Medium severity · published Oct 30, 2023
CVE-2023-43798
BigBlueButton Blind SSRF When Uploading Presentation (mitigation bypass)
5.4
CVSS
0.4%
EPSS
No
On KEV
Description
BigBlueButton is an open-source virtual classroom. BigBlueButton prior to versions 2.6.12 and 2.7.0-rc.1 is vulnerable to Server-Side Request Forgery (SSRF). This issue is a bypass of CVE-2023-33176. A patch in versions 2.6.12 and 2.7.0-rc.1 disabled follow redirect at `httpclient.execute` since the software no longer has to follow it when using `finalUrl`. There are no known workarounds. We recommend upgrading to a patched version of BigBlueButton.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 36% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BI
bigbluebutton · bigbluebutton
< 2.6.12; >= 2.7.0-alpha.1, < 2.7.0-rc.1 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-43798
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-43798
Third Party Advisory
https://github.com/bigbluebutton/bigbluebutton/pull/18494
Third Party Advisory
https://github.com/bigbluebutton/bigbluebutton/pull/18580
Third Party Advisory
https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-3q22-hph2-cff7
Third Party Advisory
https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-h98v-2h8w-99c4
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