Scanning heartbleed bug with the nmap NSE script
Heartbleed Bug: OpenSSL Security Flaw leaves secure-protocol services using OpenSSL 1.0.1 vulnerable. Administrators using OpenSSL need to check their systems.
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Heartbleed Bug: OpenSSL Security Flaw
Security researchers discovered Heartbleed (CVE-2014-0160), a bug in OpenSSL 1.0.1 through 1.0.1f and 1.0.2beta that can expose memory contents.
Preventing thwart SSH attacks with DenyHosts
Soon after a server connects to the Internet, people begin trying to log in over SSH. If root login is allowed and the password is easy, the server may be compromised.
How to save/restore and backup iptables rules
Today I will cover a simple topic for anyone unfamiliar with the commands for saving, backing up, and restoring iptables rules. This article does not cover the iptables GUI. One problem with Linux iptables is that restarting…
How to install ClamAV on CentOS 5 (RHEL 5)
ClamAV is an open source antivirus widely used on Linux and Unix. This free antivirus integrates well with services and offers flexible configuration.
Free Antivirus 2011: Antivirus Software You Do Not Need to Buy from a Vendor
Antivirus 2011 Free: A list of free antivirus software for 2011 to download without buying from an antivirus vendor. Antivirus is essential for Windows computers…
How to Disable Firewall on Red Hat Enterprise Linux, Centos
Red Hat Enterprise's firewall uses iptables, like other Linux distributions such as CentOS, Debian, SUSE, and Ubuntu. To enable or disable the firewall in Red Hat…
Set passwords policy against a dictionary
Linux provides a module for password policy that prevents users from choosing easily guessed passwords. It is the pam_cracklib.so module in PAM.
Configure the shell to logout automatically after a period of idle time.
On systems with many users, users who leave without logging out waste system resources. This method addresses that and also improves security…
Telnet as the root user
Telnet is usually disabled on Linux for security reasons. This article describes enabling direct root login through telnet.