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From: -mat- filid brandy (brandy
KLAMMERAFFE.ORG)Date: Sat Apr 21 2001 - 13:19:00 CDT
This is a forwarded message
From: Bat Registrierservice <bathelp
is-web.com>
To: GardenStone
boudicca.de <GardenStone
boudicca.de>
Date: Saturday, April 21, 2001, 5:34:36 PM
Subject: The Bat! - Fehlermeldung [BUG-F8FEFAE1]
===8<==============Original message text===============
____________________________________________________________________
Nachricht vom : Freitag, 20. April 2001 <11:21>
zum Thema : The Bat! - Fehlermeldung [BUG-F8FEFAE1]
Bearbeitung: dhu <21.04.2001 - 17:32> Dieter Hummel
Status: done5e
____________________________________________________________________
Antwort von Ritlabs:
This is not a bug of The Bat! but a bug of MTA (POP3/SMTP servers)
that allow such odd messages. The proposed "bad-message"
(http://www.security.nnov.ru/files/badmess.zip) is not
RFC-compliant. Any RFC-compliant POP3/SMTP server must either bounce
or cure it. I've used a proposed example to send the message to
myself, on a FreeBSD server with Sendmail 8.11.1 I've typed
cat badmess | sendmail -U max
ritlabs.com
This message has been received by a KSI-Linux server with sendmail
8.8.8 and the POP3 to retrieve was Marc Crispin's daemon v2000.69.
The message has been received with orphaned LF's replaced to CR-LF
pairs. Some MTA software in transit has cured the message.
The Bat! could bounce such odd messages but it doesn't do it
intentionally because there are some odd mailserver that use single
LF as a line endings. These servers, however, will quote the dot in
the end of line and the proposed "bad-message" won't work with them
either.
...und eine weitere kurz hinterher:
I however made The Bat! to handle CR and LF that strictly to avoid
this vulnerability.
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