Flawed Online Tutorials Led To Vulnerabilities In Software (helpnetsecurity.com)

An anonymous reader quotes Help Net Security: Researchers from several German universities have checked the PHP codebases of over 64,000 projects on GitHub, and found 117 vulnerabilities that they believe have been introduced through the use of code from popular but insufficiently reviewed tutorials. The researchers identified popular tutorials by inputting search terms such as "mysql tutorial", "php search form", "javascript echo user input", etc. into Google Search. The first five results for each query were then manually reviewed and evaluated for SQLi and XSS vulnerabilities by following the Open Web Application Security Project's Guidelines. This resulted in the discovery of 9 tutorials containing vulnerable code (6 with SQLi, 3 with XSS).
The researchers then checked for the code in GitHub repositories, and concluded that "there is a substantial, if not causal, link between insecure tutorials and web application vulnerabilities." Their paper is titled "Leveraging Flawed Tutorials for Seeding Large-Scale Web Vulnerability Discovery."

Comments

I believe it

[JustAnotherOldGuy]

I believe it.

I've come across countless tutorials that cover things like capturing and using form field input, but almost NEVER see a single word in them about sanitizing data, or guarding against bad, malformed, or malicious data.

It's just, "Here's how ya get the data, now go jam it in the database or print it right to the screen!" Fuck me.

And in all fairness, as a PHP user, I've seen a *lot* of PHP tutorials that were bad, stupidly dangerous, or just plain wrong. One of the most egregious was a "tutorial" that showed sending the entire SQL statement to the server as a GET parameter. That's right, some guy actually coded his shot so that it sent a live SQL statement in the URL, and then blithely processed the attached variables without so much as a how-de-do.

Later I saw code that did this exact thing used in various scripts (guestbooks, registration forms, comment forms), probably based on this epically flawed "tutorial".