CVE-2006-7035 in Super Link Exchange Script
Summary
by MITRE
Directory traversal vulnerability in make_thumbnail.php in Super Link Exchange Script 1.0 allows remote attackers to read arbitrary files via ".." sequences in the imgpath parameter.
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Analysis
by VulDB Data Team • 10/11/2017
The vulnerability identified as CVE-2006-7035 represents a classic directory traversal flaw within the Super Link Exchange Script version 1.0, specifically affecting the make_thumbnail.php component. This issue arises from inadequate input validation and sanitization mechanisms that fail to properly restrict user-supplied data before processing file system operations. The vulnerability is particularly concerning as it enables remote attackers to access arbitrary files on the server by manipulating the imgpath parameter through directory traversal sequences using double dots "..". This type of vulnerability falls under the CWE-22 category, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks.
The technical implementation of this vulnerability occurs when the make_thumbnail.php script accepts user input through the imgpath parameter without sufficient validation to prevent directory traversal sequences. When an attacker submits a malicious payload containing ".." sequences, the script processes these inputs directly without proper sanitization, allowing the attacker to navigate beyond the intended directory boundaries. The vulnerability essentially permits access to files outside the designated thumbnail directory, potentially exposing sensitive system files, configuration data, or other restricted resources that should remain inaccessible to remote users. This flaw operates at the application layer and leverages the fundamental trust placed in user inputs without proper verification of their legitimacy.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with the capability to access critical system resources that could lead to further compromise. An attacker could potentially retrieve configuration files containing database credentials, application source code, or other sensitive data that could be used for additional attacks. The vulnerability affects the confidentiality aspect of the CIA triad by allowing unauthorized access to files that should remain protected. In the context of the MITRE ATT&CK framework, this vulnerability maps to the T1083 technique for discovering files and directories, and could potentially lead to T1566 for initial access through exploitation of web applications. The remote nature of this attack means that no local system access is required, making it particularly dangerous for web applications exposed to the internet.
Mitigation strategies for CVE-2006-7035 should focus on implementing proper input validation and sanitization mechanisms to prevent directory traversal attempts. The most effective approach involves implementing a whitelist-based validation system that only accepts predetermined, safe file paths and rejects any input containing directory traversal sequences. Additionally, the application should employ proper path normalization techniques and ensure that all user-supplied paths are validated against a strict set of allowed directories. Implementing the principle of least privilege for web application processes can also limit the damage if an attacker successfully exploits the vulnerability. Organizations should also consider implementing web application firewalls and intrusion detection systems to monitor for suspicious directory traversal attempts. The remediation process requires thorough code review to identify all similar vulnerabilities within the application and ensure that proper input validation is consistently applied across all file handling operations. Regular security testing and vulnerability assessments should be conducted to identify and address similar weaknesses in the application architecture.