Overview
A security vulnerability, identified as CVE-2025-13249, has been discovered in Jiusi OA, specifically in versions up to 20251102. This medium severity vulnerability allows for unrestricted file uploads due to improper handling of the FileData argument within the /OfficeServer?isAjaxDownloadTemplate=false endpoint. This vulnerability can be exploited remotely, and a public exploit is already available.
Technical Details
The vulnerability resides in the OfficeServer Interface component of Jiusi OA. By manipulating the FileData argument in requests to the /OfficeServer?isAjaxDownloadTemplate=false endpoint, an attacker can upload arbitrary files to the server. The lack of proper validation and sanitization of the uploaded file content and type allows for the execution of malicious code, potentially leading to server compromise.
The public exploit demonstrates how to craft a malicious request with a payload that bypasses any rudimentary checks present. The vulnerability stems from inadequate input validation on the server-side, allowing attackers to bypass intended restrictions.
CVSS Analysis
- CVE ID: CVE-2025-13249
- Severity: MEDIUM
- CVSS Score: 6.3
A CVSS score of 6.3 indicates a medium severity vulnerability. While it’s exploitable remotely and allows for significant impact (unrestricted file upload), the attacker still requires some level of interaction or knowledge of the specific vulnerable endpoint.
Possible Impact
Successful exploitation of this vulnerability could have significant consequences:
- Remote Code Execution (RCE): An attacker could upload and execute malicious code on the server, potentially gaining complete control.
- Data Breach: Uploaded malicious files could be used to exfiltrate sensitive data stored on the server.
- Denial of Service (DoS): An attacker could upload files that consume excessive resources, leading to a denial of service for legitimate users.
- Website Defacement: An attacker could upload files that modify the website’s content, leading to defacement.
Mitigation and Patch Steps
To mitigate the risk posed by CVE-2025-13249, the following steps are recommended:
- Apply the Patch: Check the Jiusi OA vendor’s website for an official patch or upgrade to a version where this vulnerability has been addressed. Contact Jiusi support for specific patching instructions.
- Input Validation: Implement strict input validation and sanitization on the server-side for all file uploads, especially for the
FileDataargument in the/OfficeServer?isAjaxDownloadTemplate=falseendpoint. - File Type Restrictions: Enforce strict file type restrictions to prevent the upload of executable files. Use a whitelist approach, allowing only necessary file types.
- Regular Security Audits: Conduct regular security audits and penetration testing to identify and address potential vulnerabilities in the Jiusi OA system.
- Web Application Firewall (WAF): Employ a Web Application Firewall (WAF) to detect and block malicious requests targeting this vulnerability. Configure the WAF to filter requests based on known exploit patterns.
