koajs cors up to 4.x origin validation

Summaryinfo

A vulnerability labeled as problematic has been found in koajs cors up to 4.x. This vulnerability affects unknown code. The manipulation results in origin validation. This vulnerability is cataloged as CVE-2023-49803. The attack may be launched remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as problematic, was found in koajs cors up to 4.x. Affected is an unknown part. The manipulation with an unknown input leads to a origin validation vulnerability. CWE is classifying the issue as CWE-346. The product does not properly verify that the source of data or communication is valid. This is going to have an impact on integrity. CVE summarizes:

@koa/cors npm provides Cross-Origin Resource Sharing (CORS) for koa, a web framework for Node.js. Prior to version 5.0.0, the middleware operates in a way that if an allowed origin is not provided, it will return an `Access-Control-Allow-Origin` header with the value of the origin from the request. This behavior completely disables one of the most crucial elements of browsers - the Same Origin Policy (SOP), this could cause a very serious security threat to the users of this middleware. If such behavior is expected, for instance, when middleware is used exclusively for prototypes and not for production applications, it should be heavily emphasized in the documentation along with an indication of the risks associated with such behavior, as many users may not be aware of it. Version 5.0.0 fixes this vulnerability.

The weakness was shared 12/12/2023 as GHSA-qxrj-hx23-xp82. The advisory is shared for download at github.com. This vulnerability is traded as CVE-2023-49803 since 11/30/2023. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available.

Upgrading to version 5.0.0 eliminates this vulnerability. Applying the patch f31dac99f5355c41e7d4dd3c4a80c5f154941a11 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• koajs

Name

• cors

Version

• 4.x

License

• open-source

Website

• Product: https://github.com/koajs/cors/

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Once again VulDB remains the best source for vulnerability data.

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