What vulnerabilities will appear in php?

Vulnerabilities that may appear include cross-site scripting attacks, SQL injection, file inclusion vulnerabilities, code injection vulnerabilities, file upload vulnerabilities, session hijacking, insecure file permissions, etc. Detailed introduction: 1. Cross-site scripting attacks and XSS vulnerabilities are usually caused by improper filtering of user input. In order to prevent XSS vulnerabilities, developers should strictly filter and escape user input to ensure that user input will not be treated as Script execution; 2. SQL injection, usually caused by incorrect filtering of user input or use of unsafe SQL query statements, etc.

The operating system for this tutorial: Windows 10 system, PHP8.1.3 version, Dell G3 computer.

PHP is a widely used server-side scripting language and is widely used in web development. However, due to its openness and flexibility, PHP also has some security vulnerabilities. This article will introduce some common PHP vulnerabilities and how to prevent them.

1. Cross-site scripting attack (XSS): XSS is a common web attack method. Attackers inject malicious scripts into web pages, causing users to execute these scripts when they access the page. XSS vulnerabilities in PHP are often caused by user input not being properly sanitized. In order to prevent XSS vulnerabilities, developers should strictly filter and escape user input to ensure that user input will not be executed as a script.

2. SQL injection: SQL injection is an attack method that uses a web application to execute malicious SQL queries on the database. SQL injection vulnerabilities in PHP are usually caused by improperly sanitizing user input or using unsafe SQL query statements. To prevent SQL injection vulnerabilities, developers should use parameterized queries or prepared statements to ensure that user input is not executed as SQL code.

3. File inclusion vulnerability: The file inclusion vulnerability in PHP is a vulnerability that allows an attacker to execute arbitrary code on the web server. This vulnerability is typically caused by improper validation of user input. In order to prevent files from containing vulnerabilities, developers should strictly verify and filter user input to ensure that users cannot access illegal files.

4. Code injection vulnerability: Code injection is a vulnerability that allows attackers to inject malicious code into web applications. Code injection vulnerabilities in PHP are often caused by not properly sanitizing user input or using unsafe code to execute functions. To prevent code injection vulnerabilities, developers should implement strict validation and filtering of user input and avoid using unsafe code execution functions.

5. File upload vulnerability: The file upload vulnerability in PHP is a vulnerability that allows attackers to upload malicious files to the web server. This vulnerability is typically caused by improper validation of the type and content of uploaded files. To prevent file upload vulnerabilities, developers should strictly verify and filter uploaded files to ensure that only safe file types and content are allowed to be uploaded.

6. Session hijacking: Session hijacking is a vulnerability in which an attacker impersonates a user's identity by stealing user session information. Session hijacking vulnerabilities in PHP are usually caused by not properly protecting session information. To prevent session hijacking vulnerabilities, developers should use secure session management mechanisms, such as using encrypted session IDs, limiting session validity, etc.

7. Insecure file permissions: A file permissions vulnerability in PHP is a vulnerability that allows an attacker to execute malicious code by exploiting the web server's access to files. This vulnerability is usually caused by incorrectly setting file permissions. To prevent file permission vulnerabilities, developers should ensure that only necessary files and directories are writable by the web server, and other files and directories should be set to read-only or with no access.

To summarize, PHP, as a widely used server-side scripting language, has some common security vulnerabilities, such as cross-site scripting attacks, SQL injection, file inclusion vulnerabilities, code injection vulnerabilities, file upload vulnerabilities, session Hijacking and insecure file permissions. To prevent these vulnerabilities, developers should perform strict validation and filtering of user input, use secure code execution functions and query statements, perform strict validation and filtering of file uploads, use secure session management mechanisms, and correctly set file permissions .

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