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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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EXPN and VRFY commands

Vulnerability Assessment Summary EXPN and VRFY checks Detailed Explanation for this Vulnerability Assessment The remote SMTP server answers to the EXPN and/or VRFY commands. The EXPN command can be used to find the delivery address of mail aliases, or even the full name of the recipients, and the VRFY command may be used to check the validity of an account. Your mailer should not permit remote users to use any of these commands, because it gives them too much information. Solution : if you are using Sendmail, add the option : O PrivacyOptions=goaway in /etc/sendmail.cf. Network Security Threat Level: Low Networks Security ID: Vulnerability Assessment Copyright: This script is Copyright (C) 1999 Renaud Deraison

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