ubuntu-cve-2020-11501
Vulnerability from osv_ubuntu
Published
2020-04-03 13:15
Modified
2025-07-16 04:55
Summary
Details

GnuTLS 3.6.x before 3.6.13 uses incorrect cryptography for DTLS. The earliest affected version is 3.6.3 (2018-07-16) because of an error in a 2017-10-06 commit. The DTLS client always uses 32 '\0' bytes instead of a random value, and thus contributes no randomness to a DTLS negotiation. This breaks the security guarantees of the DTLS protocol.

Severity
7.4 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "gnutls-bin",
            "binary_version": "3.4.10-4ubuntu1.7"
          },
          {
            "binary_name": "gnutls-bin-dbgsym",
            "binary_version": "3.4.10-4ubuntu1.7"
          },
          {
            "binary_name": "gnutls-doc",
            "binary_version": "3.4.10-4ubuntu1.7"
          },
          {
            "binary_name": "guile-gnutls",
            "binary_version": "3.4.10-4ubuntu1.7"
          },
          {
            "binary_name": "guile-gnutls-dbgsym",
            "binary_version": "3.4.10-4ubuntu1.7"
          },
          {
            "binary_name": "libgnutls-dev",
            "binary_version": "3.4.10-4ubuntu1.7"
          },
          {
            "binary_name": "libgnutls-openssl27",
            "binary_version": "3.4.10-4ubuntu1.7"
          },
          {
            "binary_name": "libgnutls-openssl27-dbgsym",
            "binary_version": "3.4.10-4ubuntu1.7"
          },
          {
            "binary_name": "libgnutls28-dev",
            "binary_version": "3.4.10-4ubuntu1.7"
          },
          {
            "binary_name": "libgnutls30",
            "binary_version": "3.4.10-4ubuntu1.7"
          },
          {
            "binary_name": "libgnutls30-dbgsym",
            "binary_version": "3.4.10-4ubuntu1.7"
          },
          {
            "binary_name": "libgnutlsxx28",
            "binary_version": "3.4.10-4ubuntu1.7"
          },
          {
            "binary_name": "libgnutlsxx28-dbgsym",
            "binary_version": "3.4.10-4ubuntu1.7"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "gnutls28",
        "purl": "pkg:deb/ubuntu/gnutls28@3.4.10-4ubuntu1.7?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.4.10-4ubuntu1.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.3.15-5ubuntu2",
        "3.3.18-1ubuntu1",
        "3.3.20-1ubuntu1",
        "3.4.9-2ubuntu1",
        "3.4.10-4ubuntu1",
        "3.4.10-4ubuntu1.1",
        "3.4.10-4ubuntu1.2",
        "3.4.10-4ubuntu1.3",
        "3.4.10-4ubuntu1.4",
        "3.4.10-4ubuntu1.5",
        "3.4.10-4ubuntu1.6"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "gnutls-bin",
            "binary_version": "3.5.18-1ubuntu1.3"
          },
          {
            "binary_name": "gnutls-bin-dbgsym",
            "binary_version": "3.5.18-1ubuntu1.3"
          },
          {
            "binary_name": "gnutls-doc",
            "binary_version": "3.5.18-1ubuntu1.3"
          },
          {
            "binary_name": "libgnutls-dane0",
            "binary_version": "3.5.18-1ubuntu1.3"
          },
          {
            "binary_name": "libgnutls-dane0-dbgsym",
            "binary_version": "3.5.18-1ubuntu1.3"
          },
          {
            "binary_name": "libgnutls-openssl27",
            "binary_version": "3.5.18-1ubuntu1.3"
          },
          {
            "binary_name": "libgnutls-openssl27-dbgsym",
            "binary_version": "3.5.18-1ubuntu1.3"
          },
          {
            "binary_name": "libgnutls28-dev",
            "binary_version": "3.5.18-1ubuntu1.3"
          },
          {
            "binary_name": "libgnutls30",
            "binary_version": "3.5.18-1ubuntu1.3"
          },
          {
            "binary_name": "libgnutls30-dbgsym",
            "binary_version": "3.5.18-1ubuntu1.3"
          },
          {
            "binary_name": "libgnutlsxx28",
            "binary_version": "3.5.18-1ubuntu1.3"
          },
          {
            "binary_name": "libgnutlsxx28-dbgsym",
            "binary_version": "3.5.18-1ubuntu1.3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "gnutls28",
        "purl": "pkg:deb/ubuntu/gnutls28@3.5.18-1ubuntu1.3?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.5.18-1ubuntu1.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.5.8-6ubuntu3",
        "3.5.17-1ubuntu1",
        "3.5.17-1ubuntu3",
        "3.5.18-1ubuntu1",
        "3.5.18-1ubuntu1.1",
        "3.5.18-1ubuntu1.2"
      ]
    }
  ],
  "aliases": [],
  "details": "GnuTLS 3.6.x before 3.6.13 uses incorrect cryptography for DTLS. The earliest affected version is 3.6.3 (2018-07-16) because of an error in a 2017-10-06 commit. The DTLS client always uses 32 \u0027\\0\u0027 bytes instead of a random value, and thus contributes no randomness to a DTLS negotiation. This breaks the security guarantees of the DTLS protocol.",
  "id": "UBUNTU-CVE-2020-11501",
  "modified": "2025-07-16T04:55:43Z",
  "published": "2020-04-03T13:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-11501"
    },
    {
      "type": "REPORT",
      "url": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2020-03-31"
    },
    {
      "type": "REPORT",
      "url": "https://gitlab.com/gnutls/gnutls/-/commit/5b595e8e52653f6c5726a4cdd8fddeb6e83804d2"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4322-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2020-11501"
    }
  ],
  "related": [
    "USN-4322-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2020-11501"
  ],
  "withdrawn": "2025-07-18T16:45:48Z"
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.