How do I restrict TFTP access to certain hosts/IP addresses?

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Operating Systems AIX How do I restrict TFTP access to certain hosts/IP addresses?

03-29-2011

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How do I restrict TFTP access to certain hosts/IP addresses?

Hi Everyone,
I searched for an answer to this but couldn't find one so I'm hoping someone can lend some advice. My issue is that I have an AIX server running Sysback (for TSM backup/restore) and Sysback uses TFTP for sending the boot image to the client during a restore. A recent penetration test by Verizon has determined that this TFTP access is a major vulnerability. Does anyone know of a way to restrict TFTP access to only certain hosts on the network? Verizon recommends disabling TFTP in inetd.conf, but I can't do that because then Sysback restores would fail. Also, please note that is TFTP - not FTP.

Any help is greatly appreciated.

Thanks

need2bageek

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03-29-2011

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You can easily restrict it using TCP wrappers, which provide basic access control around inetd. See Chapter 5, Section 5.2 of the Redbook.

pludi

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04-01-2011

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Sweet. I downloaded the redbook and sounds like TCP Wrappers is exactly what I'm looking for. Seems like this will come in handy for many of the other vulnerabilities that were found, too. Thanks, pludi!

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