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Web Application Security
Presented by:
Md Syed Ahamad
Detection and Prevention of
SQL Injection
1
Project under:
Dr. Ferdous Ahmed
Project Role
 Theory
 Analysis
 Implementation
CS200Detection and Prevention of SQL Injection
2
Topics
 Introduction
 Webgoat and WebScarab
 Prevention Mechanism and Detection Mechanism
 Methods
 Visual
 Advantage and disadvantage
 Conclusion
CS200Detection and Prevention of SQL Injection
3
Introduction
 Thread Agent – Application Specific
 Attack Vector
 Exploitability – Easy
 Security Weakness
 Prevalence – Common
 Detectability – Average
 Technical impacts – severe
 Business impacts – Business Specific
CS200Detection and Prevention of SQL Injection
4
WebGoat and WebScarab
 WebGoat – Web based application for demonstration of common Web
App. Flaws.
 Application penetration testing techniques
 WebScarab – use as proxy in the localhost for WebGoat.
 Shows Request and Response intercept
 Parameters can be modified
CS200Detection and Prevention of SQL Injection
5
WebScarab
CS200Detection and Prevention of SQL Injection
6
SQL Injection
 Serious thread
 String query = "SELECT * FROM accounts WHERE custID='" +
request.getParameter("id") + "'";
 Select * from account where username=‘”+a+”’ and PIN=‘”+b+”’;
 Here, a=998’or’1’=‘1, b may be empty or anything.
CS200Detection and Prevention of SQL Injection
7
Prevention Mechanism
 Parametrized Query
 Specific primitive data type
CS200Detection and Prevention of SQL Injection
8
Prevention Mechanism
 Indirect SQL Query
 Avoid Direct SQL Query
 Some tuple similar to the input is taken out and match
 If match is found go ahead otherwise return false
CS200Detection and Prevention of SQL Injection
9
Detection Mechanism
 Methods
 Regular Expression – /w*((%27)|('))((%6F)|o|(%4F))((%72)|r|(%52))/ix
 @"(;|s)(exec|execute|select|insert|update|delete|create|alter|drop|rename|truncate
|backup|restore)s"
 Parametrized
 Visual
 Advantage and disadvantage
CS200Detection and Prevention of SQL Injection
10
Detection Mechanism
CS200Detection and Prevention of SQL Injection
11
Conclusion
 Its not solving the all injection flaws.
 Hierarchical structure of Scanner is required.
 Hashing of user’s input credentials.
CS200Detection and Prevention of SQL Injection
12

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Web Application Security II - SQL Injection

  • 1. Web Application Security Presented by: Md Syed Ahamad Detection and Prevention of SQL Injection 1 Project under: Dr. Ferdous Ahmed
  • 2. Project Role  Theory  Analysis  Implementation CS200Detection and Prevention of SQL Injection 2
  • 3. Topics  Introduction  Webgoat and WebScarab  Prevention Mechanism and Detection Mechanism  Methods  Visual  Advantage and disadvantage  Conclusion CS200Detection and Prevention of SQL Injection 3
  • 4. Introduction  Thread Agent – Application Specific  Attack Vector  Exploitability – Easy  Security Weakness  Prevalence – Common  Detectability – Average  Technical impacts – severe  Business impacts – Business Specific CS200Detection and Prevention of SQL Injection 4
  • 5. WebGoat and WebScarab  WebGoat – Web based application for demonstration of common Web App. Flaws.  Application penetration testing techniques  WebScarab – use as proxy in the localhost for WebGoat.  Shows Request and Response intercept  Parameters can be modified CS200Detection and Prevention of SQL Injection 5
  • 7. SQL Injection  Serious thread  String query = "SELECT * FROM accounts WHERE custID='" + request.getParameter("id") + "'";  Select * from account where username=‘”+a+”’ and PIN=‘”+b+”’;  Here, a=998’or’1’=‘1, b may be empty or anything. CS200Detection and Prevention of SQL Injection 7
  • 8. Prevention Mechanism  Parametrized Query  Specific primitive data type CS200Detection and Prevention of SQL Injection 8
  • 9. Prevention Mechanism  Indirect SQL Query  Avoid Direct SQL Query  Some tuple similar to the input is taken out and match  If match is found go ahead otherwise return false CS200Detection and Prevention of SQL Injection 9
  • 10. Detection Mechanism  Methods  Regular Expression – /w*((%27)|('))((%6F)|o|(%4F))((%72)|r|(%52))/ix  @"(;|s)(exec|execute|select|insert|update|delete|create|alter|drop|rename|truncate |backup|restore)s"  Parametrized  Visual  Advantage and disadvantage CS200Detection and Prevention of SQL Injection 10
  • 11. Detection Mechanism CS200Detection and Prevention of SQL Injection 11
  • 12. Conclusion  Its not solving the all injection flaws.  Hierarchical structure of Scanner is required.  Hashing of user’s input credentials. CS200Detection and Prevention of SQL Injection 12