Ensure sendmail version information is hidden

MittelStufe 1Automatisiertaix

Beschreibung

The recommendation is to change both the default sendmail greeting and HELP output to not display the sendmail version. The sendmail deamon has a history of security vulnerabilities. The recommendation is to change the default sendmail settings that display the sendmail version and other related information. Audit: SmtpGreetingMessage must be set without "Sendmail $b" and /etc/mail/helpfile must exist.

So wird geprüft

Prüfmethode: Shell-Befehl

shell

[ -r /etc/mail/sendmail.cf ] || exit 1; l=$(grep -i "^O SmtpGreetingMessage" /etc/mail/sendmail.cf); if [ -z "$l" ]; then echo "SmtpGreetingMessage not set"; else case "$l" in *"Sendmail \$b"*) echo "version disclosed: $l";; *) [ -e /etc/mail/helpfile ] && echo compliant || echo "sendmail helpfile missing";; esac; fi

Erwartete Ausgabe: compliant

So wird behoben

Behebungsmethode: Anleitung oder Infrastruktur-Patch

Create a backup copy of /etc/mail/sendmail.cf: cp -p /etc/mail/sendmail.cf /etc/mail/sendmail.cf.pre_cis Edit: vi /etc/mail/sendmail.cf Replace: O SmtpGreetingMessage=$j Sendmail $b With: O SmtpGreetingMessage=mailerready Ensure Sendmail helpfile exists test -e /etc/mail/helpfile || touch /etc/mail/helpfile

Eigenschaften

Betriebssysteme: Beliebig
Tags: aixservices
Referenz: CIS IBM AIX 7 Benchmark v1.2.0 - 4.6.4.1 Ensure sendmail version information is hidden

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shell

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