6.2 - Enumeration Countermeasures

 6.2 - Enumeration countermeasures 

 

SNMP Countermeasures 

By monitoring SNMP ports 161 and 162, enumeration attempts made by hackers can be detected. Disabling the SNMP service will stop enumeration attempts altogether. However, SNMP can be especially useful for network management so instead updating the SNMP service to patch bugs and vulnerabilities may be a better option. 

 

DNS Countermeasures 

Implementing DNS zone restrictions secures a DNS server as it will only give copies of zone files to whitelisted servers. Splitting DNS will also provide an additional layer of security. 

 

SMTP Countermeasures 

SMTP can be configured to ignore messages to unknown recipients and block open SMTP relaying. 

 

LDAP Countermeasures 

Blocking LDAP port 389 will stop enumeration attempts, however this has a risk of impacting the network. The best way to secure LDAP is to review and implement security settings and services. 

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