CVE-2006-2098 in Php Thumbnail Autoindex
Summary
by MITRE
PHP remote file inclusion vulnerability in Thumbnail AutoIndex before 2.0 allows remote attackers to execute arbitrary PHP code via (1) README.html or (2) HEADER.html.
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Analysis
by VulDB Data Team • 09/09/2017
The vulnerability described in CVE-2006-2098 represents a critical remote file inclusion flaw in the Thumbnail AutoIndex application version 1.9 and earlier. This vulnerability falls under the category of insecure direct object references and improper input validation, specifically manifesting as a remote code execution vector that enables attackers to inject and execute arbitrary PHP code on the target system. The flaw exists in the application's handling of user-supplied input within the context of HTML file inclusion mechanisms, creating a pathway for malicious actors to extend their attack surface beyond the intended application boundaries.
The technical implementation of this vulnerability stems from the application's failure to properly sanitize or validate input parameters that control which HTML files are included during the thumbnail generation process. When the application processes requests involving README.html or HEADER.html files, it directly incorporates user-provided data into file inclusion operations without adequate validation. This allows an attacker to supply malicious file paths or URLs that point to remote PHP scripts hosted on external servers, effectively bypassing local file access restrictions and enabling arbitrary code execution. The vulnerability operates at the application layer, specifically within the file inclusion functions that process user input, making it particularly dangerous as it can be exploited through web-based interfaces without requiring local system access.
The operational impact of this vulnerability extends far beyond simple code execution, as it provides attackers with complete control over the affected system. Successful exploitation allows adversaries to execute arbitrary commands, potentially leading to full system compromise, data exfiltration, or the establishment of persistent backdoors. The vulnerability affects the core functionality of Thumbnail AutoIndex, which is designed to generate web-based thumbnail galleries from image collections, but the flaw transforms this legitimate function into a vector for malicious activity. Attackers can leverage this vulnerability to deploy web shells, modify existing files, create new malicious files, or even escalate privileges within the system's execution context, depending on the permissions granted to the web application process.
Mitigation strategies for CVE-2006-2098 should focus on immediate application patching, as the most effective solution involves upgrading to Thumbnail AutoIndex version 2.0 or later where the vulnerability has been addressed. Organizations should also implement input validation measures that sanitize all user-supplied data before processing, particularly within file inclusion contexts. Network-level protections such as web application firewalls can help detect and block malicious requests attempting to exploit this vulnerability, though they should not be considered a replacement for proper code-level fixes. Additionally, system administrators should review and restrict file inclusion operations within the application, disable remote file inclusion capabilities where possible, and ensure that the web application operates with minimal required privileges to limit potential damage from successful exploitation attempts. This vulnerability aligns with CWE-98 and CWE-22 categories, representing improper neutralization of special elements and improper limitation of a pathname to a restricted directory respectively, and maps to ATT&CK techniques involving command and control communications and remote code execution.