TOSS must limit the number of concurrent sessions to 256 for all accounts and/or account types.
An XCCDF Rule
Description
<VulnDiscussion>Operating system management includes the ability to control the number of users and user sessions that utilize an operating system. Limiting the number of allowed users and sessions per user is helpful in reducing the risks related to Denial of Service (DoS) attacks. TOSS as an HPC operating system, is capable of supporting a large number of sessions, as well as tools which presume a larger number of concurrent sessions will be allowed. This requirement addresses concurrent sessions for information system accounts and does not address concurrent sessions by single users via multiple system accounts. The maximum number of concurrent sessions should be defined based upon mission needs and the operational environment for each system.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>
- ID
- SV-252947r958398_rule
- Severity
- Low
- References
- Updated
Remediation - Manual Procedure
Configure TOSS to limit the number of concurrent sessions to at most 256 for all accounts and/or account types.
Add the following line to the top of the /etc/security/limits.conf or in a ."conf" file defined in /etc/security/limits.d/:
* hard maxlogins 256