cyberstrikeus 2.2.10 Ensure IMAP and POP3 server are not installed (Automated)
Profile
- Level 1 - Server
- Level 1 - Workstation
Description
dovecot-imapd and dovecot-pop3d are an open source IMAP and POP3 server for Linux based systems.
Rationale
Unless POP3 and/or IMAP servers are to be provided by this system, it is recommended that the package be removed to reduce the potential attack surface.
Audit Procedure
Command Line
Run the following command to verify dovecot-imapd is not installed:
# dpkg-query -s dovecot-imapd &>/dev/null && echo "dovecot-imapd is installed"
Nothing should be returned.
Run the following command to verify dovecot-pop3d is not installed:
# dpkg-query -s dovecot-pop3d &>/dev/null && echo "dovecot-pop3d is installed"
Nothing should be returned.
Expected Result
No output (empty result) for both commands.
Remediation
Command Line
Run one of the following commands to remove dovecot-imapd and dovecot-pop3d:
# apt purge dovecot-imapd dovecot-pop3d
References
- NIST SP 800-53 Rev. 5: CM-7
Additional Information:
Several IMAP/POP3 servers exist and can use other service names. courier-imap and cyrus-imap are example services that provide a mail server. These and other services should also be audited.
CIS Controls
- v8: 4.8 - Uninstall or Disable Unnecessary Services on Enterprise Assets and Software
- v7: 9.2 - Ensure Only Approved Ports, Protocols and Services Are Running