Date: Thu, 4 Feb 1999 13:51:32 -0800
From: Marc <marc@EEYE.COM>
To: BUGTRAQ@NETSPACE.ORG
Subject: Multiple SLMail Vulnerabilities
________________________________________________________________________
eEye Digital Security Team <e>
www.eEye.com
info@eEye.com
February 04, 1999
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Multiple SLMail Vulnerabilities
Systems Affected
SLMail 3.1
Release Date
February 04, 1999
Advisory Code
AD02041999
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Description:
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We were once again grinding software through Retina Alpha code and have
found the following.
One of the ports that SLMail's POP Service listens on is port 27. It
provides ESMTP functionality. The only difference between it and SLMail's
SMTP service is that port 27 provides the "turn" functions. All
vulnerabilities are based off of the port 27 service.
The first vulnerability involves the "helo" command. There are two
vulnerabilities within it. The first is sending "helo" followed by 819 to
849 characters. This will send the servers CPU to idle around 90%.
The second vulnerability in the "helo" command is a buffer overflow. If you
issue "helo" followed by 855 to 2041 characters the server will crash with
your typical overflow error.
The second set of vulnerabilities are with the "vrfy" and "expn" commands.
We have not tested to find the start and stop string lengths but sending
"vrfy" or "expn" with 2041 characters will cause the SLMail.exe to exit
itself.
So we can either send the CPU to 90%, overflow some buffers, or have the
server exit without a trace. Take your pick.
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Vendor Status
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We gave SeattleLabs a week. We have no reply so far. Contact them directly
and maybe they will respond.
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Copyright (c) 1999 eEye Digital Security Team
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________________________________________________________________________
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________________________________________________________________________
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