Vulnerability-Lookup

usn-6539-1

Vulnerability from osv_ubuntu

Published

2023-12-06 15:22

Modified

2026-04-27 14:11

Summary

python-cryptography vulnerabilities

Details

It was discovered that the python-cryptography Cipher.update_into function would incorrectly accept objects with immutable buffers. This would result in corrupted output, contrary to expectations. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, and Ubuntu 23.04. (CVE-2023-23931)

It was dicovered that python-cryptography incorrectly handled loading certain PKCS7 certificates. A remote attacker could possibly use this issue to cause python-cryptography to crash, resulting in a denial of service. This issue only affected Ubuntu 22.04 LTS, Ubuntu 23.04, and Ubuntu 23.10. (CVE-2023-49083)

References

URL

Type

	https://ubuntu.com/security/notices/USN-6539-1	ADVISORY
	https://ubuntu.com/security/CVE-2023-23931	REPORT
	https://ubuntu.com/security/CVE-2023-49083	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2023-23931",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:20.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "python-cryptography",
            "binary_version": "2.8-3ubuntu0.2"
          },
          {
            "binary_name": "python3-cryptography",
            "binary_version": "2.8-3ubuntu0.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "python-cryptography",
        "purl": "pkg:deb/ubuntu/python-cryptography@2.8-3ubuntu0.2?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.8-3ubuntu0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.6.1-3.1",
        "2.6.1-4",
        "2.6.1-4ubuntu1",
        "2.8-1ubuntu2",
        "2.8-2",
        "2.8-3",
        "2.8-3ubuntu0.1"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2023-23931",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2023-49083",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:22.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "python3-cryptography",
            "binary_version": "3.4.8-1ubuntu2.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "python-cryptography",
        "purl": "pkg:deb/ubuntu/python-cryptography@3.4.8-1ubuntu2.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.4.8-1ubuntu2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.3.2-1",
        "3.3.2-1build1",
        "3.4.8-1",
        "3.4.8-1ubuntu1",
        "3.4.8-1ubuntu2"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that the python-cryptography Cipher.update_into function\nwould incorrectly accept objects with immutable buffers. This would result\nin corrupted output, contrary to expectations. This issue only affected\nUbuntu 20.04 LTS, Ubuntu 22.04 LTS, and Ubuntu 23.04. (CVE-2023-23931)\n\nIt was dicovered that python-cryptography incorrectly handled loading\ncertain PKCS7 certificates. A remote attacker could possibly use this\nissue to cause python-cryptography to crash, resulting in a denial of\nservice. This issue only affected Ubuntu 22.04 LTS, Ubuntu 23.04, and\nUbuntu 23.10. (CVE-2023-49083)\n",
  "id": "USN-6539-1",
  "modified": "2026-04-27T14:11:32Z",
  "published": "2023-12-06T15:22:41Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-6539-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2023-23931"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2023-49083"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "python-cryptography vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2023-23931",
    "UBUNTU-CVE-2023-49083"
  ]
}

ubuntu-cve-2023-23931

Vulnerability from osv_ubuntu

Published

2023-02-07 21:15

Modified

2026-04-28 15:42

Summary

Details

cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. In affected versions Cipher.update_into would accept Python objects which implement the buffer protocol, but provide only immutable buffers. This would allow immutable objects (such as bytes) to be mutated, thus violating fundamental rules of Python and resulting in corrupted output. This now correctly raises an exception. This issue has been present since update_into was originally introduced in cryptography 1.8.

Severity

4.8 (Medium)


                    
                      CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L

6.5 (Medium)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

N/A (UNKNOWN)

low

References

URL

Type

	https://ubuntu.com/security/CVE-2023-23931	REPORT
	https://github.com/pyca/cryptography/security/adv…	REPORT
	https://github.com/pyca/cryptography/pull/8230/co…	REPORT
	https://ubuntu.com/security/notices/USN-6539-1	ADVISORY
	https://www.cve.org/CVERecord?id=CVE-2023-23931	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python-cryptography",
            "binary_version": "2.1.4-1ubuntu1.4+esm3"
          },
          {
            "binary_name": "python3-cryptography",
            "binary_version": "2.1.4-1ubuntu1.4+esm3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "python-cryptography",
        "purl": "pkg:deb/ubuntu/python-cryptography@2.1.4-1ubuntu1.4+esm3?arch=source\u0026distro=esm-infra/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.9-1",
        "2.1.3-3",
        "2.1.4-1",
        "2.1.4-1build1",
        "2.1.4-1build2",
        "2.1.4-1ubuntu1",
        "2.1.4-1ubuntu1.1",
        "2.1.4-1ubuntu1.2",
        "2.1.4-1ubuntu1.3",
        "2.1.4-1ubuntu1.4",
        "2.1.4-1ubuntu1.4+esm1",
        "2.1.4-1ubuntu1.4+esm3"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "python-cryptography",
            "binary_version": "2.8-3ubuntu0.2"
          },
          {
            "binary_name": "python3-cryptography",
            "binary_version": "2.8-3ubuntu0.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "python-cryptography",
        "purl": "pkg:deb/ubuntu/python-cryptography@2.8-3ubuntu0.2?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.8-3ubuntu0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.6.1-3.1",
        "2.6.1-4",
        "2.6.1-4ubuntu1",
        "2.8-1ubuntu2",
        "2.8-2",
        "2.8-3",
        "2.8-3ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "python3-cryptography",
            "binary_version": "3.4.8-1ubuntu2.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "python-cryptography",
        "purl": "pkg:deb/ubuntu/python-cryptography@3.4.8-1ubuntu2.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.4.8-1ubuntu2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.3.2-1",
        "3.3.2-1build1",
        "3.4.8-1",
        "3.4.8-1ubuntu1",
        "3.4.8-1ubuntu2"
      ]
    }
  ],
  "aliases": [],
  "details": "cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. In affected versions `Cipher.update_into` would accept Python objects which implement the buffer protocol, but provide only immutable buffers. This would allow immutable objects (such as `bytes`) to be mutated, thus violating fundamental rules of Python and resulting in corrupted output. This now correctly raises an exception. This issue has been present since `update_into` was originally introduced in cryptography 1.8.",
  "id": "UBUNTU-CVE-2023-23931",
  "modified": "2026-04-28T15:42:23Z",
  "published": "2023-02-07T21:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2023-23931"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/pyca/cryptography/security/advisories/GHSA-w7pp-m8wf-vj6r"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/pyca/cryptography/pull/8230/commits/94a50a9731f35405f0357fa5f3b177d46a726ab3"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-6539-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-23931"
    }
  ],
  "related": [
    "USN-6539-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "low",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2023-23931"
  ]
}

ubuntu-cve-2023-49083

Vulnerability from osv_ubuntu

Published

2023-12-04 00:00

Modified

2025-09-08 16:56

Summary

Details

cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Calling load_pem_pkcs7_certificates or load_der_pkcs7_certificates could lead to a NULL-pointer dereference and segfault. Exploitation of this vulnerability poses a serious risk of Denial of Service (DoS) for any application attempting to deserialize a PKCS7 blob/certificate. The consequences extend to potential disruptions in system availability and stability. This vulnerability has been patched in version 41.0.6.

Severity

7.5 (High)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

5.9 (Medium)


                    
                      CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2023-49083	REPORT
	https://github.com/pyca/cryptography/security/adv…	REPORT
	http://www.openwall.com/lists/oss-security/2023/11/29/2	REPORT
	https://ubuntu.com/security/notices/USN-6539-1	ADVISORY
	https://www.cve.org/CVERecord?id=CVE-2023-49083	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "python3-cryptography",
            "binary_version": "3.4.8-1ubuntu2.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "python-cryptography",
        "purl": "pkg:deb/ubuntu/python-cryptography@3.4.8-1ubuntu2.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.4.8-1ubuntu2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.3.2-1",
        "3.3.2-1build1",
        "3.4.8-1",
        "3.4.8-1ubuntu1",
        "3.4.8-1ubuntu2"
      ]
    }
  ],
  "aliases": [],
  "details": "cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Calling `load_pem_pkcs7_certificates` or `load_der_pkcs7_certificates` could lead to a NULL-pointer dereference and segfault. Exploitation of this vulnerability poses a serious risk of Denial of Service (DoS) for any application attempting to deserialize a PKCS7 blob/certificate. The consequences extend to potential disruptions in system availability and stability. This vulnerability has been patched in version 41.0.6.",
  "id": "UBUNTU-CVE-2023-49083",
  "modified": "2025-09-08T16:56:36Z",
  "published": "2023-12-04T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2023-49083"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/pyca/cryptography/security/advisories/GHSA-jfhm-5ghh-2f97"
    },
    {
      "type": "REPORT",
      "url": "http://www.openwall.com/lists/oss-security/2023/11/29/2"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-6539-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-49083"
    }
  ],
  "related": [
    "USN-6539-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2023-49083"
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

usn-6539-1

Vulnerability from osv_ubuntu

ubuntu-cve-2023-23931

Vulnerability from osv_ubuntu

ubuntu-cve-2023-49083

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature