CVE-2006-5617 in Thepeak File Upload Manager
Summary
by MITRE
Directory traversal vulnerability in index.php in Thepeak File Upload Manager 1.3 allows remote attackers to read or download arbitrary files via a base64-encoded file path containing a .. (dot dot) sequence in the file parameter.
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Analysis
by VulDB Data Team • 04/25/2026
The vulnerability identified as CVE-2006-5617 represents a critical directory traversal flaw within Thepeak File Upload Manager version 1.3, specifically affecting the index.php component. This issue stems from inadequate input validation mechanisms that fail to properly sanitize user-supplied data before processing file operations. The vulnerability manifests when the application accepts a base64-encoded file path through the file parameter, which can contain malicious .. (dot dot) sequences that manipulate the intended file access path. Such directory traversal vulnerabilities fall under the CWE-22 classification, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks.
The technical exploitation of this vulnerability occurs when remote attackers craft malicious requests containing base64-encoded paths with directory traversal sequences that bypass normal file access controls. The application processes these requests without sufficient validation, allowing attackers to navigate beyond the intended directory boundaries and access arbitrary files on the server filesystem. This flaw enables attackers to read sensitive configuration files, source code, database credentials, or other confidential information that should remain protected within the application's restricted access zones. The vulnerability's impact is amplified by the base64 encoding mechanism, which can obfuscate the malicious intent while maintaining the directory traversal functionality.
Operationally, this vulnerability poses significant risks to organizations deploying Thepeak File Upload Manager 1.3, as it provides attackers with unauthorized access to potentially sensitive data stored on the server. The remote nature of the exploit means that attackers do not require physical access or local system privileges to leverage this vulnerability, making it particularly dangerous in web-facing environments. Successful exploitation can lead to data breaches, system compromise, and potential lateral movement within network infrastructures. The vulnerability aligns with several ATT&CK techniques including T1083 (File and Directory Discovery) and T1566 (Phishing), as attackers can use this flaw to discover and extract sensitive information from compromised systems.
Mitigation strategies for CVE-2006-5617 should prioritize immediate patching of Thepeak File Upload Manager to version 1.4 or later, which contains the necessary security fixes. Organizations should implement robust input validation mechanisms that reject or sanitize any path traversal sequences regardless of encoding method. The application should enforce strict file access controls using whitelisting approaches where only explicitly allowed file paths are processed. Additionally, implementing proper access controls and privilege separation can limit the damage if exploitation occurs. Network segmentation and intrusion detection systems can help monitor for suspicious file access patterns. Security professionals should also consider implementing web application firewalls that can detect and block malicious directory traversal attempts, particularly those involving base64-encoded payloads. The vulnerability demonstrates the importance of defense-in-depth strategies and proper input sanitization practices that align with industry standards such as OWASP Top Ten and NIST cybersecurity guidelines for preventing common web application vulnerabilities.