Vulnerability Name:

CVE-2021-21238 (CCN-195401)

Assigned:2020-12-22
Published:2021-01-20
Updated:2021-01-29
Summary:PySAML2 is a pure python implementation of SAML Version 2 Standard. PySAML2 before 6.5.0 has an improper verification of cryptographic signature vulnerability. All users of pysaml2 that need to validate signed SAML documents are impacted. The vulnerability is a variant of XML Signature wrapping because it did not validate the SAML document against an XML schema. This allowed invalid XML documents to be processed and such a document can trick pysaml2 with a wrapped signature. This is fixed in PySAML2 6.5.0.
CVSS v3 Severity:6.5 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N)
5.7 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/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): Required
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): High
Availibility (A): None
6.5 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N)
5.7 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/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): Required
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): High
Availibility (A): None
CVSS v2 Severity:4.3 Medium (CVSS v2 Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): Partial
Availibility (A): None
6.8 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:S/C:N/I:C/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): Complete
Availibility (A): None
Vulnerability Type:CWE-347
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2021-21238

Source: XF
Type: UNKNOWN
pysaml2-cve202121238-sec-bypass(195401)

Source: MISC
Type: Patch, Third Party Advisory
https://github.com/IdentityPython/pysaml2/commit/1d8fd268f5bf887480a403a7a5ef8f048157cc14

Source: MISC
Type: Third Party Advisory
https://github.com/IdentityPython/pysaml2/releases/tag/v6.5.0

Source: CCN
Type: PySAML2 GIT Repository
Processing of invalid SAML XML documents

Source: CONFIRM
Type: Third Party Advisory
https://github.com/IdentityPython/pysaml2/security/advisories/GHSA-f4g9-h89h-jgv9

Source: MISC
Type: Product, Third Party Advisory
https://pypi.org/project/pysaml2

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2021-21238

Vulnerable Configuration:Configuration 1:
  • cpe:/a:pysaml2_project:pysaml2:*:*:*:*:*:*:*:* (Version < 6.5.0)

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:113287
    P
    		python36-pysaml2-7.0.1-1.2 on GA media (Moderate)
    2022-01-17
    oval:org.opensuse.security:def:106699
    P
    		python36-pysaml2-7.0.1-1.2 on GA media (Moderate)
    2021-10-01
    oval:org.opensuse.security:def:84184
    P
    		Security update for ardana-cobbler, cassandra, cassandra-kit, crowbar-core, crowbar-openstack, documentation-suse-openstack-cloud, grafana, kibana, openstack-heat-templates, openstack-monasca-installer, openstack-nova, python-Django, python-elementpath, python-eventlet, python-py, python-pysaml2, python-six, python-xmlschema (Moderate)
    2021-07-28
    oval:org.opensuse.security:def:84643
    P
    		Security update for ardana-cobbler, cassandra, cassandra-kit, crowbar-core, crowbar-openstack, documentation-suse-openstack-cloud, grafana, kibana, openstack-heat-templates, openstack-monasca-installer, openstack-nova, python-Django, python-elementpath, python-eventlet, python-py, python-pysaml2, python-six, python-xmlschema (Moderate)
    2021-07-28
    oval:org.opensuse.security:def:88141
    P
    		Security update for ardana-neutron, ardana-swift, cassandra, crowbar-openstack, grafana, kibana, openstack-dashboard, openstack-ironic, openstack-neutron, openstack-neutron-gbp, openstack-nova, python-Django1, python-py, python-pysaml2, python-xmlschema, rubygem-activerecord-session_store, venv-openstack-keystone (Moderate)
    2021-06-11
    oval:org.opensuse.security:def:88454
    P
    		Security update for ardana-neutron, ardana-swift, cassandra, crowbar-openstack, grafana, kibana, openstack-dashboard, openstack-ironic, openstack-neutron, openstack-neutron-gbp, openstack-nova, python-Django1, python-py, python-pysaml2, python-xmlschema, rubygem-activerecord-session_store, venv-openstack-keystone (Moderate)
    2021-06-11
    BACK
    pysaml2_project pysaml2 *