Medium severity · published Oct 21, 2020
CVE-2020-27604
BigBlueButton before 2.3 does not implement LibreOffice sandboxing
6.5
CVSS
1.1%
EPSS
No
On KEV
Description
BigBlueButton before 2.3 does not implement LibreOffice sandboxing. This might make it easier for remote authenticated users to read the API shared secret in the bigbluebutton.properties file. With the API shared secret, an attacker can (for example) use api/join to join an arbitrary meeting regardless of its guestPolicy setting.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.1% · higher than 67% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BI
Bigbluebutton · Bigbluebutton
before 2.2.8 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-27604
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-27604
Product
https://docs.bigbluebutton.org/dev/api.html
Exploit
https://www.golem.de/news/big-blue-button-das-grosse-blaue-sicherheitsrisiko-2010-151610.html
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