CVE-2016-10547: Cross-Site Scripting in nunjucks
Summary
CVE-2016-10547: Cross-Site Scripting in nunjucks. Affects nunjucks versions < 2.4.3. Fixed in 2.4.3. How to fix ↓
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Background
Nunjucks is an open-source templating engine for JavaScript. It is widely used for rendering dynamic content in web applications. However, versions of nunjucks prior to 2.4.3 are vulnerable to a cross-site scripting (XSS) attack. This vulnerability occurs when specially structured user input in template variables is not properly escaped in auto-escape mode, allowing an attacker to inject malicious scripts into the rendered output.
Vulnerability Detail
The vulnerability in nunjucks allows an attacker to execute arbitrary JavaScript code in the context of a victim's browser. By crafting a template variable with specially structured input, such as using an array for the keys, the escaping mechanism can be bypassed. This enables an attacker to inject malicious scripts that will be executed when the template is rendered. The impact of this vulnerability can range from stealing sensitive user information to performing actions on behalf of the victim.
How To Fix
Minimum fixed version
2.4.3
This is the first release that contains the fix.
npm install nunjucks@2.4.3Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If updating nunjucks is not immediately feasible, a temporary workaround is to manually sanitize user input before passing it to the template. This can be done using a library like DOMPurify to sanitize the input and ensure that any potentially malicious scripts are neutralized.
Conclusion
The vulnerability in nunjucks can lead to cross-site scripting attacks, allowing attackers to execute arbitrary JavaScript code in the context of a victim's browser. It is crucial to update nunjucks to the latest version or apply manual input sanitization to prevent exploitation. For further support on vulnerability remediation, please contact DevNack.com.
See every vulnerability recorded for nunjucks →
FAQ
Nunjucks is a templating engine for JavaScript that allows developers to generate dynamic content in web applications.
Cross-site scripting is a type of security vulnerability that allows attackers to inject malicious scripts into web pages viewed by other users.
The vulnerability occurs when nunjucks fails to properly escape specially structured user input in template variables, allowing an attacker to inject malicious scripts.
An attacker can execute arbitrary JavaScript code in the victim's browser, potentially stealing sensitive information or performing actions on behalf of the victim.
To fix this vulnerability, update nunjucks to version 2.4.3 or later. Alternatively, manually sanitize user input before passing it to the template.
Related vulnerabilities
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