WordPress Database Security: The Prefix Guessing Game

By default, all WordPress database tables’ names start with the prefix “wp_” as shown in the screen shot below.

If a malicious user discovers a zero day SQL injection vulnerability in WordPress (which does happen from time to time), unless you rename the WordPress database table prefixes to something else, the malicious user can easily guess the WordPress database table names and exploit the vulnerability against your blog or website.  To make things worse, there are a myriad of scripts and automated scanners available on the internet that specifically scan and target WordPress blogs and websites. If a malicious user exploits such vulnerability against your blog or website, he can:

1. Gain administrative access to your blog.
2. Tamper your blog and website.
3. Gain access to other sensitive databases on that server.
4. Gain administrative access to your web server.

Therefore by renaming the WordPress database table prefixes, you are automatically enforcing your WordPress database security against such dangerous attacks because the attacker would not be able to guess the table names. We recommend to use difficult to guess prefixes, like long random strings which include both letters and numbers.

WP Security Scan is a WordPress security plugin by WebsiteDefender featuring a tool to help you automate this process. Alternatively you can manually change your WordPress database table prefixes manually by following this step by step guide; How to manually change WordPress database table name prefix.

source : websitedefender.com

Many of us have a proud history of involvement in the UNIX operating system well before the emergence of Linux. To the UNIX world, Ritchie and Thompson were as influential as Linus Torvalds is today to the Linux community. Unix and C’s direct and spiritual descendants cannot be counted, but include Linux, Android, Mac OS, iOS, JavaScript, C++, the genius of the internet, and a planet of developers. The major impact of UNIX is not so much in the elegant code itself but rather in the culture of sharing work across industry and academia that became UNIX’s hallmark. Prior to UNIX, operating system code was locked in corporate vaults – inaccessible to the masses. UNIX flung open these doors by allowing code to be shared among software engineers across the nascent computer industry, ushering in an unprecedented wave of collaborative development – and, at the same time, liberating many applications from being locked into a single proprietary hardware vendor.

UNIX code was also shared with universities where it became the foundation of the learning and advancement of operating system practices. Similarly, the C programming language became a staple of the computer science classroom. Many of us literally grew up in Dennis’ technical shadow and still have his book, The C Programming Language, co-authored with Brian Kernighan and more fondly referred to as K & R, on our shelves. It remains a source of inspiration and practical help to programmers to this day.

Most of what we do is heavily influenced by Dennis’s outstanding contributions – both in the technical arena and as a founder of the concept of community development. We at Red Hat look with awe and reverence on his legacy.

source : http://www.redhat.com/about/news/blog/red-hat-takes-its-hat-off-to-dennis-ritchie

 ,  dennis ritchie

Skype is a little piece of software that lets you make free calls to anyone else on Skype, anywhere in the world. And even though the calls are free, they are really excellent quality.

Make free Skype-to-Skype calls to anyone else, anywhere in the world. * Call phones and mobiles at pretty cheap rates per minute. * Group chat with up to 100 people or conference call with up to nine others. * Free to download.

How To Install Skype On Ubuntu 11.10

 ,  skype calls

Although There’re many ways to download YouTube videos in Ubuntu but here some most easy and convenient techniques are explained – such as using minitube (A native desktop client for YouTube), Terminal and Browser plugins/add-ons. Choose any one – which suits you best.

YouTube Downloader for Ubuntu 11.10

1. Minitube

Minitube is one of the best and cool application – for watching YouTube videos (without Ads? Yeah!) from Desktop, and of course for downloading videos. it’s very simple and easy to use – the GUI is also very good, tends to provide TV like experience. MiniTube has a lot of features and options to configure some things like – video size, related videos in left etc. Minitube is a cross-platform open source software (available in GPL, project is hosted at gitorius) – available free of cost for Linux based Operating System such as Ubuntu (although you’ve to pay if you want to use it on Windows/Mac). You can easily search the youtube videos using keyword or channel name.
How to Install Minitube on Ubuntu 11.10

Minitube is available in official package repository so install Minitube, simply Open Ubuntu Software Center and search for ‘minitube’; click install..and you’re done! Or use terminal (Ctrl+Alt+t) to install Minitube -

sudo apt-get install minitube

How to download videos using MiniTube

it’s pretty simple, first play the video (you want to download), then click on Video -> Download and you’re done! The downloading process will be started, and by default the videos will be saved to /home/Videos. Then you will immediately notice a download section(link) in bottom, click on that for more information about the download (look at the snapshot).

2. Browsers Add-ons/Extensions

If you surf a lot and spends a lot of time with web browsers such as Firefox or Google Chrome then you might want to download YouTube videos, right from the browser (while playing videos).

Extension for Chrome Users : 

There is an extension called ‘YouTube Downloader’, developed by YouTube and Chrome Team (Google Inc). it will allow you save YouTube videos in three formats – mp4, mp3 and FLV.

Download/Install YouTube Downloader in Chrome

Add-on For Firefox Users

it’s a very similar plugin(as above) and there are many options to download videos in multiple formats with a single click.

Download Youtube Downloader for Firefox

3. Terminal

To download videos from command line – first install a utility – youtube-dl. Open terminal and execute -

sudo apt-get install youtube-dl

Now, open the video in browser and copy the URL from the address bar. Then execute the following command -

youtube-dl "URL_you_have_copied"

That’s All.. Let me know your opinion through comment.

(Source : http://blog.sudobits.com)

 ,  utube ripper ubuntu 11 10

Linux Ubuntu : HOW TO merge or split mp3 files

To merge two or more mp3 you will need to get the program called mp3wrap. To split two files you can use program called mp3splt. You can install them by typing:

sudo apt-get install mp3wrap mp3splt

Now you can merge two mp3 files (let’s say 1.mp3 and 2.mp3) by typing:

mp3wrap merged.mp3 2.mp3 1.mp3

note that the merged.mp3 will start with 2.mp3 and finish with 1.mp3

You can split mp3′s now by typing:

mp3splt merged.mp3 0.0 1.2 3.4

this will split file merged.mp3 into two parts:

00:00 – 01:02
01:02 – 03:04

where xx:xx represents minutes:seconds.

If you have problems splitting files merged with mp3wrap delete whatever mp3wrap add to filename and then try again. You shouldn’t experience any problems now.

To see more info on these commands type

man mp3wrap

or

man mp3splt

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gksu gedit /etc/lightdm/unity-greeter.conf

Find the similar line:

background=/PATH/TO/Login/Background

Change the path to any image as you like.

(Source : http://ubuntuguide.net/)

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When I first time using Gnome 3, I didn’t find shutdown/restart button anywhere. I shut down and reboot my machine via command in terminal. You might get the same problem if you’re new to gnome-shell. And here’s a tip to figure it out:

Click on the user account at top-right corner. And press down Alt key, you’ll see the downmost option “Suspend” becomes “Power Off…”.

Click on it and you’ll see shutdown/restart options.

(Source : http://ubuntuguide.net)

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Linux Ubuntu

Is there any difference between a “normal install” and a “WUBI-install” other than that the two operating systems share the same file space? Are there any disadvantages with the WUBI-install?

Answer : “Ubuntu ifference between WUBI and normal install ”

Well, in fact it should do the same job first.

But when it comes to major updates (distro upgrades) it often ends up in non booting situation.  Also sooner or later you might want need more space then allocated at the wubi install and then things can also get complicated.

As all is basically stored in one or two big files, the installation can be kind of fragile as damage to one such file makes the install complete damaged, while on a real partition installation one damaged file might not be a big problem yet.

The wubi was meant for initial test, just to see how does it look like etc, but for long time use it is not very suitable I think.

My wubi installs seldom survived distribution upgrade.

Disadvantages :

No hibernation
30 Gb partition limitation .
Dependent on Windows (Dead Windows = Dead Ubuntu)

It is possible to increase space or move a Wubi installation to a partition , but I would consider these as last resorts unless you have no other installation options .

(Source : http://ubuntuforums.org)

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Microphone problem

My upgrade to Linux Ubuntu 10.04 went very well (previously 9.04), except for my microphone (I have an HP 8530 w elitebook). Sound plays perfectly, and I can hear myself typing and speaking (i.e. the internal microphone loops back to the speakers) but it never works for skype/ audacity / etc.). Everything worked perfectly in 9.04.

I tried many fixes for microphone problems posted here, to no avail. I played around with pavucontrols and alsamixer, tried many suggested options in modrpobe/alsa.conf, and made sure that nothing is muted. pavucontrols shows only one input device instead of two (my internal microphone and the microphone jacks for an external one), and an external microphone somehow works, but way too silent (I can hear a lot of static hiss and my own voice very silently in an external microphone).

Answer :

Finally fixed: After trying different options for two days, I simply purged PulseAudio from my system, and replaced it with esound using “Howto solve all PulseAudio-related issues in Ubuntu” Everything worked fine again without additional tuning.

(source : ubuntuforums.org)

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PDFEdit :

About the project
PDFedit is free and open source library for manipulating PDF documents, released under terms of GNU GPL version 2. It includes PDF manipulating library based on xpdf, GUI and set of command line tools.

Library
Multiplatform library working on Unix systems, Windows32/64 and also Windows CE and others. You can use it to read, change and extract information from a PDF file. It is based on xpdf library.

Tools
Tools include example usage of the library which proved to be useful.

GUI
Graphical interface based on QT3.x which heavily depends on scripting; therefore, any user can modify the behaviour by scripts and plugins. There is also a beta version of QT4.x based windows pdf editor.

Download PDFedit

 ,  qt4 open pdf files