| XSS Injection (Cross Site Scripting Vulnerability) is an attack technique used to exploit websites that use dynamic content from the client side. |
| There are two types of XSS attacks: |
| Reflected Cross Site Scripting Vulnerability |
Reflected XSS Vulnerability occurs when an unknown user is directed to a web application that has XSS vulnerability, by a malicious user. Once the unknown user logs in to the website or application the malicious user's attack is executed and the user’s data is exploited.
The attack is crafted by a series of malicious URL parameters that are sent via a URL. The attacker then sends his malicious URL with the URL parameters to the unknown users. This is typically sent as e-mails, instant messages, blogs or forums, or any other possible methods.
The reflected attack occurs when JavaScript is used to open an e-mail or to browse through a website. Additionally, the attack is typically URL encoded, hex coded, or other common encoding method to try and make the URL appear as a valid link. |
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| Stored Cross Site Scripting Vulnerability |
Stored XSS Vulnerability is a planned attack, it occurs when an attacker stores some malicious links which will be used at a later time by an unknown user. The malicious link is generally stored in a common method like in an application or as links that would be later executed by the unknown user.
The storage method could involve a database, or a wiki, or blog. Basically, the malicious user would store some type of a link that would later be encountered by the user, and cause exploitation of the user’s data. The stored method not only has the provision for incorrect checking for input validation, but also for output validation. Even if data has been sanitized upon input, it should also be checked for in the output process. By checking and validated the output, you could also unearth unknown issues during the input validation process.
There is another method how a Stored XSS Vulnerability can be executed. If a database is shared with other applications, the cross site scripting attack could harm all the applications which use the database. If your system cannot verify the validation of the outputs and inputs of the data stored, your application could still be vulnerable. |
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| Fixing XSS Vulnerabilities |
| We believe that the Stored XSS Vulnerabilities are more dangerous than reflected one. The reason being, the reflected attack is a dynamic attack, while the stored attack can just be set once, which is strategically planned to exploit. Both should be tested for with equal importance and should be fixed. Input validation is very important for fixing Stored and Reflected XSS Vulnerabilities. The developer needs to check all methods of how data could be stored and retrieved and validate the input as it's coming in. Additionally the outputs also need to be verified. Our highly skilled team can help you with your web application security by carefully validating all the methods to store malicious data in your application and by advising effective remedies and solutions to fix XSS vulnerabilities. |
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| Contact Arokia IT for effective solutions of XSS vulnerabilities... |
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