CVE-2006-2281 in X-Poll
Summary
by MITRE
X-Scripts X-Poll (xpoll) 2.30 allows remote attackers to execute arbitrary PHP code by using admin/images/add.php to upload a PHP file, then access it.
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Analysis
by VulDB Data Team • 07/26/2018
The vulnerability identified as CVE-2006-2281 affects X-Scripts X-Poll version 2.30, a web-based polling application that suffers from a critical file upload vulnerability leading to remote code execution. This flaw resides in the administrative interface where the application fails to properly validate file types during the upload process, specifically within the admin/images/add.php script. The vulnerability represents a classic insecure file upload vulnerability that allows attackers to bypass security measures and execute malicious code on the target server. The flaw is particularly dangerous because it provides direct access to the server's file system through the administrative upload functionality, which is typically restricted to authorized users only.
The technical implementation of this vulnerability stems from inadequate input validation and sanitization within the file upload mechanism. When administrators attempt to upload images through the add.php script, the application does not perform proper checks to verify that uploaded files conform to expected image formats. This weakness allows attackers to upload PHP files with malicious code embedded within them, effectively creating a backdoor on the server. The vulnerability operates under CWE-434, which classifies insecure file upload as a critical weakness that enables attackers to upload and execute arbitrary code. The flaw is particularly concerning as it does not require authentication to exploit, making it a significant risk for any system where the administrative interface remains accessible.
The operational impact of this vulnerability extends far beyond simple code execution, as it provides attackers with complete control over the affected server. Once a malicious PHP file is successfully uploaded and executed, attackers can perform a wide range of malicious activities including data exfiltration, server compromise, and further network infiltration. The vulnerability directly maps to several ATT&CK techniques including T1190 for exploit for lateral movement, T1059 for command and scripting interpreter, and T1566 for credential harvesting. The attack chain begins with the initial file upload, followed by execution of the malicious payload, and potentially escalation to full system compromise. Organizations running this vulnerable software face significant risk of data breaches, service disruption, and potential regulatory violations.
Mitigation strategies for CVE-2006-2281 should focus on immediate patching of the vulnerable application to address the insecure file upload mechanism. System administrators must implement proper file type validation and sanitization measures that reject non-image file extensions and perform content-based verification of uploaded files. The recommended approach includes implementing a whitelist of allowed file extensions, validating file content using MIME type checking, and storing uploaded files outside the web root directory to prevent direct execution. Organizations should also consider implementing web application firewalls that can detect and block suspicious file upload attempts, along with regular security audits to identify similar vulnerabilities in other applications. Additionally, network segmentation and access control measures should be implemented to limit administrative access to only trusted users and systems, reducing the attack surface for such vulnerabilities.