Ecosyste.ms: Advisories
An open API service providing security vulnerability metadata for many open source software ecosystems.
Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLWY0ZzktaDg5aC1qZ3Y5
SAML XML Signature wrapping in PySAML2
Impact
All users of pysaml2 that use the default CryptoBackendXmlSec1 backend and need to verify signed SAML documents are impacted. pysaml2 <= 6.4.1 does not validate the SAML document against an XML schema. This allows invalid XML documents to trick the verification process, by presenting elements with a valid signature inside elements whose content has been malformed. The verification is offloaded to xmlsec1 and xmlsec1 will not validate every signature in the given document, but only the first it finds in the given scope.
Patches
Users should upgrade to pysaml2 v6.5.0.
Workarounds
No workaround provided at this point.
References
No references provided at this point.
Credits
- Victor Schönfelder Garcia (isits AG International School of IT Security)
- Juraj Somorovsky (Paderborn University)
- Vladislav Mladenov (Ruhr University Bochum)
For more information
If you have any questions or comments about this advisory:
- Open an issue in pysaml2
- Email us at the incident-response address
JSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLWY0ZzktaDg5aC1qZ3Y5
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Low
Classification: General
Published: over 3 years ago
Updated: about 1 year ago
CVSS Score: 6.5
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Identifiers: GHSA-f4g9-h89h-jgv9, CVE-2021-21238
References:
- https://github.com/IdentityPython/pysaml2/security/advisories/GHSA-f4g9-h89h-jgv9
- https://github.com/IdentityPython/pysaml2/commit/1d8fd268f5bf887480a403a7a5ef8f048157cc14
- https://github.com/IdentityPython/pysaml2/releases/tag/v6.5.0
- https://pypi.org/project/pysaml2
- https://nvd.nist.gov/vuln/detail/CVE-2021-21238
- https://github.com/advisories/GHSA-f4g9-h89h-jgv9
Blast Radius: 16.8
Affected Packages
pypi:pysaml2
Dependent packages: 22Dependent repositories: 378
Downloads: 606,813 last month
Affected Version Ranges: < 6.5.0
Fixed in: 6.5.0
All affected versions: 0.4.3, 1.0.1, 1.0.2, 1.0.3, 1.1.0, 2.0.0, 2.1.0, 2.2.0, 2.3.0, 2.4.0, 3.0.0, 3.0.2, 4.0.0, 4.0.1, 4.0.2, 4.0.3, 4.0.4, 4.0.5, 4.1.0, 4.2.0, 4.3.0, 4.4.0, 4.5.0, 4.6.0, 4.6.1, 4.6.2, 4.6.3, 4.6.4, 4.6.5, 4.7.0, 4.8.0, 4.9.0, 5.0.0, 5.1.0, 5.2.0, 5.3.0, 5.4.0, 6.0.0, 6.1.0, 6.2.0, 6.3.0, 6.3.1, 6.4.0, 6.4.1
All unaffected versions: 6.5.0, 6.5.1, 6.5.2, 7.0.0, 7.0.1, 7.1.0, 7.1.1, 7.1.2, 7.2.0, 7.2.1, 7.3.0, 7.3.1, 7.4.0, 7.4.1, 7.4.2, 7.5.0