STIGQter: STIG Summary: Oracle Linux 6 Security Technical Implementation Guide Version: 2 Release: 3 Benchmark Date: 23 Apr 2021:

The SSH daemon must set a timeout count on idle sessions.

DISA Rule

SV-208922r603263_rule

Vulnerability Number

V-208922

Group Title

SRG-OS-000126

Rule Version

OL6-00-000231

Severity

CAT III

CCI(s)

• CCI-000879 - The organization terminates sessions and network connections when nonlocal maintenance is completed.

Weight

10

Fix Recommendation

To ensure the SSH idle timeout occurs precisely when the "ClientAliveCountMax" is set, edit "/etc/ssh/sshd_config" as follows:

ClientAliveCountMax 0

Check Contents

To ensure the SSH idle timeout will occur when the "ClientAliveCountMax" is set, run the following command:

# grep ClientAliveCountMax /etc/ssh/sshd_config

If properly configured, output should be:

ClientAliveCountMax 0

If it is not, this is a finding.

Vulnerability Number

V-208922

Documentable

False

Rule Version

OL6-00-000231

Severity Override Guidance

To ensure the SSH idle timeout will occur when the "ClientAliveCountMax" is set, run the following command:

# grep ClientAliveCountMax /etc/ssh/sshd_config

If properly configured, output should be:

ClientAliveCountMax 0

If it is not, this is a finding.

Check Content Reference

M

Target Key

2928

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