Overview
CVE-2025-63889 describes an arbitrary file read vulnerability affecting ThinkPHP version 5.0.24. This vulnerability allows attackers to potentially read sensitive files on the server by crafting a malicious file path within a template value processed by the fetch function in thinkphp\library\think\Template.php.
Technical Details
The vulnerability resides in the way ThinkPHP 5.0.24 handles user-supplied input when rendering templates. Specifically, the fetch function, responsible for loading and processing template files, is susceptible to path traversal attacks. By manipulating the template value with carefully constructed file paths (e.g., using ../ sequences), an attacker can bypass intended security restrictions and access files outside the designated template directory.
The vulnerability manifests when user-controlled data is passed to the fetch function without proper sanitization or validation. This allows attackers to inject malicious file paths into the template loading process, leading to the disclosure of sensitive information.
CVSS Analysis
Currently, a CVSS score and severity rating are not available (N/A) for CVE-2025-63889. This may be due to ongoing analysis or lack of official scoring. However, the potential for arbitrary file read suggests a significant security risk, warranting immediate attention and mitigation.
Possible Impact
The successful exploitation of CVE-2025-63889 can have severe consequences, including:
- Exposure of sensitive configuration files: Attackers may read database credentials, API keys, and other critical configuration data.
- Source code disclosure: The vulnerability could allow attackers to access and analyze the application’s source code, potentially revealing further vulnerabilities.
- Data breaches: Sensitive user data or other confidential information stored on the server could be exposed.
- Privilege escalation: In some cases, reading specific system files could facilitate privilege escalation attacks.
Mitigation and Patch Steps
To mitigate the risk associated with CVE-2025-63889, the following steps are recommended:
- Upgrade ThinkPHP: Upgrade to a patched version of ThinkPHP that addresses this vulnerability. Check the official ThinkPHP website for the latest security updates. While no specific version is mentioned as patched in the provided details, upgrading to the latest stable version is generally a good practice.
- Input Sanitization: Implement strict input validation and sanitization for all user-supplied data used in template rendering, especially file paths. Prevent the use of path traversal sequences (e.g.,
../) or other potentially malicious characters. - Principle of Least Privilege: Ensure that the web server process has only the necessary permissions to access required files and directories. This limits the potential damage caused by an exploited vulnerability.
- Web Application Firewall (WAF): Deploy a WAF to detect and block malicious requests targeting this vulnerability. Configure the WAF to filter out suspicious file path patterns.
References
Gist: Master-0-0 – CVE-2025-63889 Details
Yuque: ThinkPHP 5.0.24 Vulnerability Analysis (Chinese)
