PT-2020-16718 · Bigbluebutton · Bigbluebutton

Published 2020-10-21 · Updated 2020-10-29 · CVE-2020-27608

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions BigBlueButton versions prior to 2.2.28

Description The issue allows for XSS attacks due to uploaded presentations being sent to clients without a Content-Type header. This can be exploited by uploading an HTML document with a .png file extension, demonstrating the potential for malicious script execution.

Recommendations For versions prior to 2.2.28, update to version 2.2.28 or later to resolve the issue. As a temporary workaround, consider restricting the upload of presentations or implementing additional validation on uploaded files to minimize the risk of exploitation.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2020-27608

Affected Products

Bigbluebutton

References · 4

• 🔥 https://golem.de/news/big-blue-button-das-grosse-blaue-sicherheitsrisiko-2010-151610.html · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2020-27608 · Security Note
• https://osv.dev/vulnerability/CVE-2020-27608 · Vendor Advisory
• https://t.me/cibsecurity/15459 · Telegram Post