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Category: Linux

Root password Linux reset in 1 minute

This little trick recently saved me from a critical situation and shows one more time the weakness of every system with unencrypted disks.

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Reverse shell on firewalled server

Sometimes, it may be useful to keep a connection to a server (let’s call it SERVER_1) that is not reachable from the internet because of iptables ingress rules or simply because it doesn’t have a public IP.  You can reach it from another server (let’s name it SERVER_2) that is accessible.

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Vim – Find and replace strings

Vim can be hard to use at the beginning, but when you’re used to it and know a few tricks, it’s impossible to go back to nano, also known as ‘the text editor for kids’.

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IP extraction

Regex are useful to cope with basic unix / linux administration tasks.
To extract IP from file, this simple command do the trick :
grep -o '[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}' /var/log/auth.log 15-08-27 - 16:17:00
11.213.54.142
11.213.54.142
11.213.54.142
11.213.54.142
11.213.54.142
11.213.54.142
11.213.54.142
11.213.54.142
11.213.54.142
11.213.54.142
11.213.54.142
188.216.199.96
188.216.199.96
188.216.199.96
188.216.199.96
188.216.199.96
188.216.199.96
188.216.199.96
188.216.199.96
188.216.199.96
188.216.199.96
188.216.199.96
11.213.54.142
11.213.54.142
11.213.54.142
11.213.54.142
11.213.54.142

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