Vue.js version 2.6.6 is a minor update following version 2.6.5 in the popular JavaScript framework for building user interfaces. Both versions share the same core description: a reactive, component-oriented view layer designed for modern web development. From a developer's standpoint, the core functionality and API remain consistent, ensuring a relatively seamless upgrade. The devDependencies sections are identical which suggests that the core architecture has not changed.
The key differences lie in the details of the release. The releaseDate shows that version 2.6.6 was released on February 12, 2019, a single day after 2.6.5. The dist section reveals a slight difference in unpackedSize. Version 2.6.6 has size of 2949514, while version 2.6.5 has 2946639. This suggests minor bug fixes, performance improvements, or very small internal adjustments.
For developers contemplating an upgrade, it's recommended to review the changelog to get specific information about internal adjustments made, looking for bug fixes that directly target problems they may have encountered. For new projects, using the latest stable version (2.6.6 in this case) is generally advisable.
All the vulnerabilities related to the version 2.6.6 of the package
ReDoS vulnerability in vue package that is exploitable through inefficient regex evaluation in the parseHTML function
The ReDoS can be exploited through the parseHTML function in the html-parser.ts file. This flaw allows attackers to slow down the application by providing specially crafted input that causes inefficient processing of regular expressions, leading to excessive resource consumption.
To demonstrate this vulnerability, here's an example. In a Vue client-side application, create a new Vue instance with a template string that includes a <script> tag but closes it incorrectly with something like </textarea>.
new Vue({
el: '#app',
template: '
<div>
Hello, world!
<script>${'<'.repeat(1000000)}</textarea>
</div>'
});
Next, set up a basic HTML page (e.g., index.html) to load this JavaScript and mount the Vue instance:
<!DOCTYPE html>
<html>
<head>
<title>My first Vue app</title>
</head>
<body>
<div id=\"app\">Loading...</div>
</body>
</html>
When you visit the app in your browser at http://localhost:3000, you'll notice that the time taken to parse and mount the Vue application increases significantly due to the ReDoS vulnerability, demonstrating how the flaw can affect performance.