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.
Published 2020-12-02 20:15:13
Updated 2020-12-08 02:37:03
Source GitHub, Inc.
View at NVD,   CVE.org

Products affected by CVE-2020-26244

Exploit prediction scoring system (EPSS) score for CVE-2020-26244

0.10%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 41 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2020-26244

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
4.9
MEDIUM AV:N/AC:M/Au:S/C:P/I:P/A:N
6.8
4.9
NIST
6.8
MEDIUM CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
1.6
5.2
NIST
6.8
MEDIUM CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
1.6
5.2
GitHub, Inc.

CWE ids for CVE-2020-26244

  • The product does not implement a required step in a cryptographic algorithm, resulting in weaker encryption than advertised by the algorithm.
    Assigned by: security-advisories@github.com (Secondary)
  • The product does not verify, or incorrectly verifies, the cryptographic signature for data.
    Assigned by:
    • nvd@nist.gov (Primary)
    • security-advisories@github.com (Secondary)

References for CVE-2020-26244

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