RE: Does In-Place Upgrade of Microsoft Exchange Create Open Relays?
From: jmcguire@sbcs.com
Date: 04/18/03
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- Maybe in reply to: Amarante, Rodrigo P.: "RE: Does In-Place Upgrade of Microsoft Exchange Create Open Relays?"
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Date: Fri, 18 Apr 2003 14:49:18 -0400 To: RPAmarante@directvla.com, Thor@HammerofGod.com, Jon.Kibler@aset.com, focus-ms@securityfocus.com From: jmcguire@sbcs.com
I have worked around Exchange SMTP relay by allowing relay for
authenticated users only. Since no one can authenticate it fails. Have
had problems with Exchange 5.5 and 2000 through different service packs
that when relaying appears to be turned off, it still functions.
__________________________________________
JOHN MCGUIRE CISSP, MCSE2k, MCSE+I
Network Security Specialist
888.529.0401
Strictly Business
www.sbcs.com
-----Original Message-----
From: Amarante, Rodrigo P. [mailto:RPAmarante@directvla.com]
Sent: Thursday, April 17, 2003 5:43 PM
To: Deus, Attonbitus; Jon R. Kibler; focus-ms@securityfocus.com
Subject: RE: Does In-Place Upgrade of Microsoft Exchange Create Open
Relays?
Some people don't realize that there are also a connector configuration
that could allow relaying. In the properties for the SMTP Connector for
the routing group, in the address space tab there's a check box that
states: "Allow messages to be relayed to these domains"
Since this is a SMTP connector to the "world" (AKA Internet Mail
Service), the "these domains" that the check box refer to are basic
everything (*). The connector's setting overrides the SMTP Virtual
Server settings....So if you don't want to relay, make sure the box is
not checked and that the SMTP Virtual Server is also not allowing
relaying.
-----Original Message-----
From: Deus, Attonbitus [mailto:Thor@HammerofGod.com]
Sent: Thursday, April 17, 2003 3:22 PM
To: Jon R. Kibler; focus-ms@securityfocus.com
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Hash: SHA1
At 11:18 AM 4/17/2003, Jon R. Kibler wrote:
>Over the past few months, we have seen a significant and steady
>increase in the number of open relay MTAs that are running Microsoft
>Exchange. In every case where we have been able to talk to someone at
>the organization running the open relay, the universal comment is "Our
>network consultant just upgraded our mail system."
>
>Since we are not an Exchange user, Microsoft will not discuss the issue
>with us. However, we have been able to talk to a few "network
>consultants" and the problem appears to occur when an existing (and
>secure) version of Exchange is upgraded in-place on the same host. We
>have been told that the problem is occurring on upgrades of Exchange
>5.x to Exchange 2000, and Exchange 2000 to Exchange 2000 Service Pack
>3.
>
>Apparently, either of these two upgrades will cause a previously secure
>version of Exchange to become an open relay that must be manually
>closed.
>
>One person also told us that they were told that the "Exchange 2000
>Post-Service Pack 3 (SP3) Rollup Patch 6396.1" was supposed to fix
>the problem, but they had not tried to find and apply the patch
>,and did not know anyone who had used it.
>
>Does anyone have any specific details on this problem?
I had the exact same thing happen some time ago when I applied SP3 to
one
of my remote office Exchange Servers. I could not figure it out for the
life of me, and could not get any help from MS on it. What was most
strange is that the IP restrictions were in the config, but anyone could
still relay mail through. I just figured I was temporarily insane,
which
these days is pretty common. I had to put the Exchange Server one hop
in,
and use a mail gateway to restrict my traffic. Since that was really
the
best way to do it anyway, I pretty much forgot about the issue until I
read
your post. I'll check out the rollup patch (which is not on that
machine
now) and see what happens.
T
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world's premier event for IT and network security experts. The two-day
Training features 6 hand-on courses on May 12-13 taught by professionals.
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sales pitches. Deadline for the best rates is April 25. Register today to
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- Previous message: Bianchi, H.: "RE: interoperability of VPN checkpoint FW1 to ISA"
- Maybe in reply to: Amarante, Rodrigo P.: "RE: Does In-Place Upgrade of Microsoft Exchange Create Open Relays?"
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] [ attachment ]
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