CVE-2023-33176

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Summary

CVECVE-2023-33176
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2023-06-26 20:15:00 UTC
Updated2023-07-05 17:49:00 UTC
DescriptionBigBlueButton 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.

Risk And Classification

Problem Types: CWE-918

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Bigbluebutton Bigbluebutton All All All All

References

ReferenceSourceLinkTags
fix(sec): SSRF fix by paultrudel · Pull Request #18045 · bigbluebutton/bigbluebutton · GitHub MISC github.com
Blind SSRF When Uploading Presentation · Advisory · bigbluebutton/bigbluebutton · GitHub MISC github.com
Merge pull request #18052 from paultrudel/ssrf-fix-25 · bigbluebutton/bigbluebutton@43394da · GitHub MISC github.com
Merge pull request #18045 from paultrudel/ssrf-fix · bigbluebutton/bigbluebutton@b18aff3 · GitHub MISC github.com
fix(sec): SSRF fix 2.5 by paultrudel · Pull Request #18052 · bigbluebutton/bigbluebutton · GitHub MISC github.com
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