CVE-2020-26244

Cryptographic issues in Python oic

Severity Score

6.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Python oic is a Python OpenID Connect implementation. In Python oic before version 1.2.1, there are several related cryptographic issues affecting client implementations that use the library. The issues are: 1) The IdToken signature algorithm was not checked automatically, but only if the expected algorithm was passed in as a kwarg. 2) JWA `none` algorithm was allowed in all flows. 3) oic.consumer.Consumer.parse_authz returns an unverified IdToken. The verification of the token was left to the discretion of the implementator. 4) iat claim was not checked for sanity (i.e. it could be in the future). These issues are patched in version 1.2.1.

Python oic es una implementación de Python OpenID Connect. En Python oic versiones anteriores a 1.2.1, se presentan varios problemas criptográficos relacionados que afectan las implementaciones de los clientes que usan la biblioteca. Los problemas son: 1) El algoritmo de firma IdToken no se comprobó automáticamente, sino solo si el algoritmo esperado era pasado como un kwarg. 2) Se permitió el algoritmo JWA "none" en todos los flujos. 3) oic.consumer.Consumer.parse_authz devuelve un IdToken no verificado. La comprobación del token se dejó a discreción del implementador. 4) el reclamo de iat no se comprobó por sanidad (es decir, podría ser en el futuro). Estos problemas están parcheados en la versión 1.2.1

*Credits: N/A

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

Medium

Authentication

Single

Confidentiality

Partial

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-10-01 CVE Reserved
2020-12-02 CVE Published
2023-03-07 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-325: Missing Cryptographic Step
CWE-347: Improper Verification of Cryptographic Signature

CAPEC

References (4)

URL	Tag	Source
https://github.com/OpenIDC/pyoidc/releases/tag/1.2.1	Third Party Advisory
https://github.com/OpenIDC/pyoidc/security/advisories/GHSA-4fjv-pmhg-3rfg	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://github.com/OpenIDC/pyoidc/commit/62f8d753fa17c8b1f29f8be639cf0b33afb02498	2020-12-08

URL	Date	SRC
https://pypi.org/project/oic	2020-12-08

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Python Openid Connect Project Search vendor "Python Openid Connect Project"		Python Openid Connect Search vendor "Python Openid Connect Project" for product "Python Openid Connect"				< 1.2.1 Search vendor "Python Openid Connect Project" for product "Python Openid Connect" and version " < 1.2.1"		-		Affected