Bugtraq mailing list archives
Re: base64
From: Alexander Ogol <sanyok_nospam () prophysoft org ua>
Date: Tue, 23 Sep 2003 19:50:56 +0300
"IT" == Ilya Teterin writes:
[kham-kham-kham....argh....] IT> How to solve this issue? I believe we should rewrite at least IT> filtering systems to block malformed base64-encoded data because we IT> don't know is it malicious or not. Otherwise, we can meet new powerful IT> e-mail worm. Rewriting filtering systems for rejecting malformed mail couldn't be good decision in all situations. Some mailing lists (debian-russian, for example) add some 7bit information after letter body while re-forwarding, regardless of was the letter base64/QP encoded or not, resulting of such malformed mail (and if your mail server recodes all 8bit mail to base64, you have no way to write to those mail lists without creating malformed mail at result). So I think that the right solution (before antivirus software would be rewritten) is to write filters by yourself - decode base64 as that do popular mail clients and give them to antivirus. Of course, it's somehow more hard than just filtering up all those letters. -- Sincerely yours, Alexander Ogol, happy GNU/Linux user.
Current thread:
- base64 Ilya Teterin (Sep 22)
- Re: base64 Bennett Todd (Sep 22)
- Re: base64 Erwan David (Sep 23)
- Re: base64 Birl (Sep 23)
- Re: base64 Lothar Kimmeringer (Sep 24)
- Re: base64 David Wilson (Sep 24)
- Re: base64 Earl Hood (Sep 25)
- Re: base64 Christian Vogel (Sep 25)
- Re: base64 Seth Breidbart (Sep 24)
- Re: base64 Lothar Kimmeringer (Sep 24)
- Re: base64 Alexander Ogol (Sep 23)
- Re: base64 Christian Vogel (Sep 24)
- Re: base64 David Wilson (Sep 24)
- Re: base64 der Mouse (Sep 24)
- Re: base64 Christian Vogel (Sep 24)
- Re: base64 Earl Hood (Sep 26)
- <Possible follow-ups>
- RE: base64 latte (Sep 23)
- Re: base64 Ilya Teterin (Sep 23)
- Re: base64 MightyE (Sep 24)
- Re: base64 Buck Huppmann (Sep 24)
- Re: base64 Andrew Church (Sep 25)
- Message not available
- Re: base64 MightyE (Sep 25)
- Re: base64 Buck Huppmann (Sep 24)