Common Vulnerabilities and attack methods in Web Applications

Today, with the rapid evolution of Web technology and the vigorous development of e-commerce, many new applications developed by enterprises are Web applications, in addition, Web services are increasingly used to integrate or interact with Web applications. These trends bring about the following problems: the growth of Web applications and services has exceeded the security training and security awareness received by program developers. The security risks of web application systems have reached an unprecedented level. This article analyzes common vulnerabilities and attack methods in Web applications in detail, and comprehensively analyzes the security risks of web application systems.

A Web application system consists of an operating system and a web application. Many programmers do not know how to develop secure applications. They have not been trained in security coding. Their experience may be the development of stand-alone applications or enterprise Web applications that do not consider catastrophic consequences when security defects are exploited.

Most security problems of Web applications belong to one of the following three types:

◆ The server provides services that should not be provided to the public, resulting in security risks.

◆ The server places private data in a publicly accessible area, resulting in leakage of sensitive information.

◆ The server trusts data from untrusted data sources, resulting in attacks.

Many web server administrators have never looked at their servers from another perspective, and have not checked the server's security risks, such as using port scanning programs for system risk analysis. If they did this, they would not run so many services on their own systems, and these services would not have to run on machines that officially provide Web Services, or these services do not need to be open to the public. In addition, they did not modify the banner information of the application that provides external services, so that attackers can easily obtain the version information of the application that the Web server provides external services, find the corresponding attack methods and programs based on the information.

Many Web applications are vulnerable to attacks through servers, applications, and internally developed code. These attacks bypass the Perimeter Firewall security measures because ports 80 or 443 (SSL, secure socket protocol layer) must be open for normal operation of applications. Web Application Security includes illegal input, invalid access control, invalid account and thread management, cross-site scripting attacks, buffer overflow, injection attacks, Exception error handling, insecure storage, and rejection. service Attacks and insecure configuration management. Web application attacks include DoS attacks on applications, modifying web content, SQL injection, uploading webshells, and obtaining control permissions on Web Services.

In short, Web application attacks are different from other attacks because they are difficult to discover and may come from any online users, or even verified users. Web application attacks can bypass the protection of firewalls and intrusion detection products, and enterprise users cannot discover existing web security problems. Of course, enterprises can purchase the web application penetration evaluation service of the Integrity Network Security team to check web Application Security. Integrity Network Security provides professional web penetration assessment security services, comprehensively analyzes web application vulnerabilities, and provides corresponding solutions.

Related Articles]

• How to defend against Web security?

• How far is the Web security product from our needs?