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What is query sanitization?
Sanitization is ensuring that value X, which is expected to be a number (e.g. integer) isn’t somehow a string.
What is data sanitization in SQL?
If data will be sent in a SQL string to a database, then it needs SQL sanitization. If data will be sent to the browser in JavaScript, then it needs JavaScript sanitization. The same applies to HTML, JSON, XML, or any other language or format. The rules about what could be harmful, depend on the format.
How does SQL sanitization work?
To make an SQL Injection attack, an attacker must first find vulnerable user inputs within the web page or web application. After the attacker sends this content, malicious SQL commands are executed in the database. SQL is a query language that was designed to manage data stored in relational databases.
Is erasing a hard drive sanitizing or destroying data?
Hard Disk Drives (HDD) can have their data erased by ruining the magnetic fields of their disks in a process known as degaussing, but the drive won’t be able to store data after being degaussed.
What is the problem with input sanitization in SQL?
Input sanitization is a horrible term that pretends you can wave a magic wand at data and make it “safe data”. The problem is that the definition of “safe” changes when the data is interpreted by different pieces of software. Data that may be safe to be embedded in an SQL query may not be safe for embedding in HTML.
Is it good to sanitize input for parameterized queries?
Yes. It’s always a good idea to sanitize the input before sending it to the database. Parameterized queries might save you from SQL injection attacks, but might not prove beneficial in case of stored XSS attacks.
When to sanitize data in the output context?
Data should be further sanitized on output depending on context. Sanitization involves transforming (possibly destructively) the data to be safe in the output context. Remember that sometimes a single piece of data may be used in multiple contexts on the same page.
Is it safe to sanitize input data in PHP?
We think it’s fair to assume that it’s written in PHP as the form’s action is index.php. In this code, the query string parameter search is echoed back to the user without sanitization. An attacker could email or IM unsuspecting users a crafted URL that escapes out of the and does nasty things with JavaScript.