CVE-2002-1541 in Badblue
Summary
by MITRE
BadBlue 1.7 allows remote attackers to bypass password protections for directories and files via an HTTP request containing an extra / (slash).
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Analysis
by VulDB Data Team • 09/05/2025
The vulnerability identified as CVE-2002-1541 affects BadBlue 1.7 web server software and represents a classic path traversal flaw that enables unauthorized access to protected resources. This issue arises from insufficient input validation within the HTTP request processing mechanism, specifically when handling directory paths that contain additional forward slashes. The vulnerability operates at the application layer and demonstrates a fundamental weakness in access control implementation. According to CWE-22, this corresponds to Improper Limitation of a Pathname to a Restricted Directory, which is a well-documented category of security flaws that have plagued web applications for decades. The flaw allows attackers to manipulate HTTP requests by appending extra slashes to directory paths, effectively circumventing the authentication and authorization mechanisms that should protect sensitive files and directories.
The technical exploitation of this vulnerability occurs when a malicious actor crafts an HTTP request that includes multiple consecutive forward slashes within the requested path. This seemingly innocuous modification can cause the web server to interpret the path differently than intended, potentially allowing access to files and directories that should remain protected behind authentication barriers. The vulnerability is particularly dangerous because it operates at the protocol level where the web server processes requests and enforces access controls. Attackers can leverage this flaw to access configuration files, source code, user data, and other sensitive resources that are normally protected by password authentication. The vulnerability's impact extends beyond simple file access as it can potentially enable further exploitation such as arbitrary code execution or data exfiltration.
Operationally, this vulnerability presents significant risks to organizations deploying BadBlue 1.7 servers, particularly those handling sensitive information or operating in regulated environments. The remote nature of the attack means that adversaries can exploit this flaw from anywhere on the internet without requiring physical access to the system or local network credentials. The vulnerability's exploitation does not require sophisticated techniques or specialized tools, making it accessible to a broad range of threat actors including script kiddies and automated attack bots. Organizations using this software may experience unauthorized access to critical data, potential compliance violations, and reputational damage. The vulnerability also creates opportunities for attackers to establish persistent access or use the compromised server as a launch point for further attacks against internal networks, aligning with ATT&CK technique T1190 for Exploit Public-Facing Application and T1078 for Valid Accounts.
Mitigation strategies for CVE-2002-1541 should focus on immediate software updates and configuration hardening measures. Organizations should prioritize upgrading to patched versions of BadBlue or migrating to more modern web server solutions that properly handle path validation. Network-level protections such as web application firewalls and intrusion prevention systems can provide additional layers of defense against exploitation attempts. Input validation should be implemented at multiple levels including application code, proxy servers, and network security devices to prevent malformed requests from reaching the vulnerable software. Regular security assessments and penetration testing should be conducted to identify similar path traversal vulnerabilities in other applications and systems. Access controls should be reviewed and strengthened with proper directory permissions and authentication mechanisms that do not rely solely on URL-based protection. The vulnerability also highlights the importance of implementing proper security configurations and conducting regular vulnerability assessments to prevent similar issues in other software components within the organization's infrastructure.