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02-15-2013, 11:31 AM
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#1
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Member
Registered: Jul 2010
Posts: 454
Rep:
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Sendmail - Disable Clear Text Logins
Hello, I am a merchant that is required to be PCI compliant. In a recent security audit I was told that I could not allow unencrypted clear text logins to SMTP. I am running CentOS along with Sendmail. How can I configure this to only allow encrypted logins?
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02-15-2013, 09:38 PM
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#2
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Member
Registered: Oct 2012
Distribution: OpenSuSE,RHEL,Fedora,OpenBSD
Posts: 982
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SMTP is not for logins it is for mail traffic. Insist your auditor shows you in the PCI standard where each requirement comes from. Some security auditors make up the requirements and should be out of business.
If you're not using inbound mail traffic close the SMTP service. If you are then consider whether you need to use TLS with SMTP (not a PCI expert but I'd be a bit surprised if that's needed).
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02-18-2013, 11:48 AM
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#3
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Member
Registered: Jul 2010
Posts: 454
Original Poster
Rep:
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The PHP contact form on my website uses the local SMTP server (localhost), I am guessing if I turn off SMTP, this would be broken right?
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02-18-2013, 01:04 PM
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#4
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Member
Registered: Oct 2012
Distribution: OpenSuSE,RHEL,Fedora,OpenBSD
Posts: 982
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Quote:
Originally Posted by CincinnatiKid
The PHP contact form on my website uses the local SMTP server (localhost), I am guessing if I turn off SMTP, this would be broken right?
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If you got the mail server to listen only on the localhost address it would still work for outbound mail but you would be unable to receive bounces for mailed mail. Traditional options are "sendmail -bt -q30m" but I like "sendmail -q30m" and using the sendmail binary for outbound mail.
In any case you should be able to convince an auditor SMTP is not for logins.
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02-21-2013, 03:27 PM
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#5
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Member
Registered: Jul 2010
Posts: 454
Original Poster
Rep:
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I had the PCI compliance company rescan my server, and this time, they didn't find anything wrong, so I passed PCI compliance. Don't know why it tested for "cleartext smpt logins" before.
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