Explain in detail the frequently occurring web application security vulnerabilities

Web application security vulnerabilities. We usually know very little about this issue. We don’t even know which vulnerabilities are there. Today this tutorial teaches you a lesson and takes stock of common web applications. Security vulnerabilities, I hope everyone can go and see, long-term insight.

Today, with the rapid evolution of Internet popularity and Web technologies, the challenges of online security are becoming more and more serious. With the increase in the availability of online information and services, and the growth of attacks and disruptions on the Web, security risks have reached unprecedented heights. Because many security efforts are concentrated on the network itself, web applications are almost forgotten. Perhaps this is because the application used to be a stand-alone program running on a single computer. If the computer is secure, then the application is safe. Today, the situation is quite different, with web applications running on many different machines: client, web server, database server, and application server. And because they are generally available to everyone, these applications are the background bypass for many attacks.

Since the web server provides several different ways to forward requests to the application server and send modified or new web pages back to the end user, it makes it easier to break into the network.

Moreover, many programmers don't know how to develop secure applications. Their experience may be to develop stand-alone applications or intranet Web applications that do not take into account the potentially catastrophic consequences of exploiting security flaws.

Second, many web applications are vulnerable to attacks from servers, applications, and internally developed code. These attacks go directly through perimeter firewall security because port 80 or 443 (SSL, Secure Sockets Layer) must be open for the application to function properly. Web application attacks include DoS (Denial of Service) attacks on the application itself, changes to web content, and theft of key information or user information about the enterprise.

In short, web application attacks are different from other attacks because they are hard to find and may come from any online user or even a verified user. To date, this aspect has not received much attention because enterprise users primarily use firewalls and intrusion detection solutions to secure their networks, while firewalls and intrusion detection solutions fail to detect Web attacks.

Common Web Application Security Vulnerabilities

Below is a list of commonly occurring security vulnerabilities and a brief explanation of how these vulnerabilities are generated.

Known Weaknesses and Misconfigurations

Known vulnerabilities include all operating system errors in the operating system and third-party applications used by web applications or vulnerabilities that can be exploited. This issue also involves misconfiguration, including unsafe default settings or applications that the administrator does not have for security configuration. A good example is that your web server is configured to allow any user to pass through any directory path on the system, which can lead to the disclosure of sensitive information stored on the web server, such as passwords, source code or customer information. .

Hidden Fields

In many applications, hidden HTML format fields are used to store system passwords or item prices. Despite its name, these fields are not very subtle, and anyone who performs “view source code' on a web page can see it. Many web applications allow malicious users to modify these fields in the HTML source file, giving them the opportunity to purchase goods at minimal or no cost. These attacks were successful because most applications did not validate the returned pages; instead, they considered the input data and output data to be the same.

Backdoor and Debug Vulnerabilities

Developers often build backdoors and rely on debugging to troubleshoot applications. This can be done during the development process, but these security vulnerabilities are often left in some final applications on the Internet. Some common backdoors allow users to log in or access a special URL that allows direct application configuration without a password.