VDB-165187 · CVE-2020-28953 · GCVE-0-2020-28953

BigBlueButton up to 2.2.28 Poll permission assignment

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
3.7	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in BigBlueButton up to 2.2.28. Affected by this vulnerability is an unknown functionality of the component Poll Handler. This manipulation causes an unknown weakness. This vulnerability is tracked as CVE-2020-28953. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in BigBlueButton up to 2.2.28. Affected by this vulnerability is an unknown functionality of the component Poll Handler. The CWE definition for the vulnerability is CWE-732. The product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors. As an impact it is known to affect integrity.

The weakness was disclosed 11/20/2020 as d2cb02b3bd670265c6b1ba003f87fc261e0ac3e1. It is possible to read the advisory at github.com. This vulnerability is known as CVE-2020-28953. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 2.2.29 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

BigBlueButton

Version

License

free

Website

Product: https://github.com/bigbluebutton/bigbluebutton/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.9
VulDB Meta Temp Score: 3.8

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 4.3
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Permission assignment
CWE: CWE-732 / CWE-275 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: BigBlueButton 2.2.29
Patch: github.com

Timelineinfo

11/19/2020 🔍
11/20/2020 +1 days 🔍
11/20/2020 +0 days 🔍
12/09/2020 +19 days 🔍

Sourcesinfo

Product: github.com

Advisory: d2cb02b3bd670265c6b1ba003f87fc261e0ac3e1
Status: Confirmed

CVE: CVE-2020-28953 (🔍)
GCVE (CVE): GCVE-0-2020-28953
GCVE (VulDB): GCVE-100-165187

Entryinfo

Created: 11/20/2020 07:08
Updated: 12/09/2020 13:12
Changes: 11/20/2020 07:08 (38), 12/09/2020 13:09 (5), 12/09/2020 13:12 (20)
Complete: 🔍
Cache ID: 216::103