Detections
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1.192 RHEL-09-253060

Information

RHEL 9 must limit the number of bogus Internet Control Message Protocol (ICMP) response errors logs.

GROUP ID: V-257967
RULE ID: SV-257967r991589

Some routers will send responses to broadcast frames that violate RFC-1122, which fills up a log file system with many useless error messages. An attacker may take advantage of this and attempt to flood the logs with bogus error logs. Ignoring bogus ICMP error responses reduces log size, although some activity would not be logged.

Solution

Configure RHEL 9 to not log bogus ICMP errors:

Add or edit the following line in a single system configuration file, in the "/etc/sysctl.d/" directory:

net.ipv4.icmp_ignore_bogus_error_responses = 1

Load settings from all system configuration files with the following command:

$ sudo sysctl --system

See Also

https://workbench.cisecurity.org/benchmarks/22008

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-6b., CAT|II, CCI|CCI-000366, Rule-ID|SV-257967r991589_rule, STIG-ID|RHEL-09-253060, Vuln-ID|V-257967

Plugin: Unix

Control ID: 4a6ebb5ff486ba2d8c40c8cb565e22921e1cf693de514994cbd2527e822258d7