Prototype Pollution Vulnerability in Node Handlebars Package
Summary
UBUNTU-CVE-2021-23383: The package handlebars before 4.7.7 are vulnerable to Prototype Pollution when selecting certain compiling options to compile templates coming from an untrusted source. Affects node-handlebars versions 3:4.0.10-5. No fix is published. How to fix ↓
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Background
Node Handlebars is a popular templating engine for Node.js, allowing developers to create dynamic HTML content by embedding expressions within templates. It is widely used in web applications for rendering views. However, prior versions of Handlebars (before 4.7.7) are susceptible to a Prototype Pollution vulnerability, which can lead to security risks when processing untrusted input.
Vulnerability Detail
The vulnerability arises from the way Handlebars compiles templates. When certain compiling options are selected, it allows an attacker to manipulate the prototype of objects, potentially leading to unauthorized access or modification of application data. This can have severe ramifications, including data leakage, application crashes, or even remote code execution, depending on how the application uses the affected package.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
If immediate updating is not feasible, consider sanitizing inputs to ensure that untrusted data cannot be processed by Handlebars. This can be done by validating and escaping user inputs before passing them to the templating engine.
Conclusion
The Prototype Pollution vulnerability in the Node Handlebars package poses significant risks to applications that utilize it. It is crucial for developers to update to the latest version to ensure the security of their applications. Additionally, using tools like Vulert can help monitor and alert for such vulnerabilities in real-time.
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FAQ
Prototype Pollution is a security vulnerability that allows an attacker to manipulate the prototype of an object, potentially leading to unauthorized access or modification of data.
You can check if your application is affected by using Vulert, which monitors open-source vulnerabilities in your software. Visit Vulert Scanner to analyze your manifest file.
The consequences can range from data leakage and application crashes to remote code execution, depending on how the application utilizes the Handlebars package.
Yes, you can mitigate the risk by sanitizing and validating user inputs before they are processed by Handlebars.
The CVSS score of this vulnerability is 5.6, indicating a medium level of severity.
References
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