A vulnerability was found in Discourse up to 3.1.0.beta2. It has been rated as critical. This issue affects an unknown functionality of the component FastImage. The manipulation with an unknown input leads to a server-side request forgery vulnerability. Using CWE to declare the problem leads to CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Discourse is an open-source discussion platform. Prior to version 3.1.0.beta3 of the `beta` and `tests-passed` branches, some user provided URLs were being passed to FastImage without SSRF protection. Insufficient protections could enable attackers to trigger outbound network connections from the Discourse server to private IP addresses. This affects any site running the `tests-passed` or `beta` branches versions 3.1.0.beta2 and prior. This issue is patched in version 3.1.0.beta3 of the `beta` and `tests-passed` branches. There are no known workarounds.

The weakness was presented 03/18/2023 as GHSA-9897-x229-55gh. It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2023-28112 since 03/10/2023. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 3.1.0.beta3 eliminates this vulnerability. Applying the patch 39c2f63b35d90ebaf67b9604cf1d424e5984203c 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.

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• Discourse

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• open-source

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