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FortiVoice v5.0 - Filter Bypass & Persistent Validation Vulnerability

Document Title:
FortiVoice v5.0 - Filter Bypass & Persistent Validation Vulnerability

References (Source):

Fortinet PSIRT ID:  1737213

Release Notes: http://docs.fortinet.com/uploaded/files/3081/fortiVoiceenterprise-5.0.5-release%20notes.pdf

Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

Product & Service Introduction:
FortiVoice phone systems and phones deliver intelligent call handling in a simple, affordable and user-friendly package.  
FortiVoice products are easy to install, easy to configure and easy to use, and come complete with everything a business needs  
to handle calls professionally, control costs and stay connected everywhere.

The FortiVoice Enterprise IP-PBX voice solutions are built for offices with up to 2000 phone users. FortiVoice Enterprise 
systems give you total call control and sophisticated communication features for excellent customer service and efficient 
employee collaboration. Powerful, affordable and simple, FortiVoice phone systems include everything you need to handle 
calls professionally, control communication costs and stay connected everywhere.

(Copy of the Homepage: http://www.fortivoice.com )

Abstract Advisory Information:
The vulnerability lab core team discovered multiple application-side web vulnerabilities in the official Fortinet FortiVoice v5.x appliance web-application.

Vulnerability Disclosure Timeline:
2016-05-11: Researcher Notification & Coordination (Benjamin Kunz Mejri - Evolution Security GmbH)
2016-05-12: Vendor Notification (PSIRT - Fortinet Security Team)
2016-06-26: Vendor Fix/Patch (Fortinet Developer Team)
2016-07-09: Acknowledgements (Fortiguard Security Team)
2016-08-09: Public Disclosure (Vulnerability Laboratory)

Discovery Status:

Affected Product(s):
Product: FortiVoice - Appliance (Web-Application) 5.0 (5.x) - FVE-20E2/4, 100E, 300E-T, 500E-T2, 1000E, 1000E-

Exploitation Technique:

Severity Level:

Technical Details & Description:
A filter bypass and multiple persistent cross site vulnerabilities has been discovered in the FortiVoice v5.x appliance web-application.
The application-side issue allows remote attackers to inject own malicious script codes on the application-side of the affected module.

The vulnerabilities are located in the `match pattern name` input fields of the `Outbound - Outbound - Dailed Number Match` and 
`Call Features - Fax - Sending Rules - Dailed Number Match` modules. Local low privileged user accounts and remote attackers are 
able to inject via POST method request own malicious script codes in the vulnerable modules. The attack vector of the issue is 
persistent on the application-side. The injection point are the vulnerable input fields and the execution point occurs mainly in 
the same web modules context.

The validation tries to encode strings on input interaction. To bypass the validation of the fortivoice appliance web-application, 
it is required to insert a split char attack via input fields. Use for example %20%20 after that the validation stops and you can execute 
an own payload.

The security risk of the application-side cross site web vulnerabilities are estimated as medium with a cvss (common vulnerability 
scoring system) count of 3.6. Exploitation of the persistent input validation web vulnerability requires a low privileged 
web-application user account but is not limited to and low or medium user interaction. Successful exploitation of the vulnerability 
results in session hijacking, persistent phishing attacks, persistent external redirects to malicious source and persistent manipulation 
of affected or connected application modules.

Request Method(s):
				[+] POST

Vulnerable Module(s):
				[+] Outbound - Outbound
				[+] Call Features - Fax - Sending Rules

Vulnerable Parameter(s):
				[+] name (match pattern)

Affected Module(s):
				[+] Dailed Number Match

Proof of Concept (PoC):
The persistent cross site vulnerabilities can be exploited by remote attackers and low privileged web-application user accounts 
with low or medium user interaction. For security demonstration or to reproduce the web vulnerability follow the provided 
information and steps below to continue.

Vulnerable Location(s):
Outbound - Outbound - Dailed Number Match [Match Pattern - Name]
Call Features - Fax - Sending Rules - Dailed Number Match [Match Pattern - Name]

PoC: Outbound - Outbound - Dail Number Match [Match Pattern - Name]
<div class="x-clear"></div></div><div style="overflow: visible;" id="ext-gen14302" class="x-grid3-scroller">
<div id="ext-gen14303" class="x-grid3-body"><div id="ext-gen17482" class="x-grid3-row x-grid3-row-selected " style="width:570px;">
<table class="x-grid3-row-table" style="width:570px;" border="0" cellpadding="0" cellspacing="0">
<tbody><tr><td id="ext-gen23162" class="x-grid3-col x-grid3-cell x-grid3-td-pattern x-grid3-cell-first " 
style="width:238px;" tabindex="0"><div id="ext-gen17483" class="x-grid3-cell-inner x-grid3-col-pattern" unselectable="on" 
ext:qtip="&quot;><[MALICIOUS INJECTED SCRIPT CODE EXECUTION!] id="ext-gen17484" src="a">%20>"<iframe>%20><img></div></td>
<td class="x-grid3-col x-grid3-cell x-grid3-td-strip " style="width:43px;" tabIndex="0" ><div class="x-grid3-cell-inner 
x-grid3-col-strip" unselectable="on" >-152725276</div></td><td class="x-grid3-col x-grid3-cell x-grid3-td-prefix " 
style="width:43px;" tabIndex="0" ><div class="x-grid3-cell-inner x-grid3-col-prefix" 
unselectable="on" >&quot;&gt;&lt;[MALICIOUS INJECTED SCRIPT CODE EXECUTION!]</div></td><td class="x-grid3-col x-grid3-cell 
x-grid3-td-postfix x-grid3-cell-last " style="width:238px;" tabIndex="0" ><div class="x-grid3-cell-inner x-grid3-col-postfix" 
unselectable="on" >&quot;&gt;&lt;[MALICIOUS INJECTED SCRIPT CODE EXECUTION!]</div></td></tr></tbody></table></div></iframe>
<a style="left: -181px; top: 0px;" id="ext-gen14304" href="#" class="x-grid3-focus" tabindex="-1"></a></div></div>
<div id="ext-gen14306" class="x-grid3-resize-marker">&nbsp;</div><div id="ext-gen14307" class="x-grid3-resize-proxy">

--- PoC Session Logs [POST] (Inject) ---
Status: 200[OK]
POST https://fortivoice.localhost:8000/module/admin.fe
   Request Header:
      User-Agent[Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Firefox/45.0]

--- PoC Session Logs [GET] (Execution) ---
Status: 200[OK]
GET https://fortivoice.localhost:8000/admin/x[PERSISTENT INJECTED SCRIPT CODE EXECUTION!] 
Request Header:
      User-Agent[Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Firefox/45.0]
      Cookie[fmAdmSesCurUser=demo; APSCOOKIE=Era%3D0%26Payload%3DBUDPevZ3vu6oNvnzczgUZUxDVECqaIRVjn889mdYzxdkD4%2FA45QQcLjmgW04i4Z3%0AS9YooynCQQOQN		      


Solution - Fix & Patch:
The vulnerabilities can be patched by a secure parse and encode of the vulnerable output location context in the affected modules.
Disallow the usage of special chars via restriction to prevent further script code injection attacks with application-side vector.
Encode the parameter inputs of the match pattern name in the two affected modules to finally fix the vulnerabilities.

Note: The vulnerability has been patched (FortiVoice v5.0.5 ) and the updates are available by automated download or 
manual via fortinet customer center.

Security Risk:
The security risk of the application-side input validation web vulnerabilities in the appliance web-application are estimated as medium. (CVSS 3.6)

Credits & Authors:
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri [http://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M.]

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