CVE-2017-16036 in badjs-sourcemap-server
Summary
by MITRE
`badjs-sourcemap-server` recieves files sent by `badjs-sourcemap`. `badjs-sourcemap-server` is vulnerable to a directory traversal issue, giving an attacker access to the filesystem by placing "../" in the url.
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Analysis
by VulDB Data Team • 02/14/2020
The vulnerability identified as CVE-2017-16036 affects the badjs-sourcemap-server component within a broader error tracking and debugging system. This server component receives and processes source map files that are typically generated by frontend applications to map minified code back to its original source. The system architecture relies on the proper handling of file paths and URL parsing to ensure secure access to debugging information. When an attacker manipulates URL parameters by injecting directory traversal sequences, they can bypass intended access controls and gain unauthorized access to the underlying filesystem.
The technical flaw manifests as a directory traversal vulnerability that directly relates to CWE-22, which describes improper limitation of a pathname to a restricted directory. The vulnerability occurs because the badjs-sourcemap-server fails to properly sanitize or validate URL parameters that contain file path references. When the server processes requests containing "../" sequences in the URL, it does not adequately filter these components, allowing attackers to navigate outside the intended directory structure. This weakness stems from insufficient input validation and path normalization within the server's file access routines.
The operational impact of this vulnerability is significant as it provides attackers with arbitrary file system access to the server hosting the badjs-sourcemap-server. An attacker could potentially access sensitive configuration files, source code repositories, application data, or other system resources that should remain protected. The vulnerability enables a wide range of malicious activities including data exfiltration, system reconnaissance, and potential privilege escalation. Attackers might also exploit this weakness to upload malicious files or modify existing system components, leading to complete system compromise. This type of vulnerability falls under ATT&CK technique T1083, which covers file and directory discovery, and can be leveraged for broader lateral movement within affected networks.
Mitigation strategies should focus on implementing proper input validation and sanitization for all URL parameters that reference file paths. The server implementation must normalize and validate all incoming paths to prevent directory traversal attempts, typically through the use of whitelisting mechanisms or strict path validation routines. Additionally, the system should operate with minimal necessary privileges and implement proper access controls to limit the damage even if traversal attempts succeed. Security updates and patches should be applied promptly, and the system architecture should consider implementing additional layers of protection such as web application firewalls and regular security audits to detect and prevent similar vulnerabilities in the future.