SECURITY.NNOV: Special device access in The Bat!

Dear bugtraq,

Topic: Special device access in The Bat!
Author: 3APA3A <[email protected]>
Date: February, 25 2002
Software: The Bat! 1.53d, 1.54beta
Vendor: Ritlabs (http://www.thebat.net)
Risk: Low to average
Remote: Yes
Exploitable: Yes
Vendor Status: Notified, not verified

Details:

The Bat! has special device access bug. If The Bat! is configured to
save attachment apart from message bodies and file has a name of special
device The Bat! will attempt to open special device. This kind of bug
was described in [1]. This bug was probably reintroduced in one of
latest version, because our previous test with this product 6 months ago
failed.

It's not clear at that moment if it's possible to write special device
(for example to send attached file to printer or COM port), but this bug
definitely can be used as a DoS attack against The Bat!. After this
message The Bat! stops receiving of any messages (sometimes absolutely
silent, sometimes warning displayed that file can't be open).

Workaround:

Disable "Keep attachment files separately" option or use
Account/Dispatch Mail On Server option to delete problematic message
from server.

Vendor:

Vendor was contacted twice on February, 19. No replies received.

Exploitation:

bash-2.03$ sendmail -U [email protected]
From: test
To: test
Content-Type: apllication/exe; name=lpt1

Test
.

References:

[1] SECURITY.NNOV: Multiple archivers special DOS/Windows
devices access
http://www.security.nnov.ru/advisories/archdos.asp

–
http://www.security.nnov.ru
/\_/\
{ , . } |\
±-oQQo->{ ^ }<-----+ \
| ZARAZA U 3APA3A }
±------------o66o–+ /
|/
You know my name - look up my number (The Beatles)