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Test ID:1.3.6.1.4.1.25623.1.0.10250
Category:SMTP problems
Title:Sendmail redirection check
Summary:NOSUMMARY
Description:Description:

The remote SMTP server is vulnerable to a redirection attack. That is, if a
mail is sent to :

user@hostname1@victim

Then the remote SMTP server (victim) will happily send the mail to :
user@hostname1

Using this flaw, an attacker may route a message through your firewall, in
order to exploit other SMTP servers that can not be reached from the
outside.

Solution : In sendmail.cf, at the top of ruleset 98, in /etc/sendmail.cf,
insert the following statement :
R$*@$*@$* $#error $@ 5.7.1 $: '551 Sorry, no redirections.'

Risk factor : Low

CopyrightThis script is Copyright (C) 1999 Renaud Deraison

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