V-240447

Discussion

The VRFY (Verify) command allows an attacker to determine if an account exists on a system, providing significant assistance to a brute force attack on user accounts. VRFY may provide additional information about users on the system, such as the full names of account owners.

Check Content

Use the following command to check if VRFY is disabled:

# grep -v "^#" /etc/sendmail.cf |grep -i PrivacyOptions

If "novrfy" is not returned, this is a finding.