Questions tagged [cdn]

Security practices of as well as security implications of using a Content Delivery Network such as Cloudflare or Akamai.

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Can Azure CDN mask vulnerability scans

We have a website https://ourwebsite.web.core.windows.net/ which needs to be made public(available on Internet for anyone) and did a Qualys scan using an external scanner on it which found 40 ...
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1answer
43 views

CDN vs server-level GeoIP

Suppose a website is set up so that only IPs from country X are allowed read/write access. This server goes through a CDN such as Cloudflare. Because the GeoIP read block is at server level, it never ...
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What is the Akamai Name Server I see for some big companies?

I have played with DNS a lot lately, and I have found that some big companies' web sites use the Akamai NS as the Name Server for their WWW servers, for example: $>nslookup > www.redhat.com ...
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60 views

CDN end to end encryption?

I setup Cloudflare CDN for my site. I added my site to Cloudflare and it asked me to add Cloudflare nameserver to my domain. I did that in my DNS registrar portal. That's all I did. Now I'm able to ...
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1answer
38 views

Why do CDNs allow arbitrary backend to be set, is it not a big security concern?

I found most CDNs allow the user to claim any domains to be the backend, I wonder why they do this instead of verifying if the user owns the backend domain. If I have myowndomain.com and set the ...
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2answers
63 views

Is there a security risk in hosting an app's HTML/JavaScript payment system on a CDN?

We have a mobile app (React and Expo) in which the user is able to provide payment via Stripe. Our implementation uses a WebView which renders HTML and JavaScript content, which in turn pulls in the ...
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66 views

Remotely poisoning Cloudflare's cache servers by James Kettle's Web Cache Poisoning Attack?

I am recently exploring and playing with James Kettle's Practical Web Cache Poisoning attack. The last part of his post mentioned that Cross-Cloud Poisoning is possible, however, I can't find a way to ...
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3answers
177 views

Is it possible to scan the whole IP range to find a domain behind the CDN?

I am very curious if it is possible to find the real IP address of a domain "protected" by a CDN service. For example, www.cnn.com uses Fastly service, and the domain name only resolves to a Fastly ...
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2answers
194 views

Does Cloudflare masking my IP make my server more secure?

I've heard in a conversation and read in some forum posts that Cloudflare will proxy your IP, hiding it from the public, and this mitigates the risk of an attacker finding your server in the first ...
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2answers
214 views

How does a CDN actually prevent DDoS attacks, when an origin server accepts direct connections?

I am trying to understand how a CDN (like Cloudflare e.g) does protect against a DDoS attack. I would think that the internet traffic is routed through a CDN's reverse proxy, then filtered. This ...
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1answer
84 views

Does a DDOS attack on an application using CDN have to first bring down all the involved CDN servers to affect the application's availability?

CDN are said to absorb and mitigate the Denial of Service and DDOS attacks. Consider an application that uses a CDN provider to deliver its content. So if an attacker tries to bring down such an ...
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1answer
487 views

Is there a multi-layered DoS protection which can be tightly integrated with cloud hosting services?

I know that one can deny services (DoS) in any of the 7 layers of the OSI model and that in principle, a denial can be done by a single entity (human or machine) or from 2 or more such entities ("...
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90 views

How can an attacker hijack js/css content?

I just encounter an issue, the cached js files showed porn site Here's the simple network diagram. https://cdn.mysite.com/js/app.js shows a porn site, but if I add in query string https://cdn....
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2answers
98 views

Why do so many websites use third-party sites for hosting JavaScripts?

Why do so many websites serve JavaScripts from ajax.googleapis.com and other third-party sites? Wouldn't it be securer for these sites to host these scripts themselves?
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Risks of not enabling HSTS on a static content subdomain. Even though main domain does have hsts

I'm investigating an issue where our static content (js, css) is deployed in AWS Cloudfront under a subdomain of our main website and doesn't have HSTS enabled. The main domain does have HSTS enabled ...
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1answer
230 views

Is it secure to handle the OAuth 2 Authorization callback from a CDN?

This question is in the context of the OAuth 2.0 Authorization Framework. Consider a web application that is backed by a first-party API but relies on a third-party authorization server for SSO. Say ...
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2answers
534 views

What are the damages when a CDN gets hacked?

I was reading about CDN services and how they work. I saw this article about how a US army site got hacked by using a CDN: https://www.welivesecurity.com/2015/06/09/us-army-website-hack/ When ...
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16k views

How can ISPs handle DDoS attacks?

How can an ISP with low bandwidth like 50 Gbps handle a DDoS attack with more than this? I know there is a solution called "Black Hole". Is this enough to mitigate DDoS attacks or are there any other ...
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1answer
345 views

How to ensure the third party CDN is secure (and stays secure)?

Most of the modern applications are using CDN for third party libraries. For example, let's say I use xxxv2.min.js from cdn.example.com/xxxv2.min.js Everything is good, until the day that company has ...
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1answer
171 views

How to protect a website from DDoS without a CDN? [closed]

I have basic knowledge in Bash and with that knowledge I rented a remote machine in a mostly-self-managed hosting platform (DigitalOcean) and raised a LEMP environment on which I have a website. I ...
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1answer
204 views

Should a CDN service like Cloudflare protect against Brute Force Attacks, or only from DDoS?

I know that CDN services usually protect a user by hiding it's original machine's IP and by screening (and banning) any attackers that send too many requests in the form of DDoS. But should a CDN ...
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3answers
6k views

How does a company like CloudFlare block bot crawling and email harvesters?

I saw this on CloudFlares homepage: CloudFlare protects against a range of threats: cross site scripting, SQL injection, comment spam, excessive bot crawling, email harvesters, and more. How could ...
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3answers
5k views

How can CloudFlare provide a valid SSL certificate for domains not under its control?

CloudFlare provides a reverse proxy, and it offers SSL support ("flexible", "full", "strict full", and "keyless"). How does CloudFlare manage to get a valid certificate for domains it does not own? ...
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822 views

How can cloudflare read encrypted request without private key? [duplicate]

We have Cloudflare in our production server and the encryption level is full, not flexible. This webpage said Cloudflare can decrypt the request. But we didn't give our server's private key to ...