Preventing CSS background images from loading remotely due to content security policy restrictions

I am facing an issue where a background image loaded from a remote server is being blocked by my CSP with the following message

Content Security Policy: The page's settings blocked the loading of a resource at self ("default-src * "). Source: background-image: url('....

Here is the Content Security Policy (CSP) in question:

<meta http-equiv="Content-Security-Policy" content="default-src * https://xxxxx.com; script-src * 'unsafe-eval' 'unsafe-inline'; img-src 'self' data:">

In this CSP, the domain specified as xxxxx is the relevant one.

It seems like the issue might be caused by the use of url(..., although according to theCSP specification, url() is not considered a scheme. This leaves me unsure about how to proceed. Any suggestions or insights would be greatly appreciated.

[UPDATE]

Adding onto @sideshowbarker's comment, it should be noted that this request is originating from an inline style attribute rather than a tag.

csscontent-security-policy

Answer №1

It appears that the CSP violation message you received is due to inline CSS content. To resolve this issue, you can either relocate the CSS content to a separate file and reference it using a link element, or include 'unsafe-inline' in your policy by adding a style-src directive:

<meta http-equiv="Content-Security-Policy"
  content="default-src * https://xxxxx.com;
  script-src * 'unsafe-eval' 'unsafe-inline';
  style-src 'self' 'unsafe-inline';
  img-src 'self' https://xxxxx.com data:">

The CSP violation message does not specifically point out any issues with the image within the CSS content, but rather warns about the presence of inline styles.

It is crucial to note that your current CSP policy only allows inline scripts, as script-src is the sole directive permitting 'unsafe-inline'.

If you intend to retain the inline style content, you must include 'unsafe-inline' for it to be permitted.

Update: Following feedback below, it seems that including 'unsafe-inline' for style-src necessitates adding https://xxxxx.com to img-src as well.

In light of these considerations, when resorting to specifying 'unsafe-inline' for both style content and scripts, it might be time to reassess whether having a CSP policy is still effective—since allowing all content to be inline contradicts the purpose of having such a policy in the first place.

If your aim is to mitigate XSS vulnerabilities, transitioning all inline style/script content to separate files and leveraging <script src> and link for referencing may be a more secure approach...

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