The vCenter VAMI service must restrict the ability of users to launch denial-of-service (DoS) attacks against other information systems or networks.

In UNIX and related computer operating systems, a file descriptor is an indicator used to access a file or other input/output resource, such as a pipe or network connection. File descriptors index into a per-process file descriptor table maintained by the kernel, which in turn indexes into a systemwide table of files opened by all processes, called the file table.

As a single-threaded server, Lighttpd must be limited in the number of file descriptors that can be allocated. This will prevent Lighttpd from being used in a form of DoS attack against the operating system.

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-fds"

Example result:

server.max-fds=2048

If "server.max-fds" is not set to 2048 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

Navigate to and open:

/var/lib/vmware/cap-lighttpd/lighttpd.conf

Add or reconfigure the following value:

server.max-fds = 2048

Restart the service with the following command:

# systemctl restart cap-lighttpd