STIGQter: STIG Summary: SLES 12 Security Technical Implementation Guide Version: 2 Release: 3 Benchmark Date: 23 Apr 2021:

The SUSE operating system must be configured to use TCP syncookies.

DISA Rule

SV-217286r603262_rule

Vulnerability Number

V-217286

Group Title

SRG-OS-000142-GPOS-00071

Rule Version

SLES-12-030350

Severity

CAT II

CCI(s)

• CCI-001095 - The information system manages excess capacity, bandwidth, or other redundancy to limit the effects of information flooding types of denial of service attacks.

Weight

10

Fix Recommendation

Configure the SUSE operating system to use TCP syncookies by running the following command as an administrator:

# sudo sysctl -w net.ipv4.tcp_syncookies=1

If "1" is not the system's default value, add or update the following line in "/etc/sysctl.conf":

net.ipv4.tcp_syncookies = 1

Check Contents

Verify the SUSE operating system is configured to use TCP syncookies.

Check to see if syncookies are used with the following command:

# sudo sysctl net.ipv4.tcp_syncookies

net.ipv4.tcp_syncookies = 1

If the value is not set to "1", this is a finding.

Vulnerability Number

V-217286

Documentable

False

Rule Version

SLES-12-030350

Severity Override Guidance

Verify the SUSE operating system is configured to use TCP syncookies.

Check to see if syncookies are used with the following command:

# sudo sysctl net.ipv4.tcp_syncookies

net.ipv4.tcp_syncookies = 1

If the value is not set to "1", this is a finding.

Check Content Reference

M

Target Key

4033

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