Strengthen the security of the index.html file within an Angular application by addressing

After running a security scan using Fortify, issues were highlighted in my application which uses an Angular front end with ASP.NET Core. One of the detected issues is related to the following line in the index.html file:

document.write('base href="'=+ document.location+'"/>');

It seems that this line is causing some concerns about security. However, as far as I understand, in a single page application like Angular, this line serves as the base container for other components and scripts to load. Is this not how an Angular SPA is supposed to function? The scan also flagged multiple lines as vulnerabilities, such as and files like main.gh9787998886.bundle.js.

How should I go about addressing these issues? Could it be possible that they are false positives?

javascriptc#angulartypescriptxss

Answer №1

Fortify often detects false positives (I believe this is just to ensure nothing is overlooked). An example of this is when there is JavaScript code like key = 'something', Fortify flags it as 'hardcoded encryption key'. I have encountered this issue multiple times in bundles where third-party components like Kendo UI exhibit similar behavior. In Fortify, you can designate them as 'third party component' and suppress these issues. Fortify will remember this for future code checks, so it only needs to be done once.

document.write('base href="'=+ document.location+'"/>');

I do not consider this a false positive. My suggestion would be to replace it with:

<base href=".">

If you are using this to accommodate different deployments, it is advisable to utilize the --baseHref option in the build command.

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