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Author Archives: Karlom

What are the security risks of allowing users to add iframes?

Posted on July 22, 2020 by Karlom

In my web app I’m using a good sanitizer which let’s me to whitelist some specific html tags.
I’d like to allow <iframe> so that users can insert youtube videos and so on.
However I’m worried about vulnerabilities that this approach … Continue reading What are the security risks of allowing users to add iframes?→

Posted in iframe, Vulnerability, web-application

Can I find a remote IP by hostname? [closed]

Posted on December 27, 2019 by Karlom

Suppose that I know my server’s FQDN hostname is bobserver and the server is connected to Internet.

Is it possible for the outside world to find my server’s IP address by knowing only the hostname? If so, how?

Continue reading Can I find a remote IP by hostname? [closed]→

Posted in dns-domain, ip

What are the security concerns for base64 encoded JSON files?

Posted on October 19, 2018 by Karlom

In a REST API, I’d like to receive images as base64 encoded strings in a JSON objects fron user’s post and save them to disk using node.js fs module.

The request body are objects like:

{ file: ‘data:image/png;base64,iVBO… Continue reading What are the security concerns for base64 encoded JSON files?→

Posted in json, storage | Tagged Image

How insecure is a hidden admin url without authentication? [duplicate]

Posted on September 1, 2017 by Karlom

This question already has an answer here:

Is an unknown directory structure considered security by obscurity? [duplicate]

1 answer

… Continue reading How insecure is a hidden admin url without authentication? [duplicate]→

Posted in authentication, web-application

Is it safe to send password as url parameter when using ssl? [duplicate]

Posted on August 24, 2017 by Karlom

This question already has an answer here:

Is it safe to send clear usernames/passwords on a https connection to authenticate users?

8 answers

… Continue reading Is it safe to send password as url parameter when using ssl? [duplicate]→

Posted in TLS, web-application

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