CVE-2020-26244

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.

How to fix CVE-2020-26244

To remediate CVE-2020-26244, upgrade the affected package to a fixed version below.

• —upgrade to 1.2.1 or later
• —upgrade to 62f8d753fa17c8b1f29f8be639cf0b33afb02498 or later

Is CVE-2020-26244 being exploited?

Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 1.2.1
• from 0, < 62f8d753fa17c8b1f29f8be639cf0b33afb02498 | from 0, < 1.2.1

CVSS scores

References (8)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2020-26244
• PATCHgithub.com/OpenIDC/pyoidc
• PATCHpypi.org/project/oic/
• WEBgithub.com/OpenIDC/pyoidc/commit/62f8d753fa17c8b1f29f8be639cf0b33afb02498
• WEB