CVE-2017-16190 in dcdcdcdcdc
Summary
by MITRE
dcdcdcdcdc is a static file server. dcdcdcdcdc 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 • 02/16/2020
The vulnerability identified as CVE-2017-16190 affects dcdcdcdcdc, a static file server implementation that suffers from a critical directory traversal flaw. This issue allows attackers to access arbitrary files on the underlying filesystem by manipulating URL parameters through the strategic insertion of "../" sequences. The vulnerability represents a fundamental security weakness in how the server processes file paths and handles user input, creating an opportunity for unauthorized data access and potential system compromise.
This directory traversal vulnerability stems from inadequate input validation and path sanitization within the static file server implementation. When users submit URLs containing directory traversal sequences, the server fails to properly validate or sanitize these inputs before resolving file paths. The flaw enables attackers to navigate beyond the intended document root directory and access sensitive system files, configuration data, or other restricted resources that should remain protected from external access. This represents a classic path traversal vulnerability categorized under CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory.
The operational impact of this vulnerability is substantial as it provides attackers with unrestricted access to the filesystem where the static file server operates. An attacker could potentially extract sensitive information including configuration files, user data, system credentials, or application source code that might reveal additional vulnerabilities. The severity of this issue increases when the server runs with elevated privileges or when sensitive data is stored within the accessible directories. This vulnerability aligns with ATT&CK technique T1083, which covers discovering file and directory permissions on compromised systems, and T1566, which encompasses the initial access phase through exploitation of vulnerable applications.
Mitigation strategies for this vulnerability should focus on implementing robust input validation and path sanitization mechanisms. The server implementation must properly validate all URL parameters to prevent directory traversal sequences from being processed. Organizations should enforce strict path normalization and ensure that file access operations are constrained to predefined directories without allowing upward directory traversal. Additionally, implementing proper access controls, running the server with minimal required privileges, and regularly updating the static file server software can significantly reduce the risk of exploitation. Network segmentation and intrusion detection systems can provide additional layers of protection against unauthorized access attempts targeting this specific vulnerability.