CVE-2025-65602

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CVE-2025-65602 ChanCMS template injection vulnerability security critical severity RCE remote code execution CVE database chancms

Summary

CVE-2025-65602 is a critical severity template injection vulnerability affecting ChanCMS v3.3.4. This vulnerability allows unauthenticated attackers to execute arbitrary code on the server via a crafted POST request to the /vip/v1/file/save component, potentially leading to complete system compromise.

Technical Details

CVE-2025-65602 is a template injection vulnerability. Template injection occurs when user-supplied input is embedded into a template engine without proper sanitization. In this specific case, the /vip/v1/file/save component of ChanCMS v3.3.4 fails to adequately sanitize user-provided data within a POST request. An attacker can inject malicious template code into the request, which is then processed by the template engine, resulting in arbitrary code execution on the server. The vulnerability exists because the application uses user-controlled data to construct template strings without proper escaping or sanitization. This allows an attacker to inject arbitrary code into the template, which is then executed by the server. The lack of authentication required to exploit this vulnerability significantly increases its severity.

The attack vector involves crafting a malicious POST request to the /vip/v1/file/save endpoint. The request body contains specially crafted template code designed to execute system commands. Upon receiving the request, the ChanCMS application processes the malicious template code, leading to remote code execution (RCE).

Affected Products and Versions

  • ChanCMS v3.3.4

Impact Assessment

Successful exploitation of CVE-2025-65602 can have severe consequences, including:

  • Remote Code Execution (RCE): Attackers can execute arbitrary code on the server, gaining complete control of the system.
  • Data Breach: Attackers can access sensitive data stored on the server, leading to data breaches and potential financial losses.
  • System Compromise: Attackers can compromise the entire system, including databases, configuration files, and other critical components.
  • Denial of Service (DoS): Attackers can disrupt the availability of the application by executing resource-intensive commands or crashing the server.
  • Malware Installation: Attackers can install malware on the server, further compromising the system and potentially spreading to other connected systems.

Remediation

Immediate Actions

  • Isolate Affected Systems: Immediately isolate affected ChanCMS v3.3.4 installations from the network to prevent further exploitation.
  • Monitor for Suspicious Activity: Closely monitor system logs and network traffic for any signs of exploitation.
  • Review Access Controls: Ensure that access controls are properly configured and that only authorized users have access to sensitive data and resources.

Long-term Solutions

  • Upgrade to a Patched Version: Upgrade to a patched version of ChanCMS as soon as it becomes available. This is the most effective way to address the vulnerability. Check the official ChanCMS website or repository for updates.
  • Input Sanitization: Implement robust input sanitization techniques to prevent template injection. Ensure that all user-supplied data is properly validated and escaped before being used in template rendering.
  • Template Engine Security: Use a secure template engine and configure it with appropriate security settings. Avoid using template engines that are known to be vulnerable to template injection attacks.
  • Web Application Firewall (WAF): Deploy a web application firewall (WAF) to detect and block malicious requests targeting the /vip/v1/file/save endpoint. Configure the WAF to filter out requests containing suspicious template code.

References

Detection & Scanning

This vulnerability can be detected by analyzing HTTP request logs for suspicious POST requests to the /vip/v1/file/save endpoint containing template-like syntax (e.g., ${...}, {{...}}). Security scanners and web application firewalls (WAFs) can be configured to detect and block such requests. Pay close attention to POST requests with unusual characters or code snippets in the request body.

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