CVE-2006-0971 in DirectContact
Summary
by MITRE
Directory traversal vulnerability in Lionel Reyero DirectContact 0.3b allows remote attackers to read arbitrary files via a .. (dot dot) in the URL.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 07/20/2018
The vulnerability identified as CVE-2006-0971 represents a classic directory traversal flaw affecting Lionel Reyero DirectContact version 0.3b. This type of vulnerability falls under the CWE-22 category known as "Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')", which is one of the most prevalent and dangerous web application security issues. The flaw stems from inadequate input validation within the application's URL processing mechanism, specifically failing to properly sanitize or validate the presence of directory traversal sequences such as ".." or "%2e%2e" in file paths.
The technical exploitation of this vulnerability occurs when remote attackers manipulate URL parameters to include directory traversal sequences that allow them to navigate beyond the intended directory structure and access files that should remain restricted. In the context of DirectContact 0.3b, when a user supplies a URL containing dot dot sequences, the application processes these paths without proper sanitization, enabling unauthorized access to arbitrary files on the server filesystem. This vulnerability specifically affects web applications that dynamically construct file paths based on user input without implementing proper access controls or path validation mechanisms.
The operational impact of this vulnerability is significant and multifaceted, potentially exposing sensitive system information including configuration files, database credentials, source code, and other confidential data. Attackers could leverage this weakness to gain unauthorized access to critical system components, leading to potential system compromise, data theft, or further exploitation of the affected system. The vulnerability creates an attack surface that allows for reconnaissance activities and can serve as a stepping stone for more sophisticated attacks within the network infrastructure. According to ATT&CK framework, this vulnerability maps to T1083 (File and Directory Discovery) and T1566 (Phishing with Malicious Attachment) as attackers can use the information gathered through directory traversal to craft more targeted attacks.
Mitigation strategies for this vulnerability involve implementing robust input validation and sanitization mechanisms that properly filter or reject directory traversal sequences in all user-supplied input. The most effective approach includes implementing a whitelist-based validation system that only accepts known good input patterns while rejecting any potentially malicious sequences. Additionally, applications should employ proper access controls and file system permissions to ensure that even if traversal attacks succeed, they cannot access sensitive files beyond the intended application scope. Security measures should also include regular code reviews and input validation testing to identify and remediate similar vulnerabilities in other parts of the application. Organizations should also consider implementing web application firewalls and security monitoring solutions that can detect and block suspicious traversal attempts in real-time. The vulnerability highlights the critical importance of following secure coding practices and implementing defense-in-depth strategies to protect against path traversal attacks that have been a persistent threat in web application security for over a decade.