STIGQter: STIG Summary: Oracle Linux 6 Security Technical Implementation Guide Version: 2 Release: 3 Benchmark Date: 23 Apr 2021:

The system must not respond to ICMPv4 sent to a broadcast address.

DISA Rule

SV-208860r603263_rule

Vulnerability Number

V-208860

Group Title

SRG-OS-000480

Rule Version

OL6-00-000092

Severity

CAT III

CCI(s)

• CCI-000366 - The organization implements the security configuration settings.

Weight

10

Fix Recommendation

To set the runtime status of the "net.ipv4.icmp_echo_ignore_broadcasts" kernel parameter, run the following command:

# sysctl -w net.ipv4.icmp_echo_ignore_broadcasts=1

If this is not the system's default value, add the following line to "/etc/sysctl.conf":

net.ipv4.icmp_echo_ignore_broadcasts = 1

Check Contents

The status of the "net.ipv4.icmp_echo_ignore_broadcasts" kernel parameter can be queried by running the following command:

$ sysctl net.ipv4.icmp_echo_ignore_broadcasts

The output of the command should indicate a value of "1". If this value is not the default value, investigate how it could have been adjusted at runtime, and verify it is not set improperly in "/etc/sysctl.conf".

$ grep net.ipv4.icmp_echo_ignore_broadcasts /etc/sysctl.conf

If the correct value is not returned, this is a finding.

Vulnerability Number

V-208860

Documentable

False

Rule Version

OL6-00-000092

Severity Override Guidance

The status of the "net.ipv4.icmp_echo_ignore_broadcasts" kernel parameter can be queried by running the following command:

$ sysctl net.ipv4.icmp_echo_ignore_broadcasts

The output of the command should indicate a value of "1". If this value is not the default value, investigate how it could have been adjusted at runtime, and verify it is not set improperly in "/etc/sysctl.conf".

$ grep net.ipv4.icmp_echo_ignore_broadcasts /etc/sysctl.conf

If the correct value is not returned, this is a finding.

Check Content Reference

M

Target Key

2928

Comments