VAMI must limit the number of simultaneous requests.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-256645	VCLD-70-000001	SV-256645r888457_rule		Medium

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.

STIG	Date
VMware vSphere 7.0 VAMI Security Technical Implementation Guide	2023-02-22

Details

Check Text ( C-60320r888455_chk )
At the command prompt, run the following command: # /opt/vmware/sbin/vami-lighttpd -p -f /opt/vmware/etc/lighttpd/lighttpd.conf 2>/dev/null \|grep "server.max-connections"\|sed -e 's/^[ ]*//' Expected result: server.max-connections = 1024 If the output does not match the expected result, 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

Check Text ( C-60320r888455_chk )

At the command prompt, run the following command:

# /opt/vmware/sbin/vami-lighttpd -p -f /opt/vmware/etc/lighttpd/lighttpd.conf 2>/dev/null |grep "server.max-connections"|sed -e 's/^[ ]*//'

Expected result:

server.max-connections = 1024

If the output does not match the expected result, 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 Text (F-60263r888456_fix)
Navigate to and open: /opt/vmware/etc/lighttpd/lighttpd.conf Add or reconfigure the following value: server.max-connections = 1024 Restart the service with the following command: # vmon-cli --restart applmgmt