically protected by password authentication. This can lead to data breaches, system compromise, and potential lateral movement within networks where the vulnerable server is deployed. The vulnerability is particularly dangerous because it does not require any special privileges or complex exploitation techniques, making it easily accessible to attackers with basic web exploitation knowledge. According to ATT&CK framework, this vulnerability maps to T1078 which covers valid accounts and T1566 which covers credential harvesting, as it allows unauthorized access to protected resources through bypassed authentication mechanisms.
Mitigation strategies for this vulnerability should include immediate patching of the AOLserver software to the latest available version that addresses the authentication bypass flaw. Organizations should also implement network segmentation and access control measures to limit exposure of vulnerable servers to untrusted networks. Additional defensive measures include implementing proper input validation for URL requests, configuring web server access controls, and monitoring for suspicious access patterns that may indicate exploitation attempts. Security administrators should also consider implementing web application firewalls to detect and block malicious requests attempting to bypass authentication mechanisms. Regular security assessments and vulnerability scanning should be conducted to identify similar issues in other web server implementations. The vulnerability highlights the critical importance of proper authentication implementation and access control validation in web applications, emphasizing the need for comprehensive security testing during development and deployment phases to prevent such issues from reaching production environments.