CVE-2006-6556 in EyeOS
Summary
by MITRE
The eyeHome function in apps/eyeHome.eyeapp/aplic.php in EyeOS before 0.9.3-3 allows remote attackers to upload and execute arbitrary code via dangerous file extensions that are not all lowercase, which bypasses a cleansing operation.
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Analysis
by VulDB Data Team • 08/10/2018
The vulnerability identified as CVE-2006-6556 resides within the eyeHome function of EyeOS version 0.9.3-2 and earlier, representing a critical security flaw in the web-based operating system designed for collaborative computing environments. This vulnerability specifically targets the file upload validation mechanism within the aplic.php script, which serves as a core component of the EyeOS application framework. The flaw manifests when the system processes file uploads through the eyeHome functionality, creating an avenue for malicious actors to bypass security controls intended to prevent execution of unauthorized code.
The technical implementation of this vulnerability stems from an insufficient file extension validation mechanism that fails to properly sanitize file names containing uppercase characters. The cleansing operation in aplic.php is designed to filter out dangerous file extensions such as .php, .asp, or .jsp, but it only examines file extensions when they appear in lowercase format. This oversight allows attackers to craft filenames with mixed case extensions where uppercase letters are strategically placed to evade detection, such as .PhP or .AsP, which the system's validation logic fails to recognize as malicious. The vulnerability operates under CWE-434, which specifically addresses the improper restriction of uploads of executable code, and demonstrates a classic case of insufficient input validation and sanitization.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it enables remote code execution on the target system with the privileges of the web server process. Attackers can leverage this flaw to upload malicious files such as web shells, backdoors, or other executable payloads that can subsequently be executed through the web interface. This creates a persistent threat vector that can be exploited to establish unauthorized access, conduct data exfiltration, or deploy additional malicious software within the compromised environment. The vulnerability particularly affects collaborative computing environments where multiple users may have access to file sharing and upload functionality, making it a significant concern for organizations relying on EyeOS for document management and collaboration services.
Mitigation strategies for this vulnerability require immediate implementation of comprehensive file validation measures that address case sensitivity issues in file extension checking. Organizations should implement strict file type validation that converts all file extensions to lowercase before processing, ensuring that all variations of potentially dangerous extensions are properly identified and rejected. The recommended approach aligns with ATT&CK technique T1190, which focuses on exploiting vulnerabilities in web applications, and emphasizes the importance of proper input validation and sanitization. Additionally, system administrators should consider implementing additional security controls such as file content inspection, mandatory file type whitelisting, and regular security audits of web application components to prevent similar vulnerabilities from persisting in the environment. The vulnerability serves as a critical reminder of the importance of thorough testing and validation of security controls, particularly in web applications where user-supplied data can be exploited to gain unauthorized system access.