Overview
This article provides an in-depth analysis of CVE-2025-63695, a critical vulnerability affecting DzzOffice v2.3.7 and earlier. This vulnerability allows for arbitrary file uploads, potentially leading to remote code execution and complete system compromise. DzzOffice is a web-based office collaboration platform, and this security flaw poses a significant risk to organizations using the affected versions.
Technical Details
CVE-2025-63695 is located in the /dzz/system/ueditor/php/controller.php file of DzzOffice. The vulnerability stems from insufficient input validation and sanitization during the file upload process. Attackers can bypass intended restrictions and upload malicious files, such as PHP scripts, to the server. These files can then be accessed and executed, allowing the attacker to gain control of the web server.
CVSS Analysis
Currently, no CVSS score has been assigned to CVE-2025-63695. However, considering the potential for remote code execution and complete system compromise resulting from an arbitrary file upload, a critical severity rating is highly probable. A high CVSS score (e.g., 9.0 or higher) is anticipated based on the impact.
CVSS Score: N/A
Possible Impact
The impact of this vulnerability can be severe. A successful exploit could result in:
- Remote Code Execution (RCE): An attacker can execute arbitrary code on the server.
- System Compromise: The attacker could gain full control of the DzzOffice server.
- Data Breach: Sensitive data stored on the server could be compromised.
- Denial of Service (DoS): The attacker could crash the server, making it unavailable to legitimate users.
- Website Defacement: The attacker can change the appearance of the website, injecting malicious content, or redirecting visitors.
Mitigation and Patch Steps
To mitigate the risk posed by CVE-2025-63695, we recommend the following:
- Upgrade DzzOffice: Upgrade to a version of DzzOffice that includes a fix for this vulnerability. Check the DzzOffice website for updates and security patches.
- Input Validation: Implement robust input validation and sanitization on the server-side to prevent malicious file uploads. Verify file extensions, file types, and file sizes.
- Web Application Firewall (WAF): Deploy a Web Application Firewall (WAF) to detect and block malicious file upload attempts. Configure the WAF to block uploads of potentially dangerous file types (e.g., .php, .jsp, .asp).
- File Upload Restrictions: Restrict the types of files that can be uploaded to the server. Only allow necessary file types and block all others.
- Regular Security Audits: Conduct regular security audits and penetration testing to identify and address vulnerabilities in DzzOffice and other web applications.
References
GitHub – Yohane-Mashiro/dzzoffice_upload
GitHub – zyx0814/dzzoffice – Issue #365
