Detections
Analytics
UBTU-16-030590 - The Ubuntu operating system must not send Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirects - IPv4 Internet Control Message Protocol redirects.
Information
Internet Control Message Protocol (ICMP) redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages contain information from the system's route table, possibly revealing portions of the network topology.Solution
Configure the Ubuntu operating system to not allow interfaces to perform Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirects with the following command:# sudo sysctl -w net.ipv4.conf.all.send_redirects=0
If '0' is not the system's default value then add or update the following line in '/etc/sysctl.conf' or in the appropriate file under '/etc/sysctl.d':
net.ipv4.conf.all.send_redirects=0
See Also
https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_CAN_Ubuntu_16-04_LTS_V2R3_STIG.zip
Item Details
Audit Name: DISA STIG Ubuntu 16.04 LTS v2r3
Category: CONFIGURATION MANAGEMENT
References: 800-53|CM-6b., CAT|II, CCI|CCI-000366, Rule-ID|SV-215152r610931_rule, STIG-ID|UBTU-16-030590, STIG-Legacy|SV-90565, STIG-Legacy|V-75885, Vuln-ID|V-215152
Plugin: Unix
Control ID: c144a8b1c853a9adddf98c68f079a1e7c035ec0b1af9a9e08f43603917d3c992