GitStock

openidc/pyoidc · Security

Multiple cryptographic issues in Python oic

GHSA ID
GHSA-4fjv-pmhg-3rfg
CVE ID
CVE-2020-26244
Severity
high
Published
Updated
CVSS
6.8 · CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
CVSS v3
6.8 · CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
CVSS v4
7.6 · CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Description

Impact

  • Client implementations using this library

Issues

  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)

Patches

  1. IdToken signature is now always checked.
  2. JWA none algorithm is now allowed only if using the response_type code
  3. IdToken verification is now done automatically.
  4. iat claim is now checked for sanity.

CWEs

  • CWE-325 · Missing Cryptographic Step
  • CWE-347 · Improper Verification of Cryptographic Signature

References