STIGQter STIGQter: STIG Summary: SUSE Linux Enterprise Server 15 Security Technical Implementation Guide Version: 1 Release: 2 Benchmark Date: 23 Apr 2021:

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

DISA Rule

SV-235018r622137_rule

Vulnerability Number

V-235018

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

SLES-15-040330

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

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

Check Contents

Verify the SUSE operating system does not accept IPv4 ICMP redirect messages.

Check the value of the IPv4 accept_redirects variable with the following command:

> sudo sysctl net.ipv4.conf.all.accept_redirects
net.ipv4.conf.all.accept_redirects =0

If the network parameter "ipv4.conf.all.accept_redirects" is not equal to "0" or nothing is returned, this is a finding.

Vulnerability Number

V-235018

Documentable

False

Rule Version

SLES-15-040330

Severity Override Guidance

Verify the SUSE operating system does not accept IPv4 ICMP redirect messages.

Check the value of the IPv4 accept_redirects variable with the following command:

> sudo sysctl net.ipv4.conf.all.accept_redirects
net.ipv4.conf.all.accept_redirects =0

If the network parameter "ipv4.conf.all.accept_redirects" is not equal to "0" or nothing is returned, this is a finding.

Check Content Reference

M

Target Key

5274

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