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If ping is returning an unwanted IP address for a domain, it almost certainly means something is hijacking your DNS settings. The first step to check would be the hosts file /etc/hosts Then look here to determine what server or process is resolving your DNS /etc/resolv.conf Alternatively, you can use this command scutil --dns Firefox may be working ...


3

I believe that I'm now safe from all phishing and pharming attempts. Since only few CAs can issue such "green bar" extended validation (EV) certificates you are mostly right if you trust EV certificates. It might still be possible that the CA got hacked, like done with Comodo and DigiNotar in 2011. It is not possible for an attacker to just add a new CA ...


4

It's possible but highly unlikely: An attacker could have created a fake certificate based on compromising a CA certificate or reverse-engineering an valid one. These are both believed difficult, which is why the system is believed secure, but they have happened before. Typically, once the extent of the compromise is known, your OS or browser developers ...



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