Cross-site Scripting (XSS) Affecting org.webjars.npm:angular package, versions [,1.6.7)
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- published25 Dec 2017
- disclosed17 Oct 2017
- creditUnknown
Introduced: 17 Oct 2017
CVE NOT AVAILABLE CWE-79 (opens in a new tab)How to fix?
Upgrade org.webjars.npm:angular to version 1.6.7 or higher.
Overview
org.webjars.npm:angular is a WebJar for angular.
Affected versions of this package are vulnerable to Cross-site Scripting (XSS).
Browsers mutate attributes values such as 　javascript:alert(1) when they are written to the DOM via innerHTML in various vendor specific ways.
In Chrome (<62), this mutation removed the preceding "whitespace" resulting in a value that could end up being executed as JavaScript.
Here is an example of what could happen:
// Code goes here
var h1 = document.querySelector('h1');
h1.innerHTML = '<a href="　javascript:alert(1)">CLICKME</a>';
var innerHTML = h1.innerHTML;
console.log(innerHTML);
h1.innerHTML = innerHTML;
The sanitizer contains a bit of code that triggers this mutation on an inert piece of DOM, before angular sanitizes it.
Note: Chrome 62 does not appear to mutate this particular string any more, instead it just leaves the "whitespace" in place. This probably means that Chrome 62 is no longer vulnerable to this specific attack vector.