CVE-2006-2902 in Particle Links
Summary
by MITRE
Directory traversal vulnerability in Particle Links 1.2.2 might allow remote attackers to access arbitrary files via ".." sequences in an HTTP request. NOTE: it is not clear whether this issue is legitimate, as the original researcher seems unsure.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 09/17/2017
The vulnerability identified as CVE-2006-2902 represents a directory traversal flaw within the Particle Links 1.2.2 web application, classified under the Common Weakness Enumeration category CWE-22. This weakness specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The vulnerability manifests when the application fails to properly validate or sanitize user input that contains directory path sequences such as ".." or "../", which are designed to navigate up directory levels in file systems. When an attacker crafts HTTP requests containing these sequences, the vulnerable application may interpret them as legitimate navigation commands, allowing unauthorized access to files outside the intended web root directory.
The technical exploitation of this vulnerability occurs through the manipulation of file path parameters in HTTP requests, where the application processes user-supplied input without adequate sanitization or validation. This flaw enables attackers to traverse the file system hierarchy by including sequences like "../" in their requests, potentially accessing sensitive files such as configuration files, database files, system files, or other restricted resources that should not be accessible through the web interface. The vulnerability is particularly concerning because it operates at the application level, where the web server or application framework fails to properly restrict file access based on user input. The uncertainty surrounding the legitimacy of this issue, as noted in the original description, suggests potential ambiguities in the vulnerability's reproduction or the specific conditions under which it manifests, possibly indicating either incomplete testing or unclear exploitation paths.
The operational impact of this vulnerability extends beyond simple information disclosure, as successful exploitation could lead to complete system compromise through access to critical system files, configuration data, or database credentials. Attackers might leverage this vulnerability to obtain sensitive information that could facilitate further attacks, including privilege escalation or lateral movement within the network. The vulnerability's remote nature means that attackers do not require physical access to the system, making it particularly dangerous in web-facing environments where the application is exposed to untrusted users. This type of vulnerability aligns with ATT&CK technique T1083 (File and Directory Discovery) and T1566 (Phishing with Malicious Attachment) as attackers may use directory traversal to discover and extract sensitive files that could then be used for social engineering or additional attack vectors. Organizations running Particle Links 1.2.2 or similar vulnerable applications face significant risk of unauthorized data access, potential data breaches, and system compromise if this vulnerability remains unpatched.
Mitigation strategies for CVE-2006-2902 should focus on implementing proper input validation and sanitization mechanisms that prevent directory traversal attempts. The most effective approach involves implementing a whitelist-based validation system that only allows specific, expected file paths while rejecting any input containing directory traversal sequences. Additionally, applications should employ secure coding practices that include proper path normalization, use of secure file access APIs, and implementation of proper access controls that restrict file system access based on user privileges. Organizations should also consider implementing web application firewalls that can detect and block suspicious directory traversal patterns in HTTP requests. The vulnerability highlights the importance of regular security assessments and vulnerability scanning to identify similar weaknesses in legacy applications, as the Particle Links 1.2.2 version appears to be outdated and potentially affected by multiple security issues beyond this single vulnerability. Patch management procedures should prioritize updating or replacing vulnerable applications with secure versions that have addressed these fundamental security flaws.