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.
References
History
No history.
MITRE Information
Status: PUBLISHED
Assigner: GitHub_M
Published: 2023-06-26T19:50:25.212Z
Updated: 2023-06-26T19:50:25.212Z
Reserved: 2023-05-17T22:25:50.696Z
Link: CVE-2023-33176
JSON object: View
NVD Information
Status : Analyzed
Published: 2023-06-26T20:15:10.063
Modified: 2023-07-05T17:49:17.157
Link: CVE-2023-33176
JSON object: View
Redhat Information
No data.
CWE