Type chrome://net-internals/#hsts in the address bar of chrome
Query domain: if it appears as a result, it is HSTS enabled
Open file explorer
Copy paste %APPDATA%\Mozilla\Firefox\Profiles\ in the address bar of file explorer (for Linux it is ~/.mozilla/firefox)
Double click the folder you see (if you have multiple FF profiles, there will be multiple folders)
Open SiteSecurityServiceState.txt. This textfile contains sites that have enabled HSTS.
What is the difference between the NVD and the Common Vulnerabilities and Exposures (CVE) standard vulnerability dictionary?
The NVD is the CVE dictionary augmented with additional analysis, a database, and a fine-grained search engine. The NVD is a superset of CVE. The NVD is synchronized with CVE such that any updates to CVE appear immediately on the NVD.
La raison pour laquelle on voit des block en OUPUT de certains type ICMP dans les scripts iptables :
Scanning for open UDP ports is done with the -sU option. With this scan type, Nmap sends 0-byte UDP packets to each target port on the victim. Receipt of an ICMP Port Unreachable message signifies the port is closed, otherwise it is assumed open.
One major problem with this technique is that, when a firewall blocks outgoing ICMP Port Unreachable messages, the port will appear open. These false-positives are hard to distinguish from real open ports.