CVE-2021-34418

Pre-auth Null pointer crash in on-premise web console

Severity Score

5.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The login routine of the web console in the Zoom On-Premise Meeting Connector before version 4.6.239.20200613, Zoom On-Premise Meeting Connector MMR before version 4.6.239.20200613, Zoom On-Premise Recording Connector before version 3.8.42.20200905, Zoom On-Premise Virtual Room Connector before version 4.4.6344.20200612, and Zoom On-Premise Virtual Room Connector Load Balancer before version 2.5.5492.20200616 fails to validate that a NULL byte was sent while authenticating. This could lead to a crash of the login service.

La rutina de inicio de sesión de la consola web en Zoom On-Premise Meeting Connector versiones anteriores a 4.6.239.20200613, Zoom On-Premise Meeting Connector MMR versiones anteriores a 4.6.239.20200613, Zoom On-Premise Recording Connector versiones anteriores a 3.8.42. 20200905, Zoom On-Premise Virtual Room Connector versiones anteriores a 4.4.6344.20200612 y Zoom On-Premise Virtual Room Connector Load Balancer versiones anteriores a 2.5.5492.20200616, no comprueban que se haya enviado un byte NULL mientras se autentican. Esto podría conllevar un fallo en el servicio de inicio de sesión

*Credits: Jeremy Brown

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-06-09 CVE Reserved
2021-11-11 CVE Published
2024-07-28 EPSS Updated
2024-09-16 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-476: NULL Pointer Dereference

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://explore.zoom.us/en/trust/security/security-bulletin	2021-11-16

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Zoom Search vendor "Zoom"		Zoom On-premise Meeting Connector Controller Search vendor "Zoom" for product "Zoom On-premise Meeting Connector Controller"				< 4.6.239.20200613 Search vendor "Zoom" for product "Zoom On-premise Meeting Connector Controller" and version " < 4.6.239.20200613"		-		Affected
Zoom Search vendor "Zoom"		Zoom On-premise Meeting Connector Mmr Search vendor "Zoom" for product "Zoom On-premise Meeting Connector Mmr"				< 4.6.239.20200613 Search vendor "Zoom" for product "Zoom On-premise Meeting Connector Mmr" and version " < 4.6.239.20200613"		-		Affected
Zoom Search vendor "Zoom"		Zoom On-premise Recording Connector Search vendor "Zoom" for product "Zoom On-premise Recording Connector"				< 3.8.42.20200905 Search vendor "Zoom" for product "Zoom On-premise Recording Connector" and version " < 3.8.42.20200905"		-		Affected
Zoom Search vendor "Zoom"		Zoom On-premise Virtual Room Connector Search vendor "Zoom" for product "Zoom On-premise Virtual Room Connector"				< 4.4.6344.20200612 Search vendor "Zoom" for product "Zoom On-premise Virtual Room Connector" and version " < 4.4.6344.20200612"		-		Affected
Zoom Search vendor "Zoom"		Zoom On-premise Virtual Room Connector Load Balancer Search vendor "Zoom" for product "Zoom On-premise Virtual Room Connector Load Balancer"				< 2.5.5492.20200616 Search vendor "Zoom" for product "Zoom On-premise Virtual Room Connector Load Balancer" and version " < 2.5.5492.20200616"		-		Affected