CVE-2021-44878

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

If an OpenID Connect provider supports the "none" algorithm (i.e., tokens with no signature), pac4j v5.3.0 (and prior) does not refuse it without an explicit configuration on its side or for the "idtoken" response type which is not secure and violates the OpenID Core Specification. The "none" algorithm does not require any signature verification when validating the ID tokens, which allows the attacker to bypass the token validation by injecting a malformed ID token using "none" as the value of "alg" key in the header with an empty signature value.

Si un proveedor de OpenID Connect soporta el algoritmo "none" (es decir, tokens sin firma), pac4j v5.3.0 (y anteriores) no lo rechaza sin una configuración explícita por su parte o para el tipo de respuesta "idtoken", que no es seguro y viola la especificación OpenID Core. El algoritmo "none" no requiere ninguna verificación de firma al validar los tokens de identificación, lo que permite al atacante saltarse la validación de tokens inyectando un token de identificación malformado utilizando "none" como valor de la clave "alg" en la cabecera con un valor de firma vacío

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-12-13 CVE Reserved
2022-01-06 CVE Published
2024-08-04 CVE Updated
2024-09-21 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-347: Improper Verification of Cryptographic Signature

CAPEC

References (3)

URL	Tag	Source
https://openid.net/specs/openid-connect-core-1_0.html#IDToken	Product

URL	Date	SRC

URL	Date	SRC
https://github.com/pac4j/pac4j/commit/22b82ffd702a132d9f09da60362fc6264fc281ae	2022-05-13

URL	Date	SRC
https://www.pac4j.org/blog/cve_2021_44878_is_this_serious.html	2022-05-13

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Pac4j Search vendor "Pac4j"		Pac4j Search vendor "Pac4j" for product "Pac4j"				< 4.5.5 Search vendor "Pac4j" for product "Pac4j" and version " < 4.5.5"		-		Affected
Pac4j Search vendor "Pac4j"		Pac4j Search vendor "Pac4j" for product "Pac4j"				>= 5.0.0 < 5.3.1 Search vendor "Pac4j" for product "Pac4j" and version " >= 5.0.0 < 5.3.1"		-		Affected