Port 143: IMAP
Analyze default service protocols, historical security vulnerabilities, hardening methods, and firewall rules for port 143.
1. Port Purpose & Usage
Internet Message Access Protocol (IMAP) is a standard protocol used by email clients to retrieve messages from a mail server. Unlike POP3, IMAP leaves mail on the server, permitting access from multiple devices.
Common Service Implementations
A secure, high-performance IMAP and POP3 server for Linux systems.
Fast, secure IMAP mail server.
2. Security Risks & Vulnerability Profiles
IMAP traffic on port 143 is unencrypted by default. Mailboxes, folders, and access credentials can be harvested by attackers on the network path.
Historical CVE References
Dovecot Buffer Overflow. An issue in the IMAP login process allowed authenticated users to trigger memory corruption and execute arbitrary code.
3. Hardening & Mitigation Checklist
4. Firewall Command Examples
Use the following system configurations to restrict open port exposure on Linux hosts:
Further Analysis
Email Infrastructure Ports
Ports often operate in clusters. When analyzing a service on Port 143, security engineers typically check the status of these related ports.