Question $1$

A web application uses JavaScript to validate user input on the client side. The code of the HTML form is as follows:

$```$

function ValidateForm$($theForm$)$

$\{$

var isInteger $=/^\backslash$d$+$$$/$

if $(!$isInteger.test$($theForm$.$quantity.value$))$

$\{$

alert$("$Please enter a valid quantity"$)$;

return false;

$\}$

return true;

$\}$

$/$script$>$

Quantity:

$```$

$1)$ What information can you infer about server$-$side technologies?

$2)$ What vulnerabilities do you find in this application? Are they design vulnerabilities or implementation vulnerabilities?

$3)$ How can an attacker exploit these vulnerabilities?

Question $1$

A web application uses JavaScript to validate user input on the client side. The code of the HTML form is as follows:

$```$