Cross-Site Scripting Vulnerability in Node.js EJS Package
Summary
CVE-2017-1000188: nodejs ejs version older than 2.5.5 is vulnerable to a Cross-site-scripting in the ejs.renderFile() resulting in code injection. Affects node-ejs across 2 version ranges.
< 2.5.7-1
< 49264e0037e313a0a3e033450b5c184112516d8f
Fixed in 2.5.7-1. How to fix ↓
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Background
The EJS (Embedded JavaScript) package is a templating engine for Node.js that allows developers to generate HTML markup with plain JavaScript. It is widely used in web applications for rendering dynamic content. However, earlier versions of EJS, specifically those prior to 2.5.5, are susceptible to a critical vulnerability that can lead to code injection attacks, compromising the security of applications using this package.
Vulnerability Detail
The vulnerability, identified as CVE-2017-1000188, arises from improper handling of user input in the ejs.renderFile() function. This flaw allows an attacker to inject malicious scripts into the rendered output, potentially leading to Cross-Site Scripting (XSS) attacks. If exploited, this vulnerability can allow attackers to execute arbitrary code in the context of the user's browser, steal sensitive information, or perform actions on behalf of the user without their consent.
How To Fix
Minimum fixed version
2.5.7-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade node-ejsTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If immediate updating is not feasible, consider sanitizing user inputs before passing them to the ejs.renderFile() function. This can be done using libraries like DOMPurify or similar sanitization tools to prevent the execution of malicious scripts.
Conclusion
The vulnerability in the EJS package poses significant risks to web applications that utilize it. It is essential for developers to update to the latest version to safeguard against potential attacks. Additionally, employing input sanitization can serve as an effective temporary measure until the update is applied.
See every vulnerability recorded for node-ejs →
FAQ
CVE-2017-1000188 is a vulnerability in the EJS templating engine that allows for Cross-Site Scripting (XSS) attacks due to improper input handling.
You can use the Vulert platform to monitor and alert for open-source vulnerabilities in your software. Simply upload your manifest file like package-lock.json to check for vulnerabilities.
Exploitation of this vulnerability can lead to unauthorized code execution, data theft, and other malicious activities that compromise user security.
Yes, you can sanitize user inputs before rendering them with EJS to prevent the execution of malicious scripts.
The CVSS score for CVE-2017-1000188 is 6.1, indicating a medium severity level.
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