Date: Thu, 13 Aug 1998 21:11:31 -0400 (EDT) From: Garrett Wollman <wollman@khavrinen.lcs.mit.edu> To: security@FreeBSD.ORG Subject: Sendmail greeting Message-ID: <199808140111.VAA02156@khavrinen.lcs.mit.edu>
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It's widely understood that giving detailed version information away to attackers is a Bad Idea. Why does the default sendmail.cf leave the default sendmail greeting? I just updated my desktop machine after nine months of stasis, and one of the first things I did when migrating my .mc file over was to add the following: define(`confSMTP_LOGIN_MSG', `$j server ready at $b')dnl This gives a greeting like: 220 khavrinen.lcs.mit.edu ESMTP server ready at Thu, 13 Aug 1998 21:10:03 -0400 (EDT) ...which doesn't leak any version information at all. (BTW, having sendmail/cf in contrib sucks rocks. Now my domain file is totally separate from my mc files.) -GAWollman -- Garrett A. Wollman | O Siem / We are all family / O Siem / We're all the same wollman@lcs.mit.edu | O Siem / The fires of freedom Opinions not those of| Dance in the burning flame MIT, LCS, CRS, or NSA| - Susan Aglukark and Chad Irschick To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe security" in the body of the message
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