Upgrade Kali Linux 2019.x to Kali Linux 2020.x

For all existing installation of Kali Linux rolling release, you can always do a quick update. But first, ensure you have the official Kali repositories enabled. sudo tee /etc/apt/sources.list<<EOF deb http://http.kali.org/kali kali-rolling main non-free contrib EOF Take note of the current release. $ cat /etc/os-release PRETTY_NAME=”Kali GNU/Linux Rolling” NAME=”Kali GNU/Linux” ID=kali VERSION=”2019.4″ VERSION_ID=”2019.4″ VERSION_CODENAME=”kali-rolling” ID_LIKE=debian Read more about Upgrade Kali Linux 2019.x to Kali Linux 2020.x[…]

Simple Postfix Hardening

ADD TO  /etc/postfix/main.cf vi /etc/postfix/main.cf   # Hardening SSL configuration# # enable opportunistic TLS support in the SMTP server and clientsmtp_tls_security_level = maysmtp_tls_loglevel = 1 # only offer authentication after STARTTLSsmtpd_tls_auth_only = yes # Disable SSL compressiontls_ssl_options = NO_COMPRESSION # Disable SSLv2 and SSLv3 leaving TLSv1, TLSv1.1 and TLSv1.2 enabled.smtpd_tls_mandatory_protocols = !SSLv2, !SSLv3smtpd_tls_protocols = !SSLv2 Read more about Simple Postfix Hardening[…]