An issue was discovered in the 3CX Phone System Management...

Vulnerability Description

An issue was discovered in the 3CX Phone System Management Console prior to version 18 Update 3 FINAL. An unauthenticated attacker could abuse improperly secured access to arbitrary files on the server (via /Electron/download directory traversal in conjunction with a path component that uses backslash characters), leading to cleartext credential disclosure. Afterwards, the authenticated attacker is able to upload a file that overwrites a 3CX service binary, leading to Remote Code Execution as NT AUTHORITY\SYSTEM on Windows installations. NOTE: this issue exists because of an incomplete fix for CVE-2022-48482.

References

• https://www.3cx.com/blog/change-log/phone-system-change-log/
• https://www.3cx.com/blog/releases/v18-update-3-final/
• https://www.3cx.com/blog/releases/v18-security-hotfix/
• https://medium.com/%40frycos/pwning-3cx-phone-management-backends-from-the-internet-d0096339dd88