| Titel | GL.iNet MT3000 4.4.5 Command Injection |
|---|
| Beschreibung | An authenticated configuration injection vulnerability exists in the OpenVPN client import workflow of the affected product. An attacker with admin credentials can upload a malicious .ovpn configuration file through the /upload endpoint. The file content is not validated for dangerous OpenVPN directives. When the imported configuration is later loaded by ovpnclient.sh, a sed filter only strips 4 directives (daemon, dev, dev-type, tun-mtu), leaving 200+ OpenVPN directives intact. Since the OpenVPN process is launched with --script-security 3 as root, an attacker can inject directives such as writepid, up, down, tls-verify, and client-connect to achieve arbitrary file creation or root command execution.
The reported vulnerable flow is:
Authenticated user
-> POST /upload (multipart with sid, path=/tmp/ovpn_upload/<name>.ovpn, file=<malicious .ovpn>)
-> oui-upload.lua checks path allowlist only, does NOT inspect file content
-> file written to /tmp/ovpn_upload/<name>.ovpn
-> POST /rpc calls ovpn-client.check_config(filename=<name>.ovpn)
-> ovpn-client.so reads the file, validates format only, does NOT check for dangerous directives
-> POST /rpc calls ovpn-client.confirm_config(group_id=...)
-> ovpn-client.so writes UCI entry: option path '/tmp/ovpn_upload/<name>.ovpn'
-> POST /rpc calls ovpn-client.start(group_id=..., client_id=...)
-> netifd reads UCI, calls ovpnclient.sh
-> ovpnclient.sh:50 applies sed filter (only removes 4 directives)
-> writepid / up / down / tls-verify etc. pass through untouched
-> ovpnclient.sh:66 launches: /usr/sbin/openvpn --script-security 3 --config <filtered file>
-> OpenVPN processes injected directives as root
-> arbitrary file creation (writepid) or command execution (up/down/tls-verify) |
|---|
| Quelle | ⚠️ https://github.com/StrTzz123/iot_vul/tree/main/GL-iNet/MT3000/4.4.5/ovpn_client_import |
|---|
| Benutzer | strforexc (UID 94617) |
|---|
| Einreichung | 06.05.2026 09:34 (vor 1 Monat) |
|---|
| Moderieren | 05.06.2026 20:26 (1 month later) |
|---|
| Status | Akzeptiert |
|---|
| VulDB Eintrag | 368966 [GL.iNet MT3000 bis 4.4.5 OpenVPN Client Import Workflow ovpnclient.sh erweiterte Rechte] |
|---|
| Punkte | 20 |
|---|