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Server Security

Hardening your TCP/IP Stack Against SYN Floods

Denial of service (DoS) attacks launch via SYN floods can be very problematic for servers that are not properly configured to handle them. Proper firewall filtering policies are certainly usually the first line of defense, however the Linux kernel can also be hardened against these types of attacks. This type of hardening is useful for SYN floods that attempt to …

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How To Install APF Firewall on Cpanel

Advanced Policy Firewall, or APF, is basically an interface to iptables, which is the standard interface to managing network ports on Linux machines. Interacting with iptables can be complex and error-prone, and APF greatly simplifies working with it. However, APF is still only accessible by ssh. There is no way to make changes in APF through WHM or cPanel. All of the APF configuration files are located in the /etc/apf folder …

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CVE-2014-6271 – Critical BASH vulnerability discovered (Shellshock)

Critical BASH vulnerability discovered – update BASH on your CentOS Linux server!!! ## Shellshock vulnerability ## Summary >> A critical code execution vulnerability (Remote) affecting bash (Unix shell) has been discovered on September 24, 2014. >> The vulnerability occurs because bash does not stop after processing the function definition; it continues to parse and execute shell commands following the function …

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