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SEC Consult Vulnerability Lab Security Advisory < 20200122-0 >  
=======================================================================  
title: Reflected XSS  
product: ZOHO ManageEngine ServiceDeskPlus  
vulnerable version: <= 11.0 Build 11007  
fixed version: 11.0 Build 11010  
CVE number: CVE-2020-6843  
impact: medium  
homepage: https://www.manageengine.com/products/service-desk/  
found: 2019-12-01  
by: Johannes Kruchem (Office Vienna)  
SEC Consult Vulnerability Lab  
  
An integrated part of SEC Consult  
Europe | Asia | North America  
  
https://www.sec-consult.com  
  
=======================================================================  
  
Vendor description:  
-------------------  
"ServiceDesk Plus is a game changer in turning IT teams from daily fire-fighting  
to delivering awesome customer service. It provides great visibility and central  
control in dealing with IT issues to ensure that businesses suffer no downtime.  
For 10 years and running, it has been delivering smiles to millions of IT folks,  
end users, and stakeholders alike."  
  
Source: https://www.manageengine.com/products/service-desk/  
  
  
  
Business recommendation:  
------------------------  
The vendor published a patch for ServiceDesk Plus with service pack 11010.  
  
It is recommended to install the patch with the included patcher. An in-depth  
security analysis performed by security professionals is highly advised, as the  
software may be affected from further security issues.  
  
  
Vulnerability overview/description:  
-----------------------------------  
1) Reflected Cross-Site Scripting (CVE-2020-6843)  
A parameter of the module called "geti18nkey" reflects unfiltered user input if  
it is changed. The corresponding request is frequently sent in the background  
if a pre-configured network scan was started.  
  
  
Proof of concept:  
-----------------  
1) Reflected Cross-Site Scripting (CVE-2020-6843)  
To reproduce the issue visit this URL authenticated as administrator:  
http://$IP:8080/CustomReportHandler.do?module=geti18nkey&key=<img%20src%20onerror%3dalert(1)>  
  
How the parameter was found:  
1) Authenticate as administrator and add an IP range in Admin -> Networkscan.  
2) Click the "play" button next to the created IP range to start the scan.  
3) To check the status of a started network scan frequent requests like  
"http://$IP:8080/CustomReportHandler.do?module=geti18nkey&key=sdp.admin.network.listview.discoverystatus.scanned&sdpcsrfparam=<%someUUID%>"  
are sent to the server.  
4) The value of the "key" parameter will be reflected if you change a single character.  
The "sdpcsrfparam" isn't needed in order to trigger the XSS.  
5) XSS can thus be exploited by calling  
"http://$IP:8080/CustomReportHandler.do?module=geti18nkey&key=<img%20src%20onerror%3dalert(1)>"  
  
  
Vulnerable / tested versions:  
-----------------------------  
The following versions have been tested which were the latest versions available at the  
time of the test:  
- 10.5  
- 11.0 Build 11007  
  
  
Vendor contact timeline:  
------------------------  
2019-12-05: Contacting vendor through ManageEngine Security Response Center (MESRC)  
Uploaded security advisory to bugbounty.zoho.com  
2019-12-09: Vendor promised to fix the vulnerability.  
2020-01-08: Reported issue has been fixed in service pack 11010.  
2020-01-22: Public release of security advisory.  
  
  
Solution:  
---------  
The vendor provides an updated version which should be installed immediately.  
https://www.manageengine.com/products/service-desk/download.html  
  
The vendor also provided a link to their readme about the new release:  
https://www.manageengine.com/products/service-desk/readme.html#11010  
  
  
Workaround:  
-----------  
None  
  
  
Advisory URL:  
-------------  
https://www.sec-consult.com/en/vulnerability-lab/advisories/index.html  
  
  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
  
SEC Consult Vulnerability Lab  
  
SEC Consult  
Europe | Asia | North America  
  
About SEC Consult Vulnerability Lab  
The SEC Consult Vulnerability Lab is an integrated part of SEC Consult. It  
ensures the continued knowledge gain of SEC Consult in the field of network  
and application security to stay ahead of the attacker. The SEC Consult  
Vulnerability Lab supports high-quality penetration testing and the evaluation  
of new offensive and defensive technologies for our customers. Hence our  
customers obtain the most current information about vulnerabilities and valid  
recommendation about the risk profile of new technologies.  
  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
  
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EOF Johannes Kruchem / @2020