Skip to main content

Cross Site SQL Injection (XSSQLI)

While going through a nice paper written by Cesar Cerrudo on 'Hacking Intranet with IE', I found an interesting term XSSQLI. Though it's not a new vulnerability,it's a combination of two attacks. Details:
XSSQLI is a term to describe a Cross Site Request Forgery (XSRF) + SQL Injection attack. This
attack consists in forcing a user to request a web application URL that will exploit a SQL
Injection vulnerability, as XSRF attacks the user can be forced to request a URL by using a
HTML IMG, FRAME, IFRAME, STYLE, etc. tag :
img src="”http://intranetsite/pagevulnerable?id="';"

When a victim browses a web page with the above HTML code an automatic request will be
made to “intranetsite” web application without the user noticing it. The difference with a classic
XSRF attack is that instead of the URL requested triggering some action in the target web
application it will exploit SQL Injection.

Within Intranets, some web applications implementations use Windows integrated authentication, this means that the user authenticates to the web application with his Windows credentials, which is done automatically by IE because of “Automatic logon only in Intranet zone” security setting. MS SQL Server (other DBMS could be attacked in this way too) also authenticate users with Windows integrated authentication, some web applications are configured to access SQL Server backend database authenticating with the current Windows user that's accessing the web application. If an
attacker exploits a SQL Injection vulnerability in this kind of web application isn't as valuable as other attack paths since the attacker could directly connect to SQL Server and run SQL statements as far his permissions allows him but by using XSSQLI in order to attack, for instance a SQL Server DBA, the attacker will be able to elevate privileges running SQL Server statements with DBA permissions.
Reference:http://www.argeniss.com/research/HackingIntranets.pdf

Comments

Post a Comment

Popular posts from this blog

Using an AirPcap device in Windows with Wireshark

Capturing wireless traffic in a Windows environment is unfortunately not as easy as a setting change. As with most Windows-based software, drivers in Windows are often not open source and do not allow for configuration change into monitor mode. With this in mind, we must use a specialized piece of hardware known as an AirPcap device. Once you have obtained an AirPcap device you will be required to install the software on the accompanying CD to your analysis computer. The configurable options include: • Interface - Select the device you are using for your capture here. Some advanced analysis scenarios may require you to use more than one AirPcap device to sniff simultaneously on multiple channels. • Blink LED - Clicking this button will make the LED lights on the AirPcap device blink. This is primarily used to identify the specific adapter you are using if you are using multiple AirPcap devices. • Channel - In this field, you select the channel you want AirPcap to listen on. Extension C...
5 comments
Read more

Some one watching where you visited!

Yes... Mozilla has been susceptible to browser-history stealing java script code. Today, Giorgio posted some cool information about the exploit. Mozilla is already working on this. This bug has been reported. Actually they have set up a web site to show the proof-of-concept. Visit www.statrpanic.com in FF,Safari or Netscape and it will tell you which websites have you been already ! But I am not sure it will work in IE or not because my IE is not responding to the website. Clearing history of visited website makes you safe to this attack. I mean this is one way..may be there are other ways to exploit this. But I have found this effective. Try it yourself in FF and then in IE and see the results.
Post a Comment
Read more

Hijacking SSL

SSL has been in centerstage of researches as well as attacks for quite long time. Last year in a conference in Germany researchers showed how to generate duplicate certificates exploiting MD5 hashing to break SSL. Later in Black Hat, Maxie showed how to exploit a field in SSL certificates to sign an own forged certificate to present it to the client. The main feature of this attack was that the client will never get any warning dialog box by the browser and subsequently the hacker doing an MITM can see the conversation between the client and server. The client will even get a PADLOCK sign to be assured that all things are going via encryption, but in reality it's not. Maxie released a tool SSLStrip to carry out these attacks. The tool has been used by many researchers around the world to carry out the attacks. They all used Unix machines as many open source utilities makes it easier to run the tool on it. My attempt was to run the tool on a Windows machine. It has been never easy t...
4 comments
Read more