CVE-2023-42804 BigBlueButton Path Traversal – Reading Certain File Extensions
An unauthenticated attacker can read arbitrary files with specific extensions by exploiting a path traversal vulnerability in BigBlueButton.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-42804?
CVE-2023-42804 is a low-severity path traversal vulnerability in bigbluebutton, published on 30 Oct 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
BigBlueButton is an open-source virtual classroom. BigBlueButton prior to version 2.6.0-beta.1 has a path traversal vulnerability that allows an attacker with a valid starting folder path, to traverse and read other files without authentication, assuming the files have certain extensions (txt, swf, svg, png). In version 2.6.0-beta.1, input validation was added on the parameters being passed and dangerous characters are stripped. There are no known workarounds.
Weakness: CWE-22
Which versions are affected by CVE-2023-42804?
It affects 1 product.
Products include Bigbluebutton Bigbluebutton.
How do I fix CVE-2023-42804?
No fix has been published for CVE-2023-42804 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2023-42804 being exploited?
There is no known exploitation of CVE-2023-42804 in the wild and no public exploit code.
Other vulnerabilities in bigbluebutton
Sources
Also known as GHSA-3qjg-229m-vq84.