Telesquare SKT LTE Router SDT-CS3B1 CSRF System Command Execution Vendor: Telesquare Co., Ltd. Product web page: Affected version: FwVer: SDT-CS3B1, sw version 1.2.0 LteVer: ML300S5XEA41_090 1 0.1.0 Modem model: PM-L300S Summary: We introduce SDT-CS3B1 LTE router which is a SKT 3G and 4G LTE wireless communication based LTE router product. Desc: The router suffers from authenticated arbitrary system command execution. The application interface allows users to perform certain actions via HTTP requests without performing any validity checks to verify the requests. This can be exploited to perform certain actions with administrative privileges if a logged-in user visits a malicious web site. Tested on: lighttpd/1.4.20 Vulnerability discovered by Gjoko 'LiquidWorm' Krstic @zeroscience Advisory ID: ZSL-2017-5443 Advisory URL: 22.12.2017 -- IDOR for system command interface: ---------------------------------- GET /admin/system_command.shtml HTTP/1.1 PoC GET CSRF request: ---------------------