What is CVE-2023-42803?

CVE-2023-42803 is the identifier for the BigBlueButton Unrestricted File Upload vulnerability.

What is the severity of CVE-2023-42803?

CVE-2023-42803 has a severity rating of 8.8 (high).

Which versions of BigBlueButton are affected by CVE-2023-42803?

The vulnerability affects BigBlueButton versions up to and including 2.5.18.

How can I fix CVE-2023-42803?

To fix CVE-2023-42803, you should update to a version of BigBlueButton that is not affected by the vulnerability.

Vulnerability/
CVE-2023-42803

high

8.8

CWE

434

30/10/2023

6/9/2024

CVE-2023-42803: BigBlueButton Unrestricted File Upload vulnerability

Q: How does the BigBlueButton Unrestricted File Upload vulnerability work?

The vulnerability occurs when the insertDocument API call in BigBlueButton does not properly validate the file extension before saving the file, allowing an attacker to upload malicious files.

First published: Mon Oct 30 2023(Updated: )

BigBlueButton is an open-source virtual classroom. BigBlueButton prior to version 2.6.0-beta.2 is vulnerable to unrestricted file upload, where the insertDocument API call does not validate the given file extension before saving the file, and does not remove it in case of validation failures. BigBlueButton 2.6.0-beta.2 contains a patch. There are no known workarounds.

Credit: security-advisories@github.com

Affected Software	Affected Version	How to fix
Bigbluebutton Bigbluebutton	<=2.5.18
Bigbluebutton Bigbluebutton	=2.6.0-alpha1
Bigbluebutton Bigbluebutton	=2.6.0-alpha2
Bigbluebutton Bigbluebutton	=2.6.0-alpha3
Bigbluebutton Bigbluebutton	=2.6.0-alpha4
Bigbluebutton Bigbluebutton	=2.6.0-beta1

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Reference Links

Frequently Asked Questions

What is CVE-2023-42803?
CVE-2023-42803 is the identifier for the BigBlueButton Unrestricted File Upload vulnerability.
What is the severity of CVE-2023-42803?
CVE-2023-42803 has a severity rating of 8.8 (high).
How does the BigBlueButton Unrestricted File Upload vulnerability work?
The vulnerability occurs when the insertDocument API call in BigBlueButton does not properly validate the file extension before saving the file, allowing an attacker to upload malicious files.
Which versions of BigBlueButton are affected by CVE-2023-42803?
The vulnerability affects BigBlueButton versions up to and including 2.5.18.
How can I fix CVE-2023-42803?
To fix CVE-2023-42803, you should update to a version of BigBlueButton that is not affected by the vulnerability.

collector/nvd-api
agent/weakness
agent/type
agent/severity
agent/title
agent/references
agent/author
agent/tags
agent/event
agent/description
agent/last-modified-date
agent/first-publish-date
agent/softwarecombine
collector/mitre-cve
source/MITRE
vendor/bigbluebutton
canonical/bigbluebutton bigbluebutton
version/bigbluebutton bigbluebutton/2.5.18
version/bigbluebutton bigbluebutton/2.6.0-alpha1
version/bigbluebutton bigbluebutton/2.6.0-alpha2
version/bigbluebutton bigbluebutton/2.6.0-alpha3
version/bigbluebutton bigbluebutton/2.6.0-alpha4
version/bigbluebutton bigbluebutton/2.6.0-beta1

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