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IPSwitch IMail 6.06 SMTP Remote System Access Vulnerability
Release Date:
April 24, 2001
Severity:
High
Systems Affected:
Systems running IPSwitch's IMail 6.06 SMTP daemon. Prior versions are most
likely vulnerable.
Description:
There exists a vulnerability within IMail that allows remote attackers to
gain SYSTEM level access to servers running IMail’s SMTP daemon. The
vulnerability stems from the IMail SMTP daemon not doing proper bounds
checking on various input data that gets passed to the IMail Mailing List
handler code. If an attacker crafts a special buffer and sends it to a
remote IMail SMTP server its possible that an attacker can remotely execute
code (commands) on the IMail system.
In order to overwrite EIP you must know the name of a valid mailing list.
IMail will happily provide you with a list of mailing lists by sending
imailsrv@example.com an eMail with the word "list" (without the quotes) in
the body of an eMail msg. Now take any valid mailing list name and put it
into the following SMTP session request and you will succesfully cause a
buffer overflow to happen within the IMail service which, if you supply a
specially crafted buffer, will result in the ability to remotely execute
code on the IMail server.
Client SMTP Session -> IMAIL SMTP
----------------------------------------------------
helo eeyerulez
mailfrom: <>
rcpt to: valid_mailing_list
data
From: [buffer] example.com
To: Whatever
wohooo!
.
quit
-----------------------------------------------------
Where [buffer] is 829 or so characters.
Check back to the eEye website as we will post an exploit at some point.
Credit:
Riley Hassell riley@eeye.com
Marc Maiffret marc@eeye.com
Vendor Status:
We would like to thank the people at IPSWITCH for immediately making this a
priority and releasing a patch very quickly. In fact IMail was able to get a
corrective patch out within two days of contacting them. That sort of vendor
response should be standard throughout the industry.
Users of IMail may download the IMail patches from:
http://ipswitch.com/support/IMail/patch-upgrades.html
Related Links:
eEye Digital Security http://www.eEye.com/
Greetings:
For all the people who have made life more interesting.
KAM, K2, Zen-Parse, Lamagra, Roland Postle, lsd from Poland and Martha
Stewart.
Copyright (c) 1998-2001 eEye Digital Security
Permission is hereby granted for the redistribution of this alert
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eEye. If you wish to reprint the whole or any part of this alert in any
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permission.
Disclaimer
The information within this paper may change without notice. Use of this
information constitutes acceptance for use in an AS IS condition. There are
NO warranties with regard to this information. In no event shall the author
be liable for any damages whatsoever arising out of or in connection with
the use or spread of this information. Any use of this information is at the
user's own risk.
Feedback
Please send suggestions, updates, and comments to:
eEye Digital Security
http://www.eEye.com
info@eEye.com
