OL 8 must force a frequent session key renegotiation for SSH connections to the server.
An XCCDF Rule
Description
<VulnDiscussion>Unapproved mechanisms that are used for authentication to the cryptographic module are not verified and therefore cannot be relied on to provide confidentiality or integrity, and DoD data may be compromised. Operating systems using encryption are required to use FIPS-compliant mechanisms for authenticating to cryptographic modules. Session key regeneration limits the chances of a session key becoming compromised.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>
- ID
- SV-248868r877398_rule
- Severity
- Medium
- References
- Updated
Remediation - Manual Procedure
Configure the system to force a frequent session key renegotiation for SSH connections to the server by adding or modifying the following line in the "/etc/ssh/sshd_config" file:
RekeyLimit 1G 1h
The SSH daemon must be restarted for the settings to take effect.