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Security

Security. Khaled Al-Sham’aa. What Is Security?. Security is a measurement, not a characteristic. Security must be balanced with expense. Security must be balanced with usability. Security must be part of the design. Basic Steps. Consider illegitimate uses of your application.

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Security

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  1. Security Khaled Al-Sham’aa

  2. What Is Security? • Security is a measurement, not a characteristic. • Security must be balanced with expense. • Security must be balanced with usability. • Security must be part of the design.

  3. Basic Steps • Consider illegitimate uses of your application. • Educate yourself. • If nothing else: FILTER ALL INPUT DATA ESCAPE ALL OUTPUT DATA

  4. Register Globals (1)

  5. Register Globals (2)

  6. Filtering (1)

  7. Filtering (2)

  8. Filtering (3)

  9. Form Processing (1)

  10. Form Processing (2)

  11. Cross-Site Scripting (XSS)

  12. Cross-Site Scripting (XSS) 1

  13. Cross-Site Scripting (XSS) 2

  14. Cross-Site Scripting (XSS) 3 • htmlentities() • strip_tags() • utf8_decode()

  15. Session Hijacking

  16. SQL Injection (example 1) <form method="post" action="http://www.example.com/login.php"> <input name="user" type="text"> <input name="pwd" type="password"> </form>

  17. SQL Injection (example 1) con. • SELECT `id` FROM `logins` WHERE `username` = '$user' AND `password` = '$pwd' • $user = “Khaled”; • $pwd = “anything' OR 'x'='x”; • SELECT `id` FROM `logins` WHERE `username` = 'Khaled' AND `password` = 'anything' OR 'x'='x'

  18. SQL Injection (example 2) • $query = “UPDATE usertable SET pwd='$pwd' WHERE uid='$uid' ”; • $pwd = “abc”; • $uid = “anything' or uid='admin'; -- ”; • $query = “UPDATE usertable SET pwd='abc' WHERE uid= 'anything' or uid='admin'; -- ' ”;

  19. Avoiding SQL Injection • mysql_real_escape_string() • for PHP version < 4.3.0 use addslashes() • Prepared Statements

  20. Questions

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