Vulnerability Details : CVE-2020-26244
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.
Products affected by CVE-2020-26244
- cpe:2.3:a:python_openid_connect_project:python_openid_connect:*:*:*:*:*:*:*:*
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
-
https://github.com/OpenIDC/pyoidc/security/advisories/GHSA-4fjv-pmhg-3rfg
Client vulnerabilites to replay attack and cipher downgrade · Advisory · OpenIDC/pyoidc · GitHubThird Party Advisory
-
https://github.com/OpenIDC/pyoidc/releases/tag/1.2.1
Release Security vulnerability fix (CVE-2020-26244) · OpenIDC/pyoidc · GitHubThird Party Advisory
-
https://pypi.org/project/oic/
oic · PyPIProduct;Vendor Advisory
-
https://github.com/OpenIDC/pyoidc/commit/62f8d753fa17c8b1f29f8be639cf0b33afb02498
Merge pull request from GHSA-4fjv-pmhg-3rfg · OpenIDC/pyoidc@62f8d75 · GitHubPatch;Third Party Advisory
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