The vCenter VAMI service must limit the number of allowed simultaneous session requests.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-259137	SRG-APP-000001-WSR-000001	VCLD-80-000001	SV-259137r1003685_rule	2024-07-11	2

Description
Denial of service (DoS) is one threat against web servers. Many DoS attacks attempt to consume web server resources in such a way that no more resources are available to satisfy legitimate requests. Mitigation against these threats is to take steps to limit the number of resources that can be consumed in certain ways. VAMI provides the "maxConnections" attribute of the <Connector Elements> to limit the number of concurrent Transmission Control Protocol (TCP) connections. This comes preconfigured with a tested, supported value that must be verified and maintained.

Description

Denial of service (DoS) is one threat against web servers. Many DoS attacks attempt to consume web server resources in such a way that no more resources are available to satisfy legitimate requests. Mitigation against these threats is to take steps to limit the number of resources that can be consumed in certain ways. VAMI provides the "maxConnections" attribute of the <Connector Elements> to limit the number of concurrent Transmission Control Protocol (TCP) connections. This comes preconfigured with a tested, supported value that must be verified and maintained.

ℹ️ Check
At the command prompt, run the following command: # /opt/vmware/cap_lighttpd/sbin/lighttpd -p -f /var/lib/vmware/cap-lighttpd/lighttpd.conf 2>/dev/null \|grep "server.max-connections" Example result: server.max-connections = 1024 If "server.max-connections" is not configured to 1024 or less, this is a finding. Note: The command must be run from a bash shell and not from a shell generated by the "appliance shell". Use the "chsh" command to change the shell for the account to "/bin/bash". Refer to KB Article 2100508 for more details: https://kb.vmware.com/s/article/2100508

ℹ️ Check

At the command prompt, run the following command: # /opt/vmware/cap_lighttpd/sbin/lighttpd -p -f /var/lib/vmware/cap-lighttpd/lighttpd.conf 2>/dev/null |grep "server.max-connections" Example result: server.max-connections = 1024 If "server.max-connections" is not configured to 1024 or less, this is a finding. Note: The command must be run from a bash shell and not from a shell generated by the "appliance shell". Use the "chsh" command to change the shell for the account to "/bin/bash". Refer to KB Article 2100508 for more details: https://kb.vmware.com/s/article/2100508

✔️ Fix
Navigate to and open: /var/lib/vmware/cap-lighttpd/lighttpd.conf Add or reconfigure the following value: server.max-connections = 1024 Restart the service with the following command: # systemctl restart cap-lighttpd