What prevents an attack on Postfix through its named pipes?

Posted by Met?Ed on Server Fault See other posts from Server Fault or by Met?Ed
Published on 2012-11-28T21:57:33Z Indexed on 2012/11/28 23:05 UTC
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linux

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security

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postfix

What prevents an attack on Postfix through its named pipes by writing bogus data to them? I see on my system that they permit write access to other. I wonder if that opens Postfix to DoS or some other form of attack.

_{prw--w--w- 1 postfix postdrop 0 Nov 28 21:13 /var/spool/postfix/public/pickup}
_{prw--w--w- 1 postfix postdrop 0 Nov 28 21:13 /var/spool/postfix/public/qmgr}

I reviewed the pickup(8) man page, and searched here and elsewhere, but failed to turn up any answers.

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