Questions tagged [content-security-policy]
This tag is for the Content-Security-Policy HTTP header. For policies in companies, use [corporate-policy].
137
questions
1
vote
1answer
34 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
26 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
39 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
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0answers
29 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 ...
1
vote
3answers
68 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
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0answers
31 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
116 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
30 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
31 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
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0answers
61 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
35 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
73 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
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0answers
65 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
69 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
160 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
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0answers
56 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 ...
2
votes
1answer
147 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
353 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
287 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
546 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
73 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
66 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
60 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 ...
1
vote
1answer
168 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 ...
1
vote
2answers
93 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
199 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
110 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
41 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 ...
0
votes
0answers
28 views
Accessing a permitted file from local file system securely
I am working on project which has more focus on user data security. Public key cryptography is being used in this and private key is getting stored to user device locally (computer local file system). ...
1
vote
1answer
90 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....
0
votes
1answer
105 views
Zero Day Policies implementation
I'm new here, and sorry if my english is a little bit broken it's not my main language.
I'm trying to put together a document/ppt for my startup with a Zero Day policy structure.
But I'm not finding ...
4
votes
1answer
3k views
CSP: What is script-src-attr and script-src-elem?
script-src-attr and script-src-elem directives are new additions in CSP3.
I am not able to understand how are they different from the script-src directive.
https://w3c.github.io/webappsec-csp/#...
0
votes
1answer
219 views
HSTS preload and requisites on domain - subdomains must be added too?
I found that the security header for protection against mitm attacks in first connection is to implement HSTS preload directive and add the list of google: https://hstspreload.org/
However the ...
3
votes
1answer
250 views
Why does Adobe recommend not setting CSP headers for its web fonts?
In this help site, Adobe recommends not setting CSP for web fonts saying:
The CSP policy does not allow you to set an exception for inline styles added by a script from a specific domain.
and
...
2
votes
1answer
513 views
Does it pose a problem to use 'strict-dynamic' with a hash and not a nonce?
Ever since CSP 3 introduced strict-dynamic, Google has recommended its usage. Indeed, the idea of maintaining one "root" script, which in turn loads all other necessary scripts, sets up event handlers,...
1
vote
1answer
179 views
If a site includes the header 'HTTP Content-Security-Policy require-sri-for' then does this include all nested scripts?
If I'm using subresource integrity on a web page and a script that I import then itself imports a further script, will the CSP 'require-sri-for' also include those subsequent, nested, imported scripts?...
0
votes
1answer
126 views
Where can I configure certificate rules on Windows 10?
This excellent SSO answer recommends to use certificate rules on Windows’ executables, as explained here by Microsoft. The latter says that the “location” of this setting is:
Computer Configuration\...
2
votes
1answer
164 views
Trying to understand Content-Security-Policy: Why do some sites (e.g Google) use a “nonce”, but also allow all inline scripts and use of eval()?
Here is an example of the CSP of accounts.google.com:
content-security-policy: script-src 'nonce-DanEwkxkS1rktq35Z1hVcg' 'unsafe-inline' 'unsafe-eval';object-src 'none';base-uri 'self';report-uri /...
2
votes
1answer
501 views
Content Security Policy: postMessage into foreign iframe
Assume we have a webpage with sensitive data. The page uses a marketing partner advertisingpartner.com which collects data via third-party cookies in a foreign iframe. We have applied a relatively ...
1
vote
0answers
253 views
How to whitelist an iframe and script of some other source embeded/ called by an iframe that is whitelisted in the CSP?
For example I am having an iframe with src https://iframe1.com which is listed in my content security policy. If the whitelisted iframe calls some iframe from another source like https://iframe2.com, ...
2
votes
1answer
1k views
Does CSP block javascript in <a href> tags?
I recently discovered that its possible to run javascript from an <a> tag like this
<a href="javascript:alert('test')">
and this gets run on the current page when clicked. It also seems ...
1
vote
2answers
3k views
Prevent javascript cross-origin redirect by window.location.href
Following this question, is there a way to prevent this code from redirecting users to domains not whitelisted?
const form = document.getElementsByTagName('form')[0];
form.addEventListener('submit', ...
24
votes
4answers
8k views
Can I trust public code versioning platforms when building a social platform?
We are developing a kind of social platform. It starts as a closed beta for a limited number of users, but the goal is to reach millions of subscriptions.
We are currently limited on resources, both ...
1
vote
1answer
91 views
Are Content-Security-Policy nonces designed for production use, or as a stop-gap when implementing a CSP?
Some websites use Content-Security-Policy nonces in order to include inline styling and script in their webpages.
Is the CSP nonce feature designed to be used for production use, or is it simply ...
1
vote
1answer
3k views
CSP - Unsafe-inline or unsafe-eval for specific domain is allowed or not
Following is a CSP policy, for example derived sample response headers.
The implementation below allows white-listed domains only in "script-src" directive but the 'unsafe-inline' and 'unsafe-eval' ...
0
votes
1answer
167 views
Prevent javascript cross-origin write
Let's assume an attacker manages to inject this script in a login page:
const form = document.getElementsByTagName('form')[0];
form.addEventListener('submit', stealCredentials);
function ...
2
votes
1answer
100 views
is there a low-overhead way to log every new file created on a Linux host?
I know about inotify but am concerned it would use too many resources.
Is there a better way to monitor a fairly static system (like a web host) for new and unexpected files being created?
3
votes
2answers
681 views
Does allowing unsafe-inline script defeat the purpose of CSP?
I am reviewing the Content-Security-Policy headers set in one of our webservers and I see this is how it is set (where 'example.com' is our trusted website).
Content-Security-Policy: "default-src '...
2
votes
2answers
380 views
Content Security Policy Header not stopping attack
I created a simple test web application to test the use of the content security policy header. I included a vulnerability in my test app, such that submitting a basic XSS payload with script tags ...
5
votes
3answers
328 views
How to safely allow scripts but preventing XSS?
We are trying to find the best way to allow JavaScript in a web application while being safe against XSS.
Site admins have the privilege to insert JavaScript to control the site templates, and ...
