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 6 (IPv6) Internet Control Message Protocol (ICMP) redirect messages from being accepted.

DISA Rule

SV-235020r622137_rule

Vulnerability Number

V-235020

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

SLES-15-040341

Severity

CAT II

CCI(s)

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

Weight

10

Fix Recommendation

Configure the SUSE operating system to not accept IPv6 ICMP redirect messages by running the following command as an administrator:

> sudo sysctl -w net.ipv6.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.ipv6.conf.all.accept_redirects=0" >> /etc/sysctl.d/99-stig.conf'

> sudo sysctl --system

Check Contents

Verify the SUSE operating system does not accept IPv6 ICMP redirect messages.

Check the value of the IPv6 accept_redirects variable with the following command:

> sudo sysctl net.ipv6.conf.all.accept_redirects
net.ipv6.conf.all.accept_redirects =0

If the network parameter "ipv6.conf.all.accept_redirects" is not equal to "0" or nothing is returned, this is a finding.

Vulnerability Number

V-235020

Documentable

False

Rule Version

SLES-15-040341

Severity Override Guidance

Verify the SUSE operating system does not accept IPv6 ICMP redirect messages.

Check the value of the IPv6 accept_redirects variable with the following command:

> sudo sysctl net.ipv6.conf.all.accept_redirects
net.ipv6.conf.all.accept_redirects =0

If the network parameter "ipv6.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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