Exploiting and defending against top web vulnerabilities

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exploiting and defending against top web vulnerabilities: a detailed tutorial

this tutorial delves into some of the most prevalent web vulnerabilities, demonstrating how they can be exploited and, more importantly, how to defend against them with practical code examples. we will cover the owasp top ten vulnerabilities, focusing on the most impactful and frequently encountered.

*disclaimer:* this information is for educational purposes only. do not attempt to exploit vulnerabilities on systems you do not own or have permission to test. unauthorized access to computer systems is illegal and unethical.

*table of contents:*

1. *injection (a1:2021)*
sql injection (sqli)
cross-site scripting (xss)
command injection
code injection
ldap injection
2. *broken authentication (a2:2021)*
weak credentials
credential stuffing
session management issues
3. *sensitive data exposure (a3:2021)*
weak encryption
data storage issues
data transmission issues
4. *broken access control (a4:2021)*
vertical privilege escalation
horizontal privilege escalation
missing function level access control
5. *security misconfiguration (a5:2021)*
default credentials
unnecessary features enabled
incorrect permissions
6. *vulnerable and outdated components (a6:2021)*
using known vulnerable libraries
lack of patching
7. *identification and authentication failures (a7:2021)*
8. *software and data integrity failures (a8:2021)*
9. *security logging and monitoring failures (a9:2021)*
10. *server-side request forgery (ssrf) (a10:2021)*

*1. injection (a1:2021)*

injection flaws occur when user-supplied data is incorporated into a query, command, or other part of the application without proper validation and sanitization. this allows attackers to inject malicious code that the application executes.

*a) sql injection (sqli)*

*explanation:* sqli allows attacke ...

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cross-site scripting defense
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