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Vulnerability Assessment & Network Security Forums |
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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. Home >> Browse Vulnerability Assessment Database >> SMTP problems >> Sendmail redirection check Vulnerability Assessment Details
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Sendmail redirection check |
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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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Cables, Connectors |
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