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From: eEye Digital Security (eeyeEEYE.COM)
Date: Tue Apr 24 2001 - 19:32:40 CDT
IPSwitch IMail 6.06 SMTP Remote System Access Vulnerability
April 24, 2001
Systems running IPSwitch's IMail 6.06 SMTP daemon. Prior versions are most
There exists a vulnerability within IMail that allows remote attackers to
gain SYSTEM level access to servers running IMailís 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
imailsrvexample.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
rcpt to: valid_mailing_list
From: [buffer] example.com
Where [buffer] is 829 or so characters.
Check back to the eEye website as we will post an exploit at some point.
Riley Hassell rileyeeye.com
Marc Maiffret marceeye.com
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:
eEye Digital Security http://www.eEye.com/
For all the people who have made life more interesting.
KAM, K2, Zen-Parse, Lamagra, Roland Postle, lsd from Poland and Martha
Copyright (c) 1998-2001 eEye Digital Security
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