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Kaseya VSA 9.2 Authentication Bypass

Kaseya VSA 9.2 Authentication Bypass
Posted Jan 15, 2018
Authored by Securify B.V., Kin Hung Cheng, Robert Hartshorn

Kaseya VSA version 9.2 suffers from an authentication bypass vulnerability.

tags | exploit, bypass
MD5 | 7283fc16d75dc79988225cb4c903d5c5

Kaseya VSA 9.2 Authentication Bypass

Change Mirror Download
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Authentication bypass in Kaseya VSA
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Kin Hung Cheng, Robert Hartshorn, May 2017

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Abstract
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A security vulnerability was found in Kaseya VSA that allows users to
view remote computers that they are not authorised to view. Using this
vulnerability a user that is authenticated to view at least one remote
computer can view ever machines in the Kaseya application.

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Tested versions
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This issue was successfully tested on version R9.2

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Fix
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Patch to the latest version of VSA.

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Details
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https://www.securify.nl/advisory/SFY20170504/authentication-bypass-in-kaseya-vsa.html

An authenticated user in Kaseya for viewing some remote computers can view every remote computer on the server. This is done via changing the URL to point to the remote computer that the person wants to view. As stated above, this issue should be present in all calls to the remote computer, but due to scope, we could not test every vector.

Steps to reproduce

- Change the agentGuid in the URL

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