Home Backend Development PHP Tutorial Is addslashes() a Reliable Defense Against SQL Injection Attacks in PHP?

Is addslashes() a Reliable Defense Against SQL Injection Attacks in PHP?

Dec 04, 2024 am 12:27 AM

Is addslashes() a Reliable Defense Against SQL Injection Attacks in PHP?

Understanding SQL Injections via addslashes()

In PHP, addslashes() is often compared to mysql_real_escape_string as a security measure against SQL injections. While both can assist in safeguarding data, examples demonstrate that addslashes() might permit exploitations.

One method an attack can occur is by manipulating addslashes() to incorporate a backslash into a multibyte character. As a result, the backslash's protective role is neutralized, and a malicious query can be constructed.

For example, consider the following query using addslashes():

$query = "SELECT * FROM users WHERE name = '" . addslashes($_GET['name']) . "'";
Copy after login

An attacker could pass the following as the "name" parameter:

'John Doe' OR 1 = 1 --
Copy after login

Normally, the single quote would be escaped by addslashes(). However, in this case, the attacker relies on the multibyte character "Ö". When "Ö" is encoded in UTF-8, it consists of three bytes: 0xC3, 0xB6, and 0x9C.

Addslashes() interprets the attacker's input as:

'John Doe' ÖR 1 \= 1 --
Copy after login

With the backslash placed within the multibyte character, addslashes() treats it as a continuation of the character rather than an escaping symbol. Consequently, the SQL query is not properly escaped, enabling the attacker to bypass security measures.

It's crucial to note that this type of attack only applies to character encodings where multibyte characters exist that end with 0x5c (the backslash character). UTF-8, however, does not conform to this, reducing its vulnerability to this specific attack vector.

The above is the detailed content of Is addslashes() a Reliable Defense Against SQL Injection Attacks in PHP?. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
2 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Repo: How To Revive Teammates
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: How To Get Giant Seeds
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
2 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Repo: How To Revive Teammates
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: How To Get Giant Seeds
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Article Tags

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

11 Best PHP URL Shortener Scripts (Free and Premium) 11 Best PHP URL Shortener Scripts (Free and Premium) Mar 03, 2025 am 10:49 AM

11 Best PHP URL Shortener Scripts (Free and Premium)

Introduction to the Instagram API Introduction to the Instagram API Mar 02, 2025 am 09:32 AM

Introduction to the Instagram API

Working with Flash Session Data in Laravel Working with Flash Session Data in Laravel Mar 12, 2025 pm 05:08 PM

Working with Flash Session Data in Laravel

Build a React App With a Laravel Back End: Part 2, React Build a React App With a Laravel Back End: Part 2, React Mar 04, 2025 am 09:33 AM

Build a React App With a Laravel Back End: Part 2, React

Simplified HTTP Response Mocking in Laravel Tests Simplified HTTP Response Mocking in Laravel Tests Mar 12, 2025 pm 05:09 PM

Simplified HTTP Response Mocking in Laravel Tests

cURL in PHP: How to Use the PHP cURL Extension in REST APIs cURL in PHP: How to Use the PHP cURL Extension in REST APIs Mar 14, 2025 am 11:42 AM

cURL in PHP: How to Use the PHP cURL Extension in REST APIs

12 Best PHP Chat Scripts on CodeCanyon 12 Best PHP Chat Scripts on CodeCanyon Mar 13, 2025 pm 12:08 PM

12 Best PHP Chat Scripts on CodeCanyon

Announcement of 2025 PHP Situation Survey Announcement of 2025 PHP Situation Survey Mar 03, 2025 pm 04:20 PM

Announcement of 2025 PHP Situation Survey

See all articles