QID 981237

QID 981237: Nodejs (npm) Security Update for validator (GHSA-79mx-88w7-8f7q)

Versions of `validator` prior to 2.0.0 contained an xss filter method that is affected by several filter bypasses. This may result in a cross-site scripting vulnerability.

## Proof of Concept
The xss() function removes the word "javascript" when contained inside an attribute.

However, it does not properly handle cases where characters have been hex-encoded.

As a result, it is possible to build an input that bypasses the filter but which the browser will accept as valid JavaScript.

For example:
```<a href="javascript:...">abc</a>```
will render as:
```<a href="javascript:...">abc</a>```

## Recommendation

The package author has decided to remove the xss filter functionality in the latest version of this module. If this feature is not currently being used, you are not affected by the vulnerability. If it is being used, updating to the latest version of the module will break your application.

In order for affected users to mitigate this vulnerability, it is necessary to use an [alternative package](https://www.npmjs.com/search?q=xss%20filter&page=1&ranking=optimal) that provides similar functionality.

Successful exploitation of this vulnerability may affect the confidentiality, integrity, and availability of the targeted user.

CVSS V3 rated as High - 6.1 severity.

CVSS V2 rated as Medium - 4.3 severity.

Solution

Customers are advised to refer to GHSA-79mx-88w7-8f7q for updates pertaining to this vulnerability.

Vendor References

GHSA-79mx-88w7-8f7q - github.com/advisories/GHSA-79mx-88w7-8f7q

CVEs related to QID 981237

CVE-2014-9772 |

Software Advisories

Advisory ID	Software	Component	Link
GHSA-79mx-88w7-8f7q	validator		github.com/advisories/GHSA-79mx-88w7-8f7q

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