PT-2020-17071 · Bigbluebutton · Bigbluebutton

Tiago Jacobs · Published 2020-11-19 · Updated 2020-11-30 · CVE-2020-28954

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions BigBlueButton versions prior to 2.2.29

Description The issue is related to a lack of certain parameter sanitization in the web/controllers/ApiController.groovy file. This allows for the acceptance of control characters in a user name.

Recommendations For versions prior to 2.2.29, update to version 2.2.29 or later to resolve the issue. As a temporary workaround, consider restricting the input for user names to prevent the acceptance of control characters until a patch is applied.

Fix

Improper Encoding or Escaping of Output

Weakness Enumeration

CWE-116

Related Identifiers

CVE-2020-28954

Affected Products

Bigbluebutton

References · 9

• https://github.com/bigbluebutton/bigbluebutton/commit/e59bcd0c33a6a3203c011faa8823ba2cac1e4f37 · Patch
• https://github.com/bigbluebutton/bigbluebutton/commit/5c911ddeec4493f40f42e2f137800ed4692004a4 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2020-28954 · Security Note
• https://osv.dev/vulnerability/CVE-2020-28954 · Vendor Advisory
• https://github.com/bigbluebutton/bigbluebutton/issues/10818 · Note
• https://github.com/bigbluebutton/bigbluebutton/compare/v2.2.28...v2.2.29 · Note
• https://t.me/cvenotify/6312 · Telegram Post
• https://t.me/cvenotify/5890 · Telegram Post
• https://t.me/cvenotify/5844 · Telegram Post