Archive for the ‘Linux’ category

Symantec website got hacked

November 27th, 2009

A self-proclaimed grey-hat hacker has located a critical SQL injection vulnerability in a website belonging to security giant Symantec. The flaw can be leveraged to extract a wealth of information from the database including customer and admin login credentials, product serial numbers, and possibly credit card information.

The flaw was found by a Romanian hacker going by the online handle of Unu, according to whom an insecure parameter of a script from the pcd.symantec.com website, allows for a blind SQL injection (SQLi) attack to be performed. In such an attack, the hacker obtains read and/or write permission to the underlying database of the vulnerable website.

symantec » Read more: Symantec website got hacked

Popularity: 41% [?]

How to restrict access into Wordpress Dashboard via IP address

November 24th, 2009

Have you ever wonder how to restrict your Wordpress Dashboard login via IP address or IP ranges? You could possibly would like to refrain some user from accessing your Wordpress application especially WPMU where it is shared by multi users from all over the world.

Just create a .htaccess file and put it on your wp-admin folder and add below syntax as example below.

allow from “IP address or IP ranges”

The IP ranges added are the IP address that is allow to access the wp-admin folder or the Wordpress Dashboard.

———————————

<Limit GET HEAD POST>
order deny,allow
allow from
192.168.1.0/24
allow from
192.169.1.0/24
deny from all
</LIMIT>

———————————

Give it a try and have fun :D

Popularity: 100% [?]

Wordpress 2.8 image upload error fix

November 17th, 2009

Ever encountered the error like below screen? Unable to create directory to your /filepath/wp-content/uploads . Is its parent directory writable by the server?

imageerror

You probably has just migrated your Wordpress from another server to an new server. Now here’s how to fix it.

Go to your Wordress Dashboard Settings -> Miscellaneous Settings

Then and change the value is there in for: Store uploads in this folder to wp-content/uploads ( default upload filepath)

Save Changes and Done. And try upload your image like you always used to. Good luck :)

Popularity: 8% [?]

Google Chrome OS set to launch next week!!!

November 14th, 2009

52214v13-max-250x250Google’s Chrome OS project, first announced in July, will become available for download within a week, we’ve heard from a reliable source. Google previously said to expect an early version of the OS in the fall.

Google Chrome OS is a PC operating system. Announced on July 7, 2009, the operating system will be open source and targeted at netbooks. Later this year we will open-source its code, and netbooks running Google Chrome OS will be available for consumers in the second half of 2010. Because we’re already talking to partners about the project, and we’ll soon be working with the open source community, we wanted to share our vision now so everyone understands what we are trying to achieve.

Speed, simplicity and security are the key aspects of Google Chrome OS. We’re designing the OS to be fast and lightweight, to start up and get you onto the web in a few seconds. The user interface is minimal to stay out of your way, and most of the user experience takes place on the web. And as we did for the Google Chrome browser, we are going back to the basics and completely redesigning the underlying security architecture of the OS so that users don’t have to deal with viruses, malware and security updates. It should just work.

Google Chrome OS will run on both x86 as well as ARM chips and we are working with multiple OEMs to bring a number of netbooks to market next year. The software architecture is simple — Google Chrome running within a new windowing system on top of a Linux kernel. For application developers, the web is the platform. All web-based applications will automatically work and new applications can be written using your favorite web technologies. And of course, these apps will run not only on Google Chrome OS, but on any standards-based browser on Windows, Mac and Linux thereby giving developers the largest user base of any platform.

Google Chrome OS is a new project, separate from Android. Android was designed from the beginning to work across a variety of devices from phones to set-top boxes to netbooks. Google Chrome OS is being created for people who spend most of their time on the web, and is being designed to power computers ranging from small netbooks to full-size desktop systems. While there are areas where Google Chrome OS and Android overlap, we believe choice will drive innovation for the benefit of everyone, including Google.

Popularity: 76% [?]

SpamAssassin Global Domain email whitelist.

November 2nd, 2009

Go to /etc/mail/spamassassin/

Then pico or vi local.cf and add the entry as below if you would like to whitelist the domain from domain.com

whitelist_from *domain.com

Restart exim. Done.

Popularity: 4% [?]

The World of Command Line – Linux

June 30th, 2009

THE FILE SYSTEM

In Linux system, everything is a file. A picture, an MP3 song, a text file, is a file.

What about directories? A folder would be more familiar name for directory. And guess what, a directories, sub directories and sub-sub directories and etc too are a type of file. It is just a type of special files that contains other file information.

Even the network connection are files and every processes running in the system are files.

CASE SENSITIVE SURROUNDINGS

In Linux world, every files must be unique and every name of the files are case sensitive. For example;

“ThisIsAFile.txt” is completely different from “thisisafile.txt”

Case-sentivity means every commands and filenames must be entered correctly or it may result in different outcome that you does not wish it to happen. For example;

$rm thisisafile.txt

The command above only remove the file with name thisisafile.txt and you can’t use RM, rM or Rm for the command. (rm stands for remove by the way)

Popularity: 3% [?]

552 Message size exceeds maximum permitted

March 15th, 2009

If your sender encountered such error messages in the bounced mail error as below
=================================================
From: Mail Delivery System
Sent: Sender
To: Recipient
Subject: Mail delivery failed: returning message to sender

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

username@domain.com
SMTP error from remote mail server after MAIL FROM: SIZE=5000000:
host mail.domain.com [192.168.1.1]: 552 Message size exceeds maximum permitted
================================================

Go to /etc and view the exim.conf files.

> pico /etc/exim.conf

Search for “message_size_limit” and change the limit from 5M to larger size.

—————————-

message_size_limit = 5M

—————————-

And finally, save it and restart Exim services. Done.

Popularity: 8% [?]

Get Adobe Flash playerPlugin by wpburn.com wordpress themes