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Are vulnerability scanning and penetration testing the same thing, and which one is enough for us?

OOnur K***Expert
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#1

We run an e-commerce site selling specialized industrial parts with an annual volume of around 12 million TL. Our infrastructure runs on open-source software with custom developments made by our in-house developer. Last week a cybersecurity firm called us and pitched a security assessment for our website.

We asked for a quote and they gave us two separate options: the first is a vulnerability scan for 12,000 TL, and the second is a web penetration test for 55,000 TL. I couldn't really grasp the reason for this more than fourfold difference. Don't both of them find vulnerabilities anyway?

We are an SME, and our goal is to see our basic security risks without burning through unnecessary budget. What exactly is a vulnerability scan, would it be enough on its own for a business like ours, or do we definitely need to get a penetration test?

OOkan I***Member
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Most Helpful#2

Short answer: A vulnerability scan and a penetration test are definitely not the same thing; while a scan is automated software searching for known vulnerabilities, a penetration test is a manual attempt by a specialist to see if those vulnerabilities can actually be exploited to take over your system. For a small e-commerce site, a scan gives you an initial idea, but it will never catch business logic flaws.

You can think of a vulnerability scan like a robot quickly checking whether your home's doors and windows are locked from the outside. It looks at known software versions, missing security patches, and generates a general list. However, these scanners do not understand business logic flaws. For example, an automated scan cannot detect a logic flaw where a user changes an item's price in the cart to 1 TL using the browser console and places the order.

A penetration test, on the other hand, uses the methods of an actual burglar trying to force the door open, climb the balcony, or pick the lock with a wire. A penetration tester can chain together two minor flaws that a scanner considered insignificant to gain admin panel access or bypass the checkout step.

Since you are running an e-commerce site with your own custom code, relying solely on a scan gives you a false sense of security. The right approach is this: have a comprehensive penetration test done once a year to audit your custom code, and run periodic vulnerability scans throughout the year to catch newly emerging server-level vulnerabilities.

FFatih A***Veteran
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#3

Automated scanners generate a lot of false positives. Meaning they might report something as a critical vulnerability when it actually poses zero risk to your system. Or conversely, they might completely overlook complex flows like a two-factor authentication bypass flaw. The price difference comes down to the expert labor involved.

İİlknur O***Member
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#4

If you go with the 12,000 TL scan, all they'll do is hand you an 80-page raw English output straight from an off-the-shelf software tool. You'll end up having to pay a developer for hours just to understand and sift through the findings in that report anyway.

UUfuk B***MemberCommunity member
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#5

We made that mistake two years ago and bought a scan report just because it was cheap. The report flagged 15 critical red alerts, our dev checked them and turned out 12 of them were just warnings for closed ports. anyway panicked for nothing, total waste of money.

MMerve Y***New member
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#6

To understand the distinction, look at two core differences: 1) Vulnerability scanning finishes within hours using automated tools and just identifies things. 2) A penetration test takes days, actively tries to exploit the identified vulnerability to access the database, and produces proof of concept.

MMelikeExpert
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#7

We had a pen test done on our site last month. On the user profile page where the automated scan found nothing at all, they discovered an authorization flaw that let users view another customer's address and order details. A scanner would never have caught that.

MMurat K***MemberCommunity member
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#8

Sure, you can pay 12,000 TL and basically buy yourself a green checkmark button. You'll sleep well at night, but if credit card data gets leaked from your site, showing that scan report to your customers won't save you.

EElif P***New member
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#9

Bottom line: if your budget is extremely tight, running a scan is better than nothing, but a scan won't solve security issues in your custom code. If you're doing e-commerce, that 55,000 TL pen test isn't an expense, it's straight-up insurance cost.

SSelin A***MemberCommunity member
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#10

Exactly, and not many people know this. Start with a small trial; don't commit to everything at once.

Correct me if I'm wrong.

MMurat Ş***Member
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#11

This is exactly what we experienced. Most time waste accumulates in tasks waiting for approval.

Most incidents start with a leaked password, not a vulnerability. This is my opinion, I'm not claiming it's absolute truth.

AAslıhanMember
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#12

I agree.

CCansu K***Member
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#13

To get into the details: When making a decision first look at what data you have on hand.

If I were you, I'd go this route.

İİbrahim Y***MemberCommunity member
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#14

i have a question. i mean the answer varies greatly by industry; there is no one-size-fits-all rule.

if I were you Id go this route.

MMurat Y***Member
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Doki · Brand identity · 2023

#15

Lets separate the concepts theyre getting mixed up. Any unwritten clause becomes a point of disagreement later as both sides remember it differently.

I'm also curious if anyone does it differently.

KKemal Ö***Member
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#16

Three different views emerged, they all complement each other. Don't rely on a single measure; go layer by layer.

Don't hesitate to ask; those who don't ask always pay more. Proven by experience.

ÖÖzgür G***Member
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#17

My questions are cleared up, thanks. If permission and scope aren't in writing, don't start that test.

If you post the result here, it will help others too.

OOnur A***Member
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#18

Generally correct, but one part is missing. Trying to do this alone is the most expensive way.

GGürkan B***MemberCommunity member
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#19

I have no experience with vulnerability scanning meaning, so I'm asking. Processes without records never improve, because you don't know what to fix.

I'm also curious if anyone does it differently.

RReyhan G***Veteran
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#20

It's rare to find an explanation this clear.

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