Monday, May 16, 2011
Anu
We hear the same terms bandied about whenever a popular site gets hacked. You know… SQL
Injection, cross site scripting, that kind of thing. But what do these
things mean? Is hacking really as inaccessible as many of us imagine — a
nefarious, impossibly technical twilight world forever beyond our ken?
Not really.
When
you consider that you can go to Google right now and enter a search
string which will return you thousands of usernames and passwords to
websites, you realize that this dark science is really no mystery at
all. You'll react similarly when you see just how simple a concept SQL
Injection is, and how it can be automated with simple tools. Read on,
to learn the basics of how sites and web content management systems are
most often hacked, and what you can do to reduce the risk of it
happening to you.
SQL Injection
SQL Injection involves entering SQL code
into web forms, eg. login fields, or into the browser address field, to
access and manipulate the database behind the site, system or
application.
When you enter text in the Username and Password fields of a login screen, the data you input is typically inserted into an SQL command.
This command checks the data you've entered against the relevant table
in the database. If your input matches table/row data, you're granted
access (in the case of a login screen). If not, you're knocked back out.
The Simple SQL Injection Hack
In its simplest form, this is how the SQL
Injection works. It's impossible to explain this without reverting to
code for just a moment. Don't worry, it will all be over soon.
Suppose we enter the following string in a Username field:
' OR 1=1
The authorization SQL query that is run by the server, the command which must be satisfied to allow access, will be something along the lines of:
SELECT * FROM users WHERE username = ?USRTEXT '
AND password = ?PASSTEXT?
…where USRTEXT and PASSTEXT are what the user enters in the login fields of the web form.
So entering `OR 1=1 — as your username, could result in the following actually being run:
SELECT * FROM users WHERE username = ?' OR 1=1 — 'AND password = '?
Two things you need to know about this:
['] closes the [username] text field.
['] closes the [username] text field.
'' is the SQL convention for Commenting code, and everything after Comment is ignored. So the actual routine now becomes:
' is the SQL convention for Commenting code, and everything after Comment is ignored. So the actual routine now becomes:SELECT * FROM users WHERE username = '' OR 1=1
1 is always equal to 1, last time I checked. So the authorization
routine is now validated, and we are ushered in the front door to wreck
havoc.
Let's hope you got the gist of that, and move briskly on.
Brilliant! I'm gonna go hack me a Bank!
Slow down, cowboy. This half-cooked method won't beat the systems they have in place up at Citibank, evidently.
But the process does serve to illustrate just what SQL Injection is all about — injecting code to manipulate a routine via a form, or indeed via the URL. In terms of login bypass via Injection, the hoary old ' OR 1=1
is just one option. If a hacker thinks a site is vulnerable, there are
cheat-sheets all over the web for login strings which can gain access to
weak systems. Here are a couple more common strings which are used to
dupe SQL validation routines:
username field examples:
- admin'—
- ') or ('a'='a
- ”) or (“a”=”a
- hi” or “a”=”a
… and so on.
Backdoor Injection- Modules, Forums, Search etc.
Hacking web forms is by no means limited exclusively to login screens. A humble search form, for instance, is necessarily tied to a database, and can potentially be used to amend database details. Using SQL commands in search forms can potentially do some extremely powerful things, like calling up usernames and passwords, searching the database field set and field names, and amending same. Do people really get hacked through their search forms? You better believe it. And through forums, and anywhere else a user can input text into a field which interacts with the database. If security is low enough, the hacker can probe the database to get names of fields, then use commands like INSERT INTO, UNION, and so forth to get user information, change product prices, change account settings/balances, and just about anything else… depending on the security measures in place, database architecture and so on.
Hacking web forms is by no means limited exclusively to login screens. A humble search form, for instance, is necessarily tied to a database, and can potentially be used to amend database details. Using SQL commands in search forms can potentially do some extremely powerful things, like calling up usernames and passwords, searching the database field set and field names, and amending same. Do people really get hacked through their search forms? You better believe it. And through forums, and anywhere else a user can input text into a field which interacts with the database. If security is low enough, the hacker can probe the database to get names of fields, then use commands like INSERT INTO, UNION, and so forth to get user information, change product prices, change account settings/balances, and just about anything else… depending on the security measures in place, database architecture and so on.
So you can have security locked down at the login, but poor security
on other forms can still be exploited. Unfortunately this is a real
worry regarding 3rd party modules for Web CMS products which incorporate forms, and for CMS products these 3rd party modules are often the weakest links which allows hackers access to your database.
Automated Injection
There are tools to automate the process of SQL Injection into login and other fields. One hacker process, using a specific tool, will be to seek out a number of weak targets using Google (searching for login.asp, for instance), then insert a range of possible injection strings (like those listed above, culled from innumerable Injection cheat-sheets on the Web), add a list of proxies to cover his movements, and go play XBox while the program automates the whole injection process.
There are tools to automate the process of SQL Injection into login and other fields. One hacker process, using a specific tool, will be to seek out a number of weak targets using Google (searching for login.asp, for instance), then insert a range of possible injection strings (like those listed above, culled from innumerable Injection cheat-sheets on the Web), add a list of proxies to cover his movements, and go play XBox while the program automates the whole injection process.
Remote Injection
This involves uploading malicious files to inject SQL and exploit other vulnerabilities. It's a topic which was deemed beyond the scope of this report, but you can view this PDF if you'd like to learn more.
This involves uploading malicious files to inject SQL and exploit other vulnerabilities. It's a topic which was deemed beyond the scope of this report, but you can view this PDF if you'd like to learn more.
SQL Injection in the Browser Address Bar
Injections can also be performed via the browser address bar. I don't mean to have a pop at Microsoft, but when it comes to such vulnerabilities, HTTP GET requests with URLs of the following form are most often held to be vulnerable:
Injections can also be performed via the browser address bar. I don't mean to have a pop at Microsoft, but when it comes to such vulnerabilities, HTTP GET requests with URLs of the following form are most often held to be vulnerable:
http://somesite.com/index.asp?id=10
Try adding an SQL command to the end of a URL string like this, just for kicks:
http://somesite.com/index.asp?id=10 AND id=11
See if both articles come up. Don't shoot your webmaster just yet if
it's your own site and you get two articles popping up: this is real
low-level access to the database. But some such sites will be
vulnerable. Try adding some other simple SQL commands to the end of URLs from your own site, to see what happens.
The database structure can be mapped by a skilled hacker through
ill-conceived visibility of error messages — this is called database
footprinting — and then this knowledge of table names and so forth can
be used to gain access to additional data. Revealing error messages are
manna - they can carry invaluable table name and structural details.
The following illustrative string is from Imperva.
http://www.mydomain.com/products/products.asp?productid=123 UNION SELECT username, password FROM USERS
There are vast swathes of information on SQL Injection available, here are a couple of good sources:
Cross Site Scripting (XSS)
XSS or Cross Site Scripting
is the other major vulnerability which dominates the web hacking
landscape, and is an exceptionally tricky customer which seems
particularly difficult to stop. Microsoft, MySpace, Google… all the big cahunas have had problems with XSS vulnerabilities. This is somewhat more complicated than SQL Injection, and we'll just have a quick look to get a feel for it.
XSS is about malicious (usually) JavaScript
routines embedded in hyperlinks, which are used to hijack sessions,
hijack ads in applications and steal personal information.
Picture the scene: you're there flicking through some nameless
bulletin board because, yes, you really are that lazy at work. Some
friendly girl with broken English implores you to get in touch. 'Me nice
gurl', she says. You've always wondered where those links actually go,
so you say what the hell. You hover over the link, it looks like this in
the information bar:
[%63%61%74%69%6f%6e%3d%274%74%70%3a%2f%2f%77%7…]
Hmmm…what the hell, let's give it a bash, you say. The one thing I
really need right now is to see an ad for cheap Cialis. Maybe the linked
page satisfies this craving, maybe not. Nothing dramatic happens when
you click the link, at any rate, and the long day wears on.
When a link in an IM, email, forum or message board is hexed like the one above, it could contain just about anything. Like this example, from SandSprite,
which helps steal a session cookie, which can potentially be used to
hijack a session in a web application, or even to access user account
details.
Stealing cookies is just the tip of the iceberg though — XSS attacks through links and through embedded code on a page or even a bb post can do a whole lot more, with a little imagination.
XSS is mostly of concern to consumers and
to developers of web applications. It's the family of security
nightmares which keeps people like MySpace Tom and Mark Zuckerberg awake at night. So they're not all bad then, I suppose…
For additional resources on this topic, here's a great overview of XSS (PDF) and just what can be accomplished with sneaky links. And here's an in-depth XSS video.
Authorization Bypass
Authorization Bypass is a frighteningly simple process which can be
employed against poorly designed applications or content management
frameworks. You know how it is… you run a small university and you want
to give the undergraduate students something to do. So they build a
content management framework for the Mickey Bags research department.
Trouble is that this local portal is connected to other more important
campus databases. Next thing you know, there goes the farm
Authorization bypass, to gain access to the Admin backend, can be as simple as this:
- Find weak target login page.
- View source. Copy to notepad.
- Delete the authorization javascript, amend a link or two.
- Save to desktop.
- Open on desktop. Enter anything into login fields, press enter.
- Hey Presto.
Here's a great video of a White Hat going through the authorization-bypass
process on YouTube. This was done against a small university's website.
It's a two-minute process. Note that he gets into the User 1 account,
which is not the Admin account in this case. Is Admin User 1 on your
User table?
Google Hacking
This is by far the easiest hack of all. It really is extraordinary
what you can find in Google's index. And here's Newsflash #1: you can
find a wealth of actual usernames and passwords using search strings.
Copy and paste these into Google:
inurl:passlist.txt
inurl:passwd.txt
…and this one is just priceless…
“login: *” “password= *” filetype:xls
Such strings return very random results, and are of little use for
targeted attacks. Google hacking will primarily be used for finding
sites with vulnerabilities. If a hacker knows that, say, SQL
Server 2000 has certain exploits, and he knows a unique string pushed
out by that version in results, you can hone in on vulnerable websites.
For specific targets Google can return some exceptionally useful
information: full server configurations, database details (so a good
hacker knows what kind of injections might work), and so forth. You can
find any amount of SQL database dumps as well (fooling around with a Google hack while preparing this article, I stumbled across a dump for a top-tier CMS developer's website). And a vast amount more besides.
johnny.ihackstuff.com is
the man to go to for Google hacks. One interesting one I toyed with
invited me to the Joomla! install page for dozens of sites… people who
had uploaded Joomla!, decided against installing it, and subsequently
had either left the domain to rot, or else set a redirect on the page
to, say, their Flickr account (in one case). Allowing anybody to walk in
and run through the installer. Other query strings target unprotected
email/IM archives, and all sorts of very sensitive information. What fun
we can have!
Password Cracking
Hashed strings can often be deciphered through 'brute forcing'. Bad
news, eh? Yes, and particularly if your encrypted passwords/usernames
are floating around in an unprotected file somewhere, and some Google
hacker comes across it.
You might think that just because your password now looks something like XWE42GH64223JHTF6533H in
one of those files, it means that it can't be cracked? Wrong. Tools are
freely available which will decipher a certain proportion of hashed and
similarly encoded passwords.
A Few Defensive Measures
- If you utilize a web content management system, subscribe to the development blog. Update to new versions soon as possible.
- Update all 3rd party modules as a matter of course — any modules incorporating web forms or enabling member file uploads are a potential threat. Module vulnerabilities can offer access to your full database.
- Harden your Web CMS or publishing platform. For example, if you use WordPress, use this guide as a reference.
- If you have an admin login page for your custom built CMS, why not call it 'Flowers.php' or something, instead of “AdminLogin.php” etc.?
- Enter some confusing data into your login fields like the sample Injection strings shown above, and any else which you think might confuse the server. If you get an unusual error message disclosing server-generated code then this may betray vulnerability.
- Do a few Google hacks on your name and your website. Just in case…
- When in doubt, pull the yellow cable out! It won't do you any good, but hey, it rhymes.
Thanks....
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1 comments:
very useful information, thanks for sharing
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