The Photon operating system must use Transmission Control Protocol (TCP) syncookies.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-256512 | PHTN-30-000036 | SV-256512r958528_rule | CCI-001095 | medium |
| Description | ||||
| A TCP SYN flood attack can cause a denial of service by filling a system's TCP connection table with connections in the SYN_RCVD state. Syncookies can be used to track a connection when a subsequent ACK is received, verifying the initiator is attempting a valid connection and is not a flood source. This feature is activated when a flood condition is detected and enables the system to continue servicing valid connection requests. Satisfies: SRG-OS-000142-GPOS-00071, SRG-OS-000420-GPOS-00186 | ||||
| STIG | Date | |||
| VMware vSphere 7.0 vCenter Appliance Photon OS Security Technical Implementation Guide | 2024-12-16 | |||
Details
Check Text (C-256512r958528_chk)
At the command line, run the following command:
# /sbin/sysctl -a --pattern tcp_syncookies
Expected result:
net.ipv4.tcp_syncookies = 1
If the output does not match the expected result, this is a finding.
Fix Text (F-60130r887209_fix)
At the command line, run the following commands:
# sed -i -e "/^net.ipv4.tcp_syncookies/d" /etc/sysctl.conf
# echo net.ipv4.tcp_syncookies=1>>/etc/sysctl.conf
# /sbin/sysctl --load