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If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important.  If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery.

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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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