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A fatal flaw in TCP on Linux hijacks HTTPS connections. Here is the fix If you are running Linux kernel 3.6 or newer, anyone in the world on a network that allows IP spoofing can hijack your encrypted communications in less than a minute, with a success rate of 90%. Here is how to […] Update Your Linux Kernel in Place (Running CentOS 7 or Above) If you started an instance from the official CentOS AMI on AWS, you are running kernel 3.1 as of this writing, while you could easily take advantage of improved security features of newer kernels that are already available in a stable release. Here […] Anti-Spam Defense: Using Postfix With smtpd Access Restrictions Fighting spam, aren’t we all… To stem the tide of unwanted junk mail look no further than the built-in access restrictions in Postfix. If you find yourself the postmaster-in-chief, the last think you want is having to rely on your users to weed through spam and […] |
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