CVE-2007-2157 in Zomplog
Summary
by MITRE
Directory traversal vulnerability in upload/force_download.php in Zomplog 3.8 allows remote attackers to read arbitrary files via a .. (dot dot) in the file parameter.
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Analysis
by VulDB Data Team • 09/07/2024
The vulnerability identified as CVE-2007-2157 represents a critical directory traversal flaw within the Zomplog 3.8 blogging platform, specifically affecting the upload/force_download.php script. This weakness enables remote attackers to access arbitrary files on the server by manipulating the file parameter through directory traversal sequences using the .. (dot dot) notation. The vulnerability stems from inadequate input validation and sanitization within the file handling mechanism, allowing malicious users to bypass normal file access controls and retrieve sensitive information from the server's file system.
The technical implementation of this vulnerability occurs when the application processes user-supplied input without proper validation, specifically in the force_download.php script that handles file download operations. When an attacker supplies a file parameter containing directory traversal sequences such as ../../etc/passwd, the application fails to properly sanitize this input, allowing the traversal to occur. This flaw maps directly to CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal. The vulnerability operates at the application layer and requires no special privileges to exploit, making it particularly dangerous as it can be leveraged by any remote attacker with access to the affected web application.
The operational impact of this vulnerability extends beyond simple information disclosure, as it can potentially expose sensitive system files, configuration data, and user information. Attackers can leverage this weakness to access database configuration files, application source code, server configuration files, and potentially user credentials stored in accessible locations. The implications are significant for organizations relying on Zomplog 3.8, as successful exploitation could lead to complete system compromise, data breaches, and unauthorized access to sensitive corporate or personal information. This vulnerability aligns with ATT&CK technique T1213.002, which covers data from information repositories, as attackers can systematically extract valuable data from the compromised system through this traversal mechanism.
Mitigation strategies for CVE-2007-2157 require immediate implementation of proper input validation and sanitization measures within the affected application. Organizations should implement strict parameter validation that rejects or removes directory traversal sequences from user input before processing. The recommended approach includes implementing a whitelist-based validation system that only accepts known safe file paths and extensions, along with proper access control mechanisms that prevent traversal beyond designated directories. Additionally, applying the latest security patches from Zomplog developers, implementing web application firewalls with signature-based detection capabilities, and conducting regular security assessments are essential defensive measures. The vulnerability also highlights the importance of following secure coding practices as outlined in OWASP Top Ten and NIST guidelines for preventing path traversal attacks, emphasizing the need for comprehensive input validation and proper file access controls in all web applications handling user-supplied file operations.