CVE-2013-4941: YUI Uploader Component XSS Vulnerability
Summary
CVE-2013-4941: YUI Cross-site Scripting (XSS) vulnerability. Affects yui versions >= 3.2.0, <= 3.9.1. No fix is published. How to fix ↓
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Background
Yahoo! YUI (Yahoo User Interface) is a popular JavaScript library used for building interactive web applications. The Uploader component allows users to upload files through a web interface. However, certain versions of this component, specifically from 3.2.0 to 3.9.1, are vulnerable to a Cross-site Scripting (XSS) attack, which can compromise the security of applications using this library.
Vulnerability Detail
The vulnerability arises from improper handling of user input in the uploader.swf file within the Uploader component of YUI. This flaw allows remote attackers to inject arbitrary web scripts or HTML via a crafted string in a URL. If exploited, this could lead to unauthorized actions being performed on behalf of the user, data theft, or the spread of malware.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, you can sanitize user inputs and URLs before processing them in your application to mitigate the risk of XSS attacks. However, this is not a substitute for updating the affected package.
Conclusion
The YUI Uploader component has a significant XSS vulnerability that can be exploited by attackers. It is crucial for developers using affected versions to update their packages promptly to safeguard their applications and users. Utilizing tools like Vulert can help in monitoring and managing such vulnerabilities effectively.
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FAQ
XSS is a security vulnerability that allows attackers to inject malicious scripts into web pages viewed by other users.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. You can check your application against this vulnerability using the Vulert playground without any signup.
Exploiting this vulnerability can lead to unauthorized actions, data theft, or the spread of malware, compromising user security.
Yes, upgrading to a patched version of the YUI package or Moodle will resolve this vulnerability.
Implement input sanitization as a temporary measure to reduce the risk of XSS attacks until you can update the package.
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