Detections
Analytics

1.200 SLES-15-040330

Information

The SUSE operating system must prevent Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirect messages from being accepted.

GROUP ID: V-235018
RULE ID: SV-235018r991589

ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages modify the host's route table and are unauthenticated. An illicit ICMP redirect message could result in a man-in-the-middle attack.

Solution

Configure the SUSE operating system to not accept IPv4 ICMP redirect messages by running the following command as an administrator:

sudo sysctl -w net.ipv4.conf.all.accept_redirects=0

If "0" is not the system's default value, add or update the following line in "/etc/sysctl.d/99-stig.conf":

sudo sh -c 'echo "net.ipv4.conf.all.accept_redirects=0" >> /etc/sysctl.d/99-stig.conf' sudo sysctl --system

See Also

https://workbench.cisecurity.org/benchmarks/23779

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-6b., CAT|II, CCI|CCI-000366, Rule-ID|SV-235018r991589_rule, STIG-ID|SLES-15-040330, Vuln-ID|V-235018

Plugin: Unix

Control ID: ccbd705cff04469c12a4315206aca4642ba842c000f2e0cea9c0cd591013328d