Questions tagged [content-security-policy]
This tag is for the Content-Security-Policy HTTP header. For policies in companies, use [corporate-policy].
157
questions
1
vote
0answers
31 views
chrome-extension as source of CSP policy violation
Here is an extract from a CSP report
[csp-report] => Array
(
[blocked-uri] => chrome-extension
[column-number] => 27329
[document-uri] => https://www.mysite.com/...
2
votes
2answers
85 views
Why only script-src unsafe-inline is reported as a high severity finding?
I'm evaluating a CSP policy using https://csp-evaluator.withgoogle.com/. The policy is configured as follow:
default-src 'self';object-src 'self';script-src 'self' 'unsafe-inline' 'unsafe-eval';script-...
0
votes
1answer
50 views
CSP allowing Base64 encoded images without unsafe-eval
If I allow base64 encoded images to load on my website, but I do not have unsafe-eval enabled, nor have I allowed 'inline-script' would my site still be at risk by allowing base64 encoded image data ...
1
vote
0answers
48 views
Safely render HTML template with inline CSS from trusted domain (it forces the use of “style-src: unsafe-inline” in CSP)
I am working with a form that a user can fill out to send an e-mail. As part of the form, there is a preview button that shows the user a preview of how the mail will look in a new tab in the browser. ...
2
votes
2answers
77 views
Reverse tabnabbing: why not redirect the user in the new tab itself instead of the parent tab?
I have recently been reading about reverse tabnabbing, where a child window can change the url of the parent window if it has access to window.opener (which it has by default unless you explicitly ...
2
votes
2answers
114 views
What is the behaviour of CSP if default-src not specified?
Basically all in the title.
Imagine a simple CSP like
Content-Security-Policy: script-src 'self'
What is the behaviour of directives that would normally fall back to default-src which are not ...
1
vote
1answer
56 views
Is it possible to bypass malformed Content Security Policy missing quotes?
I found a website that has a very strict but malformed Content Security Policy of the form:
Content-Security-Policy: script-src none
which should actually be
Content-Security-Policy: script-src 'none'...
0
votes
2answers
81 views
Does CSP mitigate against client prototype pollution XSS and DOM XSS?
DOM XSS and client prototype pollution-based XSS have one thing in common, we are modifying the pre-existing JavaScript code to popup an alert(1). Will CSP mitigate XSS in this case? Theoretically, ...
2
votes
1answer
65 views
Content-Secure-Policy headers
I am performing a security assessment on a web application and I found it doesn't have the Content-Security-Policy, but instead it has Content-Secure-Policy. It is literally the first time I'm seeing ...
0
votes
2answers
106 views
What do I risk if I use CSP header style-src-attr 'unsafe-hashes' <hash>
I'm wondering if I'm risking anything if I use
style-src-attr 'unsafe-hashes' <hash>
in my CSP header.
I need to allow an external script to run, and it uses the style attribute on some ...
0
votes
1answer
67 views
Save encrypted data in server . With no way for server to read actual data
Hello i am developing an app that collects some private data from my clients. My clients wont like it if i am able to read the data. So the data is encrypted in cleint side with a key say "xyz&...
0
votes
1answer
62 views
Is https://div.show/options fraud/malware? [closed]
Is https://div.show/options fraud/malware? I saw via https://app.uriports.com that a customer tried to load the page mentioned before and it was blocked thanks to CSP.
0
votes
0answers
53 views
Which security headers should be sent with static files such as css/js/images
Of the security headers listed here: https://owasp.org/www-project-secure-headers/ which ones should be sent with static files (css, js, images etc) and what does setting them each achieve in that ...
1
vote
0answers
74 views
Do object-src and base-uri bypasses still work on Content-Security-Policies?
I'm assessing the security level of a webapp and one of the test cases is the CSP header. I always use the Google CSP evaluator to assess the header. Let's consider the following CSP header:
Content-...
2
votes
0answers
91 views
Understanding CSP: report shows blocked <script> that shouldn't have been blocked
I'm having trouble making sense of some reported CSP violations that don't seem to actually be violations according to the CSP standard. I have not managed to reproduce the violations in my own ...
1
vote
1answer
67 views
Is nonce useless when user input is reflected within an inline script?
I stumbled upon a web app which is accepting user input and putting it into a variable within script tag.
The script tag does have a nonce attribute.
As am working on bypassing the XSS filter, I had ...
3
votes
2answers
60 views
Serving “less trusted” content on the same domain
Let's say we run a web app at "example.org". It uses cookies for user authentication.
Our website also has a blog at "example.org/blog", hosted by a third party. Our load ...
0
votes
0answers
87 views
CSRF token not sent when calling the back-end?
My system composes of NuxtJs and AdonisJs application.
Adonis handles csrf tokens for us by sending:
set-cookie: adonis-session=XXX; Path=/; HttpOnly
set-cookie: XSRF-TOKEN=XXX; Max-Age=7200; Path=/; ...
1
vote
1answer
70 views
CSP Violation ms-appx-web://
We have a java application which allows users to upload attachments and save it on the server. The application has a content security policy defined like this:
base-uri 'self'; child-src 'self'; form-...
1
vote
1answer
110 views
3D secure 2 and CSP
I'm building a checkout page for a website and have a checkout page with a content security policy (CSP).
When the customer pays with a card, they will see a box popup with the bank page that allows ...
0
votes
1answer
49 views
Error on Content Security Policy while testing for Clickjacking
I was recently testing for Clickjacking and when I opened developer tools, I was warning
Content Security Policy: Ignoring “'unsafe-inline'” within script-src or style-src: nonce-source or hash-source ...
1
vote
1answer
81 views
Enabling HTTP Security headers in S/4 Hana web applications
We have 3-4 S/4 HANA applications in our environment and want to enable HTTP Security Headers, but couldn't figure out how to go about it. We then approached SAP directly and even their solutions are ...
0
votes
0answers
30 views
Security Benefits of Having a Content Security Policy for a Domain Loaded through iframe
Consider the below scenario:
There's a checkout webpage that can be accessed at checkout.example.com. This page has decent security policy. But just to prevent any credit card info leakage, credit ...
0
votes
1answer
44 views
Content-Security-Policy (CSP) HTTP Header useful for direct link to image?
Is there any reason to show a Content-Security-Policy (CSP) HTTP Header for direct links to images such as https://invalid.tld/direct-link-to-image.jpeg?
0
votes
0answers
31 views
Are there any known attacks against a dynamically inserted Content Security Policy?
Taking the example of an HTML page with meta elements. You could either define the CSP in the meta tags of the HTML, or use JavaScript to insert a new meta element as a sibling of the existing meta ...
2
votes
4answers
563 views
Content Security Policy applied to Single Page Applications: Is it worth it with unsafe-inline?
I have a website developed using VueJS (i.e. its a single page application). I've been looking at implementing Content Security Policy headers. As I tested out the header values I would need, I ...
0
votes
0answers
32 views
Is there a way to limit cookies to certain hosts in HTTP?
Using Nginx, I hope to restrict the permissible hosts for cookies. My initial intention was to employ a Content Security Policy for this purpose, but I don't see an obvious way to do this via a CSP. ...
2
votes
1answer
164 views
CSP is not enforced inside Web Worker
A CSP response header is set on the web worker JS file, but it is not enforced by the browser. The CSP is enforced in the Web worker only if the parent document's response header contains the CSP ...
0
votes
0answers
65 views
CSP header img-src data: without URI
I am testing application with CSP header like this:
Content-Security-Policy: style-src 'self' 'unsafe-inline' https://fonts.googleapis.com/css ;script-src 'self' 'unsafe-inline' 'unsafe-eval' https:/...
1
vote
1answer
36 views
Is there any way for a Content-Security-Policy to block a CSS function, (specifically the url() function)?
I would like to block the execution of any instance of CSS's url() function in CSS provided by my server. One promising method would be a CSP, but I'm not sure if this is possible using a CSP. Is it? ...
0
votes
0answers
125 views
CSP: any way to prevent inline scripts dynamically created by a trusted external script?
Let's say I have a simple web application which uses a single JavaScript (JS) file, loaded from its own domain, and has implemented the restrictive Content Security Policy (CSP) of default-src 'self'. ...
0
votes
1answer
50 views
Security headers in application vs. Tomcat default 40x error
I would like to assess the actual risk for various CORS attacks when a web application properly sets CSP and other response headers, but the app server error page does not. When a 40x can be provoked ...
0
votes
1answer
290 views
WYSIWYG Rich text editor and renderer with no XSS risks
In our web app, we need to allow users to input rich text which is then presented to other users. We are looking for a simple WYSIWYG (JavaScript) editor that outputs a format which is backwards ...
0
votes
0answers
81 views
Why CSP vs XSS?
I understand CSP can be beneficial against multiple attack vectors (i.e clickjacking, XSS), but as it specifically relates to XSS -- why is it a solution?
My reason for asking this question stems ...
1
vote
1answer
101 views
Best Firewall Zone Settings for Security Gli-net Routers
I believe many will benefit from this as there is not clear answer online and I keep making my policies too strong and locking myself out from accessing the LAN admin panel.
What would be the ...
0
votes
1answer
505 views
NONCE not supported in Asp.Net for CSP implementation
Is NONCE supported in Asp.Net when implementing Content-Security-Policy header to protect from XSS ??
I read that NONCE was not supported in Asp.Net, however I read another simple article, that shows ...
0
votes
0answers
90 views
Correct CSP frame-src value for iframes with empty src value
We have below CSP derivatives defined in our site,
script-src 'self' 'unsafe-inline' 'unsafe-eval' *.youtube.com; style-src 'self' 'unsafe-inline'; frame-src *.facebook.com www.youtube.com;
As ...
3
votes
1answer
240 views
Why is CSP require-sri-for marked as obsolete?
The description from Mozilla warns that require-sri-for is obsolete and may be removed at any time.
The feature seems useful, especially for large websites where it's likely that a developer may ...
5
votes
1answer
701 views
What was the real reason for dropping reflected-xss directive from CSP?
There were two response headers which could be set by servers to instruct browsers to enable heuristics based reflected XSS detection and prevention in the past.
X-XSS Protection: 1; mode=block
...
5
votes
1answer
290 views
Why does Chrome claim that this stylesheet violates the Content Security Policy?
I have a website in which I include several CSS stylesheets from my own server and one stylesheet from a remote server.
I wanted to write my Content Security Policy in a way to permit all local ...
8
votes
1answer
994 views
Content Security Policy Style Hash
I have an img tag on a page with an line style that looks like this:
style="height:50px;width:180px;display:block;"
I can't move it to an external stylesheet because the img tag is generated by a ...
0
votes
1answer
91 views
XSS and Content Security Policy, and existing CSS
I have done the first development of a website and deployment. Scanning the server with an online security evaluation tool I was recommended that I add a Content security Policy to the website, and I ...
-1
votes
2answers
94 views
How does a Content Security Policy help with preventing XSS and other injection vulnerabilities? [closed]
I was reading up on CSP's and I did some testing on a site which had one implemented, I found an xss vulnerability even though it was using a CSP.
2
votes
1answer
66 views
Off the shelf JavaScript based CSP alternative - is it safe?
Are off the shelf CSP alternatives like Ensighten used by BritishAirways any good/safe? As and example, the way the bootstrap script seems to work is to bind its own proxy methods to XMLHttpRequest ...
2
votes
1answer
712 views
In a content security policy header: Should the url's be quoted or not, and is there any security implication to this decision?
So in a CSP like the below:
content-security-policy: upgrade-insecure-requests; frame-ancestors 'self' https://stackexchange.com
Should the url part be quoted like this (example from mozilla ...
2
votes
2answers
139 views
How safe is it to allow JS CDNs in a HTTP content security policy?
I am tasked with adding a content security policy to a whole bunch of Magento stores to protect against credit card scraping code, which can sneak in via the store admin or GoogleTagManager* when a ...
0
votes
1answer
293 views
Content Security Policy (CSP) alternatives
Are there any off the shelf alternatives that come close to achieving the same results as Content Security Policy (CSP)? I understand the importance of CSP but it soon becomes unmanageable with inline ...
0
votes
0answers
201 views
How to make a HTTPrequest in JSONP callback?
I'm trying an XSS challenge. I found an exploit that breaks CSP by using a JSONP callback. I can get an alert to pop up by putting something like:
<script src="https://whitelisted.jsonp?callback=...
2
votes
0answers
52 views
CSP for iFrame without any src attribute
I am looking for recommendations on how to implement our CSP policy. We have an Angular SPA application, that has an iframe without any src attribute. We populate the content of the iframe dynamically ...
1
vote
1answer
116 views
Is using default-src * safe?
I have a website to do security testing. The CSP is as follows.
default-src * ;
style-src 'self' 'unsafe-inline' data: https://netdna.bootstrapcdn.com/ http://s3.amazonaws.com/ https://s3.amazonaws....
