In short
- CVE-2020-26244 is a MEDIUM (CVSS 6.8) vulnerability affecting oic, python openid connect (python openid connect project).
- Chance of exploitation in the next 30 days (EPSS): 0.83%, higher than 57.8% of all vulnerabilities.
- Fix: update to 1.2.1 or later.
Description
Impact
- Client implementations using this library
Issues
- The IdToken signature algorithm was not checked automatically, but only if the expected algorithm was passed in as a kwarg.
- JWA
none algorithm was allowed in all flows.
oic.consumer.Consumer.parse_authz returns an unverified IdToken. The verification of the token was left to the discretion of the implementator.iat claim was not checked for sanity (i.e. it could be in the future)
Patches
- IdToken signature is now always checked.
- JWA
none algorithm is now allowed only if using the response_type code
- IdToken verification is now done automatically.
iat claim is now checked for sanity.
NVD 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.
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