Detections
Analytics

PHTN-67-000113 - The Photon operating system must send TCP timestamps.

Information

TCP timestamps are used to provide protection against wrapped sequence numbers. It is possible to calculate system uptime (and boot time) by analyzing TCP timestamps. These calculated uptimes can help a bad actor in determining likely patch levels for vulnerabilities.

Solution

Open /etc/sysctl.conf with a text editor.

Add or update the following line:

net.ipv4.tcp_timestamps = 1

Run the following command to load the new setting:

# /sbin/sysctl --load

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_VMW_vSphere_6-7_Y23M07_STIG.zip

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-6b., CAT|II, CCI|CCI-000366, Rule-ID|SV-239184r816674_rule, STIG-ID|PHTN-67-000113, Vuln-ID|V-239184

Plugin: Unix

Control ID: 703a241b8b0f8bd7f34e97d1daaeaa9a3c61c62985f652e854f6b41fb78c0dc3