The Photon operating system must not respond to IPv4 Internet Control Message Protocol (ICMP) echoes sent to a broadcast address.
An XCCDF Rule
Description
<VulnDiscussion>Responding to broadcast (ICMP) echoes facilitates network mapping and provides a vector for amplification attacks.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>
- ID
- SV-256568r887378_rule
- Severity
- Medium
- References
- Updated
Remediation - Manual Procedure
At the command line, run the following commands:
# sed -i -e "/^net.ipv4.icmp_echo_ignore_broadcasts/d" /etc/sysctl.conf
# echo net.ipv4.icmp_echo_ignore_broadcasts=1>>/etc/sysctl.conf
# /sbin/sysctl --load