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 not allow interfaces to accept Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirect messages by default.

DISA Rule

SV-235019r622137_rule

Vulnerability Number

V-235019

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

SLES-15-040340

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

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

> sudo sysctl -w net.ipv4.conf.default.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.default.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 by default.

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

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

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

Vulnerability Number

V-235019

Documentable

False

Rule Version

SLES-15-040340

Severity Override Guidance

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

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

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

If the network parameter "ipv4.conf.default.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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