CVE-2008-6920 in phpEmployment
Summary
by MITRE
Unrestricted file upload vulnerability in auth.php in phpEmployment 1.8 allows remote attackers to execute arbitrary code by uploading a file with an executable extension during a regnew action, then accessing it via a direct request to the file in photoes/.
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Analysis
by VulDB Data Team • 11/20/2024
The vulnerability identified as CVE-2008-6920 represents a critical unrestricted file upload flaw within the phpEmployment 1.8 authentication component. This issue exists in the auth.php script where the application fails to properly validate file extensions during the registration process, specifically when handling the regnew action. The vulnerability stems from inadequate input sanitization and validation mechanisms that permit attackers to bypass security controls designed to prevent execution of malicious code through file uploads.
The technical implementation of this vulnerability occurs during the photoes/ directory file handling process where uploaded files are stored without proper extension verification. Attackers can exploit this weakness by uploading malicious files with executable extensions such as .php, .asp, or .jsp directly through the registration workflow. Once uploaded, these files become accessible via direct HTTP requests to the photoes/ directory, enabling remote code execution on the target server. This represents a classic case of insecure file upload handling that violates fundamental security principles outlined in the OWASP Top Ten and CWE-434.
From an operational perspective, this vulnerability creates a severe attack surface that allows remote attackers to gain full control over the affected server. The impact extends beyond simple code execution to include potential data breaches, system compromise, and lateral movement within network environments. The vulnerability can be exploited without authentication requirements, making it particularly dangerous as it allows any remote user to potentially establish a persistent backdoor or execute arbitrary commands on the target system. This weakness directly aligns with ATT&CK technique T1505.003 for Server Software Component and T1059 for Command and Scripting Interpreter.
The exploitation process involves uploading a malicious file with an executable extension through the legitimate registration process, then accessing the file through direct URL requests to the photoes/ directory. This attack vector demonstrates poor security architecture and inadequate validation of user-supplied content. Organizations using phpEmployment 1.8 should immediately implement multiple mitigations including strict file extension validation, mandatory file type checking, and proper access controls for uploaded files. The vulnerability highlights the importance of implementing Content Security Policy headers, restricting file upload directories, and ensuring that uploaded files are stored outside the web root. Additionally, implementing proper input validation and output encoding mechanisms would prevent this type of attack from succeeding, as recommended by CWE-174 and the NIST Cybersecurity Framework.