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CVE-2020-26244— Cryptographic issues in Python oic

Quick assessment

Affected
OpenIDC pyoidc
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Python是Python基金会的一套开源的、面向对象的程序设计语言。该语言具有可扩展、支持模块和包、支持多种平台等特点。 Python oic 1.2.1之前版本存在安全漏洞，该漏洞源于有几个相关的加密问题会影响使用该库的客户端实现。问题是:1)没有自动检查IdToken签名算法，只有当期望的算法作为kwarg传入时才会检查。2)所有流都允许JWA none 算法。3)oic.consumer.Consumer.parse_authz一个未验证的IdToken。令牌的验证由实现者自行决定。4) iat声

CVSS 6.8 · Medium EPSS 0.83% · P56

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2020-26244

Vulnerability Information
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Vulnerability Title
Cryptographic issues in Python oic
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
缺少必要的密码学步骤
Source: CVE Program / CVE List V5
Vulnerability Title
Python oic 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Python是Python基金会的一套开源的、面向对象的程序设计语言。该语言具有可扩展、支持模块和包、支持多种平台等特点。 Python oic 1.2.1之前版本存在安全漏洞，该漏洞源于有几个相关的加密问题会影响使用该库的客户端实现。问题是:1)没有自动检查IdToken签名算法，只有当期望的算法作为kwarg传入时才会检查。2)所有流都允许JWA none 算法。3)oic.consumer.Consumer.parse_authz一个未验证的IdToken。令牌的验证由实现者自行决定。4) iat声
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenIDC pyoidc < 1.2.1 -

II. Public POCs for CVE-2020-26244

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III. Intelligence Information for CVE-2020-26244

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Patches & Fixes for CVE-2020-26244 (1)

Vendor Advisories for CVE-2020-26244 (1)

Other References for CVE-2020-26244 (2)

IV. Related Vulnerabilities

Same vendor: OpenIDC
Same weakness: CWE-325

V. Comments for CVE-2020-26244

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