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Showing SKILL.md
Based on SOC occupation classification
| name | cis-ubuntu1204-v110-7-2-6 |
| description | Enable Bad Error Message Protection |
| category | cis-os-hardening |
| version | 1.1.0 |
| author | cyberstrike-official |
| tags | ["cis","ubuntu",12.04,"linux","networking","icmp","error-messages","sysctl","host-router"] |
| cis_id | 7.2.6 |
| cis_benchmark | CIS Ubuntu 12.04 LTS Server Benchmark v1.1.0 |
| tech_stack | ["ubuntu","linux"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | {} |
Setting icmp_ignore_bogus_error_responses to 1 prevents the kernel from logging bogus responses (RFC-1122 non-compliant) from broadcast reframes, keeping file systems from filling up with useless log messages.
Some routers (and some attackers) will send responses that violate RFC-1122 and attempt to fill up a log file system with many useless error messages.
Perform the following to determine if bogus messages will be ignored.
/sbin/sysctl net.ipv4.icmp_ignore_bogus_error_responses
net.ipv4.icmp_ignore_bogus_error_responses = 1
Set the net.ipv4.icmp_ignore_bogus_error_responses parameter to 1 in /etc/sysctl.conf:
net.ipv4.icmp_ignore_bogus_error_responses=1
Modify active kernel parameters to match:
/sbin/sysctl -w net.ipv4.icmp_ignore_bogus_error_responses=1
/sbin/sysctl -w net.ipv4.route.flush=1
Bogus error message protection is disabled by default.
Level 1 - Scored