CVE-2020-27222

californium-core: DTLS - DoS vulnerability for certificate based handshakes

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

In Eclipse Californium version 2.3.0 to 2.6.0, the certificate based (x509 and RPK) DTLS handshakes accidentally fails, because the DTLS server side sticks to a wrong internal state. That wrong internal state is set by a previous certificate based DTLS handshake failure with TLS parameter mismatch. The DTLS server side must be restarted to recover this. This allow clients to force a DoS.

En Eclipse Californium versiones 2.3.0 hasta 2.6.0, los protocolos de enlace DTLS basados ??en certificados (x509 y RPK) cometen un fallo accidentalmente, porque el lado del servidor DTLS se adhiere a un estado interno equivocado. Ese estado interno equivocado es ajustado por medio de un fallo de protocolo de enlace DTLS basada en un certificado anterior con una falta de coincidencia de los parámetros TLS. El lado del servidor DTLS debe reiniciarse para recuperar esto. Esto permite a clientes forzar una DoS

A flaw was found in californium. The certificate based (x509 and RPK) DTLS handshakes fails due to the DTLS server side being set to a wrong internal state by a previous certificate based DTLS handshake failure with TLS parameter mismatch. The highest threat from this vulnerability is to system availability.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

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

2020-10-19 CVE Reserved
2021-02-03 CVE Published
2023-10-20 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-372: Incomplete Internal State Distinction

CAPEC

References (2)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://access.redhat.com/security/cve/CVE-2020-27222	2021-08-18
https://bugzilla.redhat.com/show_bug.cgi?id=1930230	2021-08-18

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Eclipse Search vendor "Eclipse"		Californium Search vendor "Eclipse" for product "Californium"				>= 2.3.0 <= 2.6.0 Search vendor "Eclipse" for product "Californium" and version " >= 2.3.0 <= 2.6.0"		-		Affected