YouDataSum CPAS Audit Management System V4 contains a path traversal vulnerability that allows…

Why it is Yellow

• CVSS 7.5 high
• Remotely exploitable without logging in

References

• https://github.com/eeeeeeeeee-code/POC/blob/main/wpoc/%E5%8C%97%E4%BA%AC%E5%8F%8B%E6%95%B0%E8%81%9A%E7%A7%91%E6%8A%80/CPAS%E5%AE%A1%E8%AE%A1%E7%AE%A1%E7%90%86%E7%B3%BB%E7%BB%9F%E5%AD%98%E5%9C%A8%E4%BB%BB%E6%84%8F%E6%96%87%E4%BB%B6%E8%AF%BB%E5%8F%96%E6%BC%8F%E6%B4%9E.md
• https://github.com/gelusus/wxvl/blob/main/doc/2024-12/%E3%80%8C%E6%BC%8F%E6%B4%9E%E5%A4%8D%E7%8E%B0%E3%80%8D%E5%8F%8B%E6%95%B0%E8%81%9A%20CPAS%E5%AE%A1%E8%AE%A1%E7%AE%A1%E7%90%86%E7%B3%BB%E7%BB%9FV4%20downPlugs%20%E4%BB%BB%E6%84%8F%E6%96%87%E4%BB%B6%E8%AF%BB%E5%8F%96%E6%BC%8F%E6%B4%9E.md
• https://github.com/projectdiscovery/nuclei-templates/blob/main/http/vulnerabilities/other/cpas-managment-lfi.yaml
• https://www.vulncheck.com/advisories/youdatasum-cpas-audit-management-system-v4-path-traversal-via-downplugs-fileid
• https://www.youdatasum.com/

Original description

YouDataSum CPAS Audit Management System V4 contains a path traversal vulnerability that allows unauthenticated attackers to read arbitrary files by manipulating the fileId parameter. Attackers can send GET requests to /cpasm4/plugInManController/downPlugs with ../ sequences in fileId to retrieve system files like /etc/passwd. Exploitation evidence was first observed by the Shadowserver Foundation on 2025-01-13.