STIGQter STIGQter: STIG Summary: Canonical Ubuntu 16.04 Security Technical Implementation Guide Version: 1 Release: 3 Benchmark Date: 24 Jan 2020: The Ubuntu operating system must prevent Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirect messages from being accepted.

DISA Rule

SV-90559r3_rule

Vulnerability Number

V-75879

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

UBTU-16-030560

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

Configure the Ubuntu operating system to prevent Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirect messages from being acceptedr with the following command:

# sudo sysctl -w net.ipv4.conf.default.accept_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.default.accept_redirects=0

Check Contents

Verify the Ubuntu operating system will not accept IPv4 Internet Control Message Protocol (ICMP) redirect messages.

Check the value of the default "accept_redirects" variables with the following command:

# sudo sysctl net.ipv4.conf.default.accept_redirects

net.ipv4.conf.default.accept_redirects=0

If the returned line does not have a value of "0", or a line is not returned, this is a finding.

Vulnerability Number

V-75879

Documentable

False

Rule Version

UBTU-16-030560

Severity Override Guidance

Verify the Ubuntu operating system will not accept IPv4 Internet Control Message Protocol (ICMP) redirect messages.

Check the value of the default "accept_redirects" variables with the following command:

# sudo sysctl net.ipv4.conf.default.accept_redirects

net.ipv4.conf.default.accept_redirects=0

If the returned line does not have a value of "0", or a line is not returned, this is a finding.

Check Content Reference

M

Target Key

3075

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