From owner-freebsd-security Thu Aug 13 18:12:08 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id SAA22943 for freebsd-security-outgoing; Thu, 13 Aug 1998 18:12:08 -0700 (PDT) (envelope-from owner-freebsd-security@FreeBSD.ORG) Received: from khavrinen.lcs.mit.edu (khavrinen.lcs.mit.edu [18.24.4.193]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id SAA22860 for ; Thu, 13 Aug 1998 18:12:01 -0700 (PDT) (envelope-from wollman@khavrinen.lcs.mit.edu) Received: (from wollman@localhost) by khavrinen.lcs.mit.edu (8.9.1/8.9.1) id VAA02156; Thu, 13 Aug 1998 21:11:31 -0400 (EDT) (envelope-from wollman) Date: Thu, 13 Aug 1998 21:11:31 -0400 (EDT) From: Garrett Wollman Message-Id: <199808140111.VAA02156@khavrinen.lcs.mit.edu> To: security@FreeBSD.ORG Subject: Sendmail greeting Sender: owner-freebsd-security@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org 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