CVE-2007-0637 in Galeria Zdjec
Summary
by MITRE
Directory traversal vulnerability in zd_numer.php in Galeria Zdjec 3.0 and earlier allows remote attackers to include and execute arbitrary local files via a .. (dot dot) in the galeria parameter, as demonstrated by injecting PHP sequences into an Apache HTTP Server log file, which is then included by zd_numer.php.
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Analysis
by VulDB Data Team • 08/20/2024
The vulnerability identified as CVE-2007-0637 represents a critical directory traversal flaw affecting Galeria Zdjec version 3.0 and earlier implementations. This security weakness resides within the zd_numer.php script which processes user input through the galeria parameter without adequate validation or sanitization. The vulnerability stems from the application's failure to properly filter or restrict directory path traversal sequences, allowing malicious actors to navigate beyond the intended directory structure and access arbitrary local files on the server filesystem.
This directory traversal vulnerability operates through a classic dot-dot-slash attack vector where attackers can manipulate the galeria parameter to include parent directory references using .. sequences. The exploitation technique demonstrates particular sophistication as it leverages Apache HTTP Server log files as attack vectors, exploiting the fact that these log files often contain user-supplied data that gets processed by the vulnerable application. When PHP code sequences are injected into the Apache log files through malicious user input, the zd_numer.php script can subsequently include and execute this malicious code, creating a remote code execution scenario.
The operational impact of this vulnerability extends beyond simple file access, as it enables full remote code execution capabilities. Attackers can inject PHP payloads into log files through various means such as malicious web requests or other input vectors that get logged by the Apache server. Once the zd_numer.php script processes these log files through the vulnerable galeria parameter, the injected PHP code executes with the privileges of the web server process, potentially allowing attackers to gain complete control over the affected system. This vulnerability directly maps to CWE-22 Directory Traversal and aligns with ATT&CK technique T1059.007 for Command and Scripting Interpreter, specifically PHP.
Mitigation strategies for this vulnerability require immediate patching of the Galeria Zdjec application to version 3.1 or later, which contains the necessary input validation fixes. System administrators should implement comprehensive input validation and sanitization measures, particularly for all user-supplied parameters that are used to construct file paths. The application should employ strict path validation that rejects any input containing directory traversal sequences, and implement proper access controls that prevent file inclusion from arbitrary locations. Additionally, log files should be properly secured and sanitized to prevent malicious code injection, while implementing principle of least privilege for web server processes to limit potential damage from successful exploitation. Organizations should also consider implementing web application firewalls and regular security audits to detect and prevent similar vulnerabilities in other applications.