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Penetration Testing

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Penetration testing(pentest) is very important for development and production environments unfortunately many people forget that and play with fire.

Pentest is a method of evaluating the security of a server services and hardware devices.
This hard analysis is carried out from the position of a potential attacker, in this case this attacker is a white hat and he can involve active exploitation of security vulnerabilities. [Read more…]

Backup your MBR

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Master Boot Record (MBR), a small program that is executed when a computer boots up.

You can save your MBR with a simple DD-command to a file:

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dd if=/dev/sda count=1 bs=512 > /var/backup/MBR

From this file you can restore your MBR very easy:

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dd if=/var/backup/MBR of=/dev/sdb

RAID1 replace broken HDD

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If you see something like this on your monitor or in your logs, you should worry about your important data.

And immediately change your HDD!

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ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
ata1.00: failed command: FLUSH CACHE EXT
ata1.00: cmd ea/00:00:00:00:00/00:00:00:00:00/a0 tag 0
res 40/00:0c:b9:68:55/00:00:05:00:00/40 Emask 0x4 (timeout)
ata1.00: status: { DRDY }
ata1: hard resetting link
ata1: link is slow to respond, please be patient (ready=0)
ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
ata1.00: configured for UDMA/133
ata1: EH complete

[Read more…]