Detections
Analytics
PHTN-30-000036 - The Photon operating system must use Transmission Control Protocol (TCP) syncookies.
Information
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
Solution
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
See Also
https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_VMW_vSphere_7-0_Y25M01_STIG.zip
Item Details
Audit Name: DISA STIG VMware vSphere 7.0 Photon OS v1r4
Category: SYSTEM AND COMMUNICATIONS PROTECTION
References: 800-53|SC-5, 800-53|SC-5(2), CAT|II, CCI|CCI-001095, CCI|CCI-002385, Rule-ID|SV-256512r958528_rule, STIG-ID|PHTN-30-000036, Vuln-ID|V-256512
Plugin: Unix
Control ID: 1b7a89efce935d92808a7d755aae6a0bf5ccd97042e824bd32aae18e05ba57b1