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Home >> Browse Vulnerability Assessment Database >> SMTP problems >> Sendmail redirection check


Vulnerability Assessment Details

Sendmail redirection check

Vulnerability Assessment Summary
Redirection check

Detailed Explanation for this Vulnerability Assessment

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, a possible hacker 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.'

Network Security Threat Level: Low

Networks Security ID:

Vulnerability Assessment Copyright: This script is Copyright (C) 1999 Renaud Deraison

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