The process of exploiting vulnerabilities in web applications has become very easy, especially for seasoned malicious hacker. When a hacker successfully identifies a security flaw in a web application it puts the business and its developers at risk. There have been many cases where users sensitive data is compromised as a result of a successfully exploited vulnerabilities in web applications.

Nowadays hackers rely mostly on automated tools to exploit vulnerabilities in web applications, hence why hack attacks become a more common occurrence. There are many different type of web application vulnerabilities, but here are the 10 most critical and most exploited ones of 2015. These web application vulnerabilities can be found with automated scanners and rated according to their severity. The web application vulnerabilities that are mentioned below are worth fixing, not only because of their severity but also because of the risks it cases to a business.

1. Injection

You must be aware of this common type of vulnerability, which is the common. Hackers, even script kiddies can easily exploit this vulnerability using automated tools. Injection flaws are not limited to SQL injection only. There are several others such as OS, LDAP and even HTML injection where unstructured data is sent as a query or command. This is one of the most severe web application vulnerabilities all over the internet in 2015. In a “XSS File Injection” attack, hackers injected a remote file into the website. So, they can execute java script on current web page. Researchers analyzed this as a particular technique of these hackers to execute their XSS (Cross-site Scripting) attacks.

2. XSS (Cross- site scripting)



Cross-site scripting issue is not a new vulnerability for any researcher. When an attacker exploits this vulnerability he can inject a malicious script in a website. This weakness affects a user, where the session can be hijacked and the user can be redirected to some malicious website instead of the intended web page. We have seen these attacks happening in numbers on different websites, some of which were quite serious, such as when Cross-site scripting issue is not a new vulnerability for any researcher. When an attacker exploits this vulnerability he can inject a malicious script in a website. This weakness affects a user, where the session can be hijacked and the user can be redirected to some malicious website instead of the intended web page. We have seen these attacks happening in numbers on different websites, some of which were quite serious, such as when attackers managed to gain access to the Apache foundation servers through a XSS . Hence it is not a surprise that XSS web vulnerability is listed on the top section of our list.

3. Using Components with Known Vulnerabilities

This happens when the developer does not take security seriously, or out of neglecting. All the components of the web application should be selected carefully and they should not carry any known vulnerability. Here components means every module that the developer use while he is creating the web application; for example, the framework, libraries and etc.



4. HTTP – Insecure Authentication Scheme

When a web application is using Digest, NTLM and Basic authentication on HTTP instead of HTTPS, it leaves application vulnerable to hacking attacks. The most common issues we have seen in recent past are: i) Information leakage, it occurs when a password transmitted over HTTP. This happens when the hackers intercept the user’s password, before it delivers to the website. The hackers who conduct these attacks are dubbed as (man in the middle), because they are between the user and website all the time. ii) Transmission of users data (DOB,Name, social security number etc.) on a clear-text form. This enables an hacker to intercept the network traffic and steals users data. Iii) The possibility to lock or brute force user accounts.



5. Hidden Files accessible

Another major vulnerability in web application is when a hacker attacks a website and gains access to directories and files which are hidden. Some major vulnerabilities in a websites, which may result in a breach like this are:Crossdomain.xml File, Robots.txt, Google Sitemap and clientaccesspolicy.xml.



6. Sensitive Data accessibility

Sensitive data accessibility occurs when an attacker gains access to sensitive data or even to any backup of sensitive data through a vulnerability in your site. Sensitive data may include the credit card information of your users, private information and other type of important data that is not supposed to go public.



7. Weak or common credentials

When a user uses a commonly used password or even username (in some cases) he becomes vulnerable to attackers. If an attacker breaks or accesses your weak password he not only can access your sites admin panels but also have full control of your web application.



8. Programming errors& Misconfiguration

Misconfiguration is when the entire web application depends on the poorly configured software and may be the programming errors that could allow an attacker to get unauthorized access. Proper analysis of web server and other network based service configuration is important as analyzing the security of the web application itself.

9. Directory Listing

The hacker can see all the files of the system if directory listing is enabled on a web server. This may result in serious data theft, depending on the confidentiality of the data, because a hacker can also download the data from the files if he wants to.



10. Unvalidated Redirects and Forwards