=======================================================================
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
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Consult
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of new offensive and defensive technologies for our customers.
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and valid
recommendation about the risk profile of new technologies.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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EOF Johannes Kruchem / @2020
