See the OWASP Article on using SQL Injection to bypass a WAF SQL injection errors occur when: SQL Injection has become a common issue with database-driven web sites.
Essentially, the attack is accomplished by placing a meta character into data input to then place SQL commands in the control plane, which did not exist there before.
This flaw depends on the fact that SQL makes no real distinction between the control and data planes.
In this section, we briefly introduce the Java Script scripting language as a client-side method for validation and other simple tasks.
Java Script isn't a fully fledged programming language like PHP: it can't connect to databases, it's limited as to which system resources it can interact with, and it can't do most tasks a web database application requires.
, and the developers haven’t done any of their own filtering.
This exploit would work just as well in most other programming languages as most of them also lack default input filtering.
Even different versions of Netscape or Internet Explorer support different Java Script features.
Example 7-7 shows how the browser application name and version can be detected with both Java Script and PHP.
, I spoke about several common mistakes that show up in web applications.
Of these, the one that causes the most trouble is insufficient input validation/sanitization.
Let’s imagine a survey collecting four pieces of information: This form will be the centerpiece of our example form processing script.