Questions tagged [cloudflare]

Cloudflare is a Content Delivery Network (CDN).

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What happens if both DoH and DoT are enabled?

If I have DNS over HTTPS and DNS over TLS activated simultaneously (router has DoT activated and smartphone browser has DoH activated, so I see on https://1.1.1.1/help DoH: yes and DoT: yes), which ...
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1 vote
1 answer
387 views

Any Cloudflare's DNS over TLS (DoT) check + DNSSEC test?

In my original question from 2020, I was unsuccessful in my effort to setup Cloudflare's (link to docs) DNS over TLS (DoT) (link to wiki) in my old, and now decomissioned, router: Does Cloudflare'...
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1 answer
205 views

Cloudflare SQLinjection protection

I'm testing for vulnerabilities for a specific site using sqlmap. However, the site has a cloudflare firewall which blocks queries including for example *, ANY or OR. I sort of found a bypass while ...
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1 vote
0 answers
58 views

How are DDOS protection mechanisms setup when confidential data is involved?

Scenario: A hospital has the records of all patients. There is an online portal where patients can login to see their personal medical data. Since a hospital is an obvious target for any type of hack, ...
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1 vote
2 answers
404 views

Bypass WAF to perform XSS?

I am trying to find an XSS in website protected by Cloudflare. I use Burp to find which HTML tags allowed. Only the <script/> is tag disallowed. I tested multiple payloads to pass the WAF and ...
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1 answer
172 views

My ISP seems to be intercepting my DNS requests even though my router is set to use Cloudflare [duplicate]

I am using an Indian ISP, one that is notorious for DNS hijacking and script injection (BSNL). I have my router set to use Cloudflare's Family DNS. But despite this, every time I attempt to access a ...
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What are the benefits of using a Cloudflare's DNS (not WARP) instead of ISP's DNS? [duplicate]

What advantages users get, specifically, from 'PRIVACY' point-of-view? Can ISP still see and log browsing history? Can user's location be still traceable? What's the ultimate security & privacy ...
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16 votes
2 answers
6k views

Is cloudflare injecting tracking code for PDF requests in browsers via the browser PDF plugin?

Opening a PDF link in the browser (e.g. google chrome with the ootb PDF viewer plugin) apparently indicates that when the PDF is hosted on a cloudflare-facing domain there is additional data present ...
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2 answers
131 views

Can wide IPv6 adoption make technologies like ECH obsolete?

Encrypted Client Hello (ECH) encrypts the whole Client hello and because of that ISPs won't know which website any given user intends to visit unless the website is using a dedicated IP address and ...
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1 answer
119 views

pfsense subdomain timeout with error 522

I want to attach a valid ssl subdomain to my pfsense. I would check it (with warnings) via my the pfsense's IP 192.168.11.1 . I used multiple tutorials to come up with the following: Bought a domain ...
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2 answers
210 views

No SSL between Cloudflare and S3 static site. A big security issue?

So I have a S3 static website. Domain, DNS and proxy is managed via Cloudflare. Cloudflare is set to communicate with browsers using SSL and it in fact enforces SSL for non-SSL requests. However, ...
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  • 101
13 votes
3 answers
3k views

Webserver DDOS protection without giving away private keys (https, tls, ssl)

What are the possible ways to protect an organization's web servers from a DDoS attack without giving away your web server's https private keys? Many of the common solutions for DDoS protection of a ...
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2 votes
1 answer
136 views

Rate Limit DNS Subdomain Requests

I work at a company that provides a SaaS program for other organizations, and each subscribed organization receives their own subdomain of their choosing - generally they choose the organization name. ...
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0 answers
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Is using randomized filenames a good way to secure data stored in a product like S3?

If I want to use a S3 clone to host something somewhat sensitive (probably digitalocean, since it's cheapest and probably has a perfectly good quality), is it sensible to do it this way: https://...
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1 vote
2 answers
512 views

Does Cloudflare's DNS over TLS (DoT) implement DNSSEC too?

I am confused about if I decided to implement DNS over TLS (DoT), would I lose DNSSEC? Details: I am connected with IPv4 + IPv6 Cloudflare DNS directly in my home OpenWrt router. I love the idea of ...
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8 votes
1 answer
5k views

What does using Cloudflares WARP app offer that HTTPS (websites) alongside DNS over HTTPS / TLS doesn't?

Intoduction to Cloudflare WARP I’ve been looking at Cloudflares WARP app for mobile. It claims to be a VPN but without some of the IP hiding anonymity features normal VPNS have: “Under the covers, ...
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2 votes
3 answers
1k views

Security implications of Cloudflare's SSL Full mode (not Strict)

Cloudflare enables several options regarding the communication between its servers and our own. "SSL Full" means Cloudflare encrypts the traffic but doesn't check the validity of our servers'...
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-1 votes
1 answer
333 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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2 votes
1 answer
214 views

Seems my CNAMEs got "curled". Somebody please explain this to me

According to my CloudFlare firewall logs, somebody went through each of my subdomains. My website is not advertised, it doesn't even show on Google unless typing the exact domain name into it. I think ...
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0 votes
1 answer
176 views

Cloudflare Full Strict HTTPS flow

I would like to understand Cloudflare full(strict) SSL flow. Because if user type https://example.com it redirects to Cloudflare web servers. So how Cloudflare decrypt HTTPS data before sending to ...
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2 answers
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Is using Cloudflare, and other services that proxy your site, a security hazard?

If I understand correctly, they can see all the requests that are coming in to your server. So, all POST requests (user credentials, comments user posts, and many more) can be seen by Cloudflare (...
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1 vote
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How do you mitigate the risk of stolen unencrypted data because you are using Cloud DNS to proxy the request that are sent to your server?

Goal My goal is to build a PWA. I am new to programming and I believe it is better to start with NGINX. I have not found a good article (explaining the security risk) about using the Cloud DNS (such ...
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3 votes
0 answers
210 views

How does Cloudflare negotiate its server certificate?

When I access https://example.com on my company's laptop that has a X509 client certificate installed, using my home internet connection, without using a VPN, the requested page is signed using the ...
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5 votes
2 answers
384 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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  • 302
2 votes
1 answer
2k views

Is there any way to pretend like we are routing our request via cloudflare? [closed]

There is this Web App which uses cloudflare and to bypass certain things I had to find a way to access the actual web server directly. I tried numerous things and finally I think I have found the ...
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2 votes
4 answers
2k views

How do I configure Azure Web Apps so that the only access is via CloudFlare?

I have a Web Apps (Linux) application on Azure, and I added a custom domain which I have protected with CloudFlare. I added Azure Security Center to my subscription. At the moment one can access the ...
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7 votes
2 answers
739 views

Does cloudflare protect against BREACH attacks?

I know that enabling http compression would make a server vulnerable to the BREACH attacks. So we have disabled compression from the server side, tested and it was all good. Then we implemented ...
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-2 votes
2 answers
276 views

Did I just find a bug in CloudFlare or is this a feature?

While doing penetration testing for a client I stumbled upon a security incident. CloudFlare promises to hide the origin IP address when using its DNS. I went to dnsdumpster.com, inputted my client's ...
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3 votes
2 answers
315 views

How do I prevent traffic on my site from a source other than Cloudflare?

I use Google Cloud Platform to serve the site I manage. I have one load balancer there, which controls the movement to several virtual machines. When I came across the problem of DDOS attacks on ...
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0 votes
0 answers
601 views

Requests logged in Cloudflare as "XSS, HTML Injection - Body"

Rule name: XSS, HTML Injection - Body Rule: 100096BHTML Since about a week ago, requests matching this WAF rule have strongly increased on a customer's website. This is an example graph showing only ...
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2 votes
2 answers
740 views

Can't Cloudflare sniff sensitive login data from its users' websites?

So I recently started using the free Cloudflare plan for my website to provide any sort of protection. And I noticed that, given they do the whole "We'll accelerate your website by caching parts of ...
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1 vote
0 answers
137 views

Bot detection without client script

I am working in a small startup and we are looking for Security tools - mostly WAF and Bot Detection (specifically to identify click fraud). Some solutions that integrate client side scripts are ...
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1 vote
1 answer
2k views

How to verify website owner behind CloudFlare SSL?

I went to Bittrex today and noticed the SSL certificate is issued to CloudFlare, not Bittrex, as seen in the screenshot below. I'm used to seeing information on this screen which can be recognized as ...
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  • 113
1 vote
2 answers
186 views

Could the use of Cloudflare's free SSL feature result in loss of availability?

When using Cloudflare's free shared SSL feature, the certificate for your website is shared with dozens of others websites via the use of SANs (Subject Alternate Names). Of course some of these ...
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3 votes
1 answer
388 views

Why is TLS1.2 wrapped in TLS1.3?

I was just curious about TLS1.3 which Cloudflare is one of the companies leading the implementation. I then visited blog.cloudflare.com and turned on my Wireshark. I am not 100% clear about all ...
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0 votes
1 answer
86 views

CentOS payload injection attempts? [duplicate]

My PHP logs have been flooding with seemingly random attempts to access scripts and software which isn't installed on my server. At first, All the attempts came from a single IP, I was using ...
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1 vote
0 answers
234 views

health check to test haproxy -- request deny with 200. good idea?

I have been working on a multi-provider redundant load balancing solution using HAProxy, AWS, and Cloudflare. I have a solution, and I believe it will be secure, but I am looking for further ...
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2 votes
2 answers
1k views

How does Cloudflare track their client? Tor is not a workaround

I mirrored a ecommerce site using wget. This site seems to use Cloudflare to handle their web traffic. What's interesting is that after 90 % or so of the mirroring was done, wget started to produce/...
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1 vote
0 answers
147 views

HSTS over HTTP-CDN-HTTPs chain [closed]

I'm using CloudFlare's flexible SSL: Flexible SSL: You cannot configure HTTPS support on your origin, even with a certificate that is not valid for your site. Visitors will be able to access ...
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6 votes
1 answer
296 views

How SSL/TLS handshake happens when we use Cloudflare Service?

I was reading about the offerings of the Cloudflare and then I read about the working of Cloudflare. Based on my understanding, the domain name of my website(alice.com) is resolved to the IP address ...
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0 votes
1 answer
238 views

SSL to web server from Cloudflare

Hey I have Cloudflare protecting my website. I had a Let's Encrypt SSL certificate encrypting it before. If I send a request and it passes through Cloudflare. When it gets to my web server will it be ...
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1 vote
1 answer
376 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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5 votes
2 answers
1k 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 ...
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0 votes
1 answer
174 views

Cloudflare cipher selection based on AES-NI support

How does Cloudflare selects AES ciphers on devices with AES acceleration and ChaCha on devices without it ?
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22 votes
3 answers
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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9 votes
3 answers
6k 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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1 vote
2 answers
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CloudFlare - prompted for "attention required"

I am getting a CloudFlare - attention required / security check prompt on most of the sites I visit through my Macbook running OS X Yosemite, these sites work perfectly on other devices (such as iPad, ...
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