The Mirai Botnet and My Old Advice

Security expert and writer Brian Krebs was the victim of a distributed denial of service attack that used the Mirai botnet. His site discusses the source code used on the compromised computers. Others have provided analysis of the code. The software is used to infect Internet of Things or IoT devices. Examples include webcams, DVRs, […]
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Can You Withstand a Denial-of-Service (DDOS) Attack?

Several Government of Canada servers were recently knocked off the Internet as described in this Globalnews.ca story. Targets included canada.ca, sencanada.ca, justice.gc.ca, and csis.gc.ca. The story captions a video with a reference to government servers “being hacked”, but that implies an intrusion. It wasn’t an intrusion, it was a denial-of-service attack. A flood of traffic […]
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Patch Bash Now, Shellshock Exploits Are Widespread

I was recently doing some work at a Major Financial Institution when I overheard two systems engineers comparing notes: “I have to install that Bash shell patch on my servers by the end of next month.” “Hah! My servers don’t have to have it until the end of the month after that! Guys, please. Patch […]
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New Attacks on Old Vulnerabilities

Over the last few weeks we (Adrian Bryan and I, the authors and Bob Cromwell, the Technical Editor) have been revising Learning Tree Course 468, System and Network Security Introduction. That is a time-consuming process that Learning Tree authors perform at least once a year. One of the major tasks for 468 is to make […]
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NTP Reflection and DDoS

Let’s say a company runs a promotion for a free can of soup. And let’s say that 1000 of your friends decide to send the soup company your address instead of theirs. You would likely get 1000 cans of soup! Now consider that 10,000 people decided to use your address for their free soup… Unless […]
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