ubuntu-cve-2021-21238
Vulnerability from osv_ubuntu
Published
2021-01-21 15:15
Modified
2025-10-24 04:50
Summary
Details

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.

Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
N/A (UNKNOWN)
low
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python-pysaml2",
            "binary_version": "3.0.0-3ubuntu1.16.04.4+esm1"
          },
          {
            "binary_name": "python3-pysaml2",
            "binary_version": "3.0.0-3ubuntu1.16.04.4+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "python-pysaml2",
        "purl": "pkg:deb/ubuntu/python-pysaml2@3.0.0-3ubuntu1.16.04.4+esm1?arch=source\u0026distro=esm-infra/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.4.0-0ubuntu2",
        "3.0.0-3ubuntu1",
        "3.0.0-3ubuntu1.16.04.1",
        "3.0.0-3ubuntu1.16.04.3",
        "3.0.0-3ubuntu1.16.04.4",
        "3.0.0-3ubuntu1.16.04.4+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python-pysaml2",
            "binary_version": "4.0.2-0ubuntu3.2"
          },
          {
            "binary_name": "python3-pysaml2",
            "binary_version": "4.0.2-0ubuntu3.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "python-pysaml2",
        "purl": "pkg:deb/ubuntu/python-pysaml2@4.0.2-0ubuntu3.2?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.0.0-3ubuntu2",
        "4.0.2-0ubuntu2",
        "4.0.2-0ubuntu3",
        "4.0.2-0ubuntu3.1",
        "4.0.2-0ubuntu3.2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-pysaml2",
            "binary_version": "4.9.0-0ubuntu3.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "python-pysaml2",
        "purl": "pkg:deb/ubuntu/python-pysaml2@4.9.0-0ubuntu3.1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.5.0+dfsg1-0ubuntu2",
        "4.9.0-0ubuntu1",
        "4.9.0-0ubuntu2",
        "4.9.0-0ubuntu3",
        "4.9.0-0ubuntu3.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-pysaml2",
            "binary_version": "7.1.0-0ubuntu2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "python-pysaml2",
        "purl": "pkg:deb/ubuntu/python-pysaml2@7.1.0-0ubuntu2?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.1.0-0ubuntu2",
        "7.1.0-0ubuntu2"
      ]
    }
  ],
  "aliases": [],
  "details": "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.",
  "id": "UBUNTU-CVE-2021-21238",
  "modified": "2025-10-24T04:50:06Z",
  "published": "2021-01-21T15:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-21238"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/IdentityPython/pysaml2/security/advisories/GHSA-f4g9-h89h-jgv9"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/IdentityPython/pysaml2/releases/tag/v6.5.0"
    },
    {
      "type": "REPORT",
      "url": "https://pypi.org/project/pysaml2"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-21238"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "low",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-21238"
  ]
}



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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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