Vue 2.5.22 is a minor release following version 2.5.21, offering subtle improvements and bug fixes for this popular JavaScript framework used to build user interfaces and single-page applications. While the core functionality remains consistent, developers will find value in the updated dependencies and potential optimizations. Examining the devDependencies, we observe that both versions share a comprehensive suite of tools for development, testing, and building, including Babel, ESLint, Webpack, and Rollup.
A notable difference lies in the dist section; version 2.5.22 has a smaller unpacked size (2,215,273 bytes) and fewer files (207) compared to 2.5.21 (3,266,961 bytes and 218 files). This suggests potential optimizations in the build process, possibly leading to a slightly smaller footprint for deployed applications. Furthermore, the release date indicates a month difference, with version 2.5.22 released in January 2019, suggesting the inclusion of bug fixes accumulated during that period. While not a major feature release, Vue 2.5.22 likely provides a more polished and stable experience for developers already using the Vue 2.5 series, particularly through dependency updates and minor performance tweaks. Users are encouranged to upgrade to benefit from the latest improvements that can improve development workflows.
All the vulnerabilities related to the version 2.5.22 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.