BigBlueButton is an open source virtual classroom designed to help teachers teach and learners learn. In affected versions are affected by a Server-Side Request Forgery (SSRF) vulnerability. In an `insertDocument` API request the user is able to supply a URL from which the presentation should be downloaded. This URL was being used without having been successfully validated first. An update to the `followRedirect` method in the `PresentationUrlDownloadService` has been made to validate all URLs to be used for presentation download. Two new properties `presentationDownloadSupportedProtocols` and `presentationDownloadBlockedHosts` have also been added to `bigbluebutton.properties` to allow administrators to define what protocols a URL must use and to explicitly define hosts that a presentation cannot be downloaded from. All URLs passed to `insertDocument` must conform to the requirements of the two previously mentioned properties. Additionally, these URLs must resolve to valid addresses, and these addresses must not be local or loopback addresses. There are no workarounds. Users are advised to upgrade to a patched version of BigBlueButton.
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Tue, 12 Nov 2024 16:15:00 +0000
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MITRE
Status: PUBLISHED
Assigner: GitHub_M
Published: 2023-06-26T19:50:25.212Z
Updated: 2024-11-12T15:18:46.803Z
Reserved: 2023-05-17T22:25:50.696Z
Link: CVE-2023-33176
Vulnrichment
Updated: 2024-08-02T15:39:35.770Z
NVD
Status : Modified
Published: 2023-06-26T20:15:10.063
Modified: 2024-11-21T08:05:03.173
Link: CVE-2023-33176
Redhat
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