Vulnerability Name:

CVE-2020-26244 (CCN-192561)

Assigned:2020-12-01
Published:2020-12-01
Updated:2020-12-08
Summary: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.
CVSS v3 Severity:6.8 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N)
5.9 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): None
8.2 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N)
7.1 High (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): Low
Integrity (I): High
Availibility (A): None
CVSS v2 Severity:4.9 Medium (CVSS v2 Vector: AV:N/AC:M/Au:S/C:P/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): None
8.5 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:C/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Complete
Availibility (A): None
Vulnerability Type:CWE-347
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2020-26244

Source: XF
Type: UNKNOWN
pythonoic-cve202026244-sec-bypass(192561)

Source: MISC
Type: Patch, Third Party Advisory
https://github.com/OpenIDC/pyoidc/commit/62f8d753fa17c8b1f29f8be639cf0b33afb02498

Source: MISC
Type: Third Party Advisory
https://github.com/OpenIDC/pyoidc/releases/tag/1.2.1

Source: CCN
Type: Python oic GIT Repository
Client vulnerabilites to replay attack and cipher downgrade

Source: CONFIRM
Type: Third Party Advisory
https://github.com/OpenIDC/pyoidc/security/advisories/GHSA-4fjv-pmhg-3rfg

Source: MISC
Type: Product, Vendor Advisory
https://pypi.org/project/oic/

Vulnerable Configuration:Configuration 1:
  • cpe:/a:python_openid_connect_project:python_openid_connect:*:*:*:*:*:*:*:* (Version < 1.2.1)

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:113276
    P
    		python36-oic-1.2.1-1.2 on GA media (Moderate)
    2022-01-17
    oval:org.opensuse.security:def:106688
    P
    		python36-oic-1.2.1-1.2 on GA media (Moderate)
    2021-10-01
    BACK
    python_openid_connect_project python openid connect *