CVE-2007-4527 in phUploader
Summary
by MITRE
Unrestricted file upload vulnerability in phUploader.php in phphq.Net phUploader 1.2 allows remote attackers to upload and execute arbitrary code via unspecified vectors. NOTE: the provenance of this information is unknown; the details are obtained solely from third party information.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 11/17/2025
The vulnerability identified as CVE-2007-4527 represents a critical unrestricted file upload flaw in phphq.Net phUploader version 1.2 specifically within the phUploader.php component. This type of vulnerability falls under the broader category of insecure file handling practices that have been consistently categorized by CWE-434 as "Unrestricted Upload of File with Dangerous Type." The flaw enables remote attackers to bypass normal file validation mechanisms and upload malicious files directly to the target server, creating a significant attack surface that can be exploited for various malicious purposes.
The technical nature of this vulnerability stems from inadequate input validation and sanitization within the file upload functionality of the phUploader application. When users attempt to upload files through the phUploader.php script, the system fails to properly verify the file types, extensions, or content, allowing attackers to submit files with potentially harmful code. This weakness creates an environment where attackers can upload web shells, malicious scripts, or other executable content that can be executed within the context of the web server. The unspecified vectors mentioned in the description suggest that the vulnerability may be exploitable through multiple attack paths, including direct file upload attempts or through manipulation of file parameters during the upload process.
The operational impact of this vulnerability is severe and multifaceted, as it provides attackers with a direct pathway to achieve remote code execution on the affected server. Once an attacker successfully uploads malicious content, they can execute arbitrary commands, potentially gaining full control over the web server, accessing sensitive data, or using the compromised system as a launch point for further attacks within the network. The vulnerability's remote exploitability means that attackers do not need physical access to the system or local network presence to carry out these attacks, making it particularly dangerous for publicly accessible web applications. This type of vulnerability directly aligns with ATT&CK technique T1190 "Exploit Public-Facing Application" and can be leveraged for subsequent attacks such as T1078 "Valid Accounts" or T1566 "Phishing" to establish persistence and further compromise.
The security implications extend beyond immediate code execution capabilities to include potential data breaches, service disruption, and system compromise that can affect the entire infrastructure. Organizations running vulnerable versions of phphq.Net phUploader are at risk of having their web applications turned into attack vectors for botnet recruitment, data exfiltration, or as staging areas for more sophisticated attacks. The vulnerability's classification as a remote code execution flaw places it within the high-risk category of security issues that require immediate remediation. Mitigation strategies should focus on implementing proper file type validation, restricting upload directories, implementing content verification mechanisms, and ensuring that uploaded files are stored outside the web root directory to prevent direct execution. Additionally, regular security audits and vulnerability assessments should be conducted to identify and remediate similar issues in other components of the web application stack.
This vulnerability exemplifies the critical importance of secure file upload handling in web applications and demonstrates how seemingly simple functionality can become a significant security risk when proper validation and sanitization measures are not implemented. The lack of detailed information regarding the specific exploitation vectors underscores the need for comprehensive security testing and the importance of maintaining up-to-date security practices to prevent such vulnerabilities from being exploited in real-world scenarios. Organizations should prioritize patching affected systems and implementing robust file upload validation controls to prevent similar issues from occurring in their own web applications.