ubuntu-cve-2021-3716
Vulnerability from osv_ubuntu
Published
2022-03-02 23:15
Modified
2026-05-20 14:52
Summary
Details

A flaw was found in nbdkit due to to improperly caching plaintext state across the STARTTLS encryption boundary. A MitM attacker could use this flaw to inject a plaintext NBD_OPT_STRUCTURED_REPLY before proxying everything else a client sends to the server, potentially leading the client to terminate the NBD session. The highest threat from this vulnerability is to system availability.

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

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "nbdkit",
            "binary_version": "1.1.11-1build1"
          },
          {
            "binary_name": "nbdkit-plugin-guestfs",
            "binary_version": "1.1.11-1build1"
          },
          {
            "binary_name": "nbdkit-plugin-libvirt",
            "binary_version": "1.1.11-1build1"
          },
          {
            "binary_name": "nbdkit-plugin-perl",
            "binary_version": "1.1.11-1build1"
          },
          {
            "binary_name": "nbdkit-plugin-python",
            "binary_version": "1.1.11-1build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "nbdkit",
        "purl": "pkg:deb/ubuntu/nbdkit@1.1.11-1build1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.1.10-1",
        "1.1.11-1",
        "1.1.11-1build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "nbdkit",
            "binary_version": "1.16.2-1ubuntu3"
          },
          {
            "binary_name": "nbdkit-plugin-guestfs",
            "binary_version": "1.16.2-1ubuntu3"
          },
          {
            "binary_name": "nbdkit-plugin-libvirt",
            "binary_version": "1.16.2-1ubuntu3"
          },
          {
            "binary_name": "nbdkit-plugin-lua",
            "binary_version": "1.16.2-1ubuntu3"
          },
          {
            "binary_name": "nbdkit-plugin-perl",
            "binary_version": "1.16.2-1ubuntu3"
          },
          {
            "binary_name": "nbdkit-plugin-python",
            "binary_version": "1.16.2-1ubuntu3"
          },
          {
            "binary_name": "nbdkit-plugin-ruby",
            "binary_version": "1.16.2-1ubuntu3"
          },
          {
            "binary_name": "nbdkit-plugin-tcl",
            "binary_version": "1.16.2-1ubuntu3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "nbdkit",
        "purl": "pkg:deb/ubuntu/nbdkit@1.16.2-1ubuntu3?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.12.4-1",
        "1.12.4-1build1",
        "1.14.2-3",
        "1.16.1-2",
        "1.16.1-3",
        "1.16.1-3ubuntu1",
        "1.16.2-1ubuntu1",
        "1.16.2-1ubuntu2",
        "1.16.2-1ubuntu3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "nbdkit",
            "binary_version": "1.24.1-2ubuntu4"
          },
          {
            "binary_name": "nbdkit-plugin-guestfs",
            "binary_version": "1.24.1-2ubuntu4"
          },
          {
            "binary_name": "nbdkit-plugin-libvirt",
            "binary_version": "1.24.1-2ubuntu4"
          },
          {
            "binary_name": "nbdkit-plugin-lua",
            "binary_version": "1.24.1-2ubuntu4"
          },
          {
            "binary_name": "nbdkit-plugin-perl",
            "binary_version": "1.24.1-2ubuntu4"
          },
          {
            "binary_name": "nbdkit-plugin-python",
            "binary_version": "1.24.1-2ubuntu4"
          },
          {
            "binary_name": "nbdkit-plugin-ruby",
            "binary_version": "1.24.1-2ubuntu4"
          },
          {
            "binary_name": "nbdkit-plugin-tcl",
            "binary_version": "1.24.1-2ubuntu4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "nbdkit",
        "purl": "pkg:deb/ubuntu/nbdkit@1.24.1-2ubuntu4?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.24.1-2ubuntu1",
        "1.24.1-2ubuntu2",
        "1.24.1-2ubuntu3",
        "1.24.1-2ubuntu4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "nbdkit",
            "binary_version": "1.36.3-1ubuntu10"
          },
          {
            "binary_name": "nbdkit-plugin-guestfs",
            "binary_version": "1.36.3-1ubuntu10"
          },
          {
            "binary_name": "nbdkit-plugin-libvirt",
            "binary_version": "1.36.3-1ubuntu10"
          },
          {
            "binary_name": "nbdkit-plugin-lua",
            "binary_version": "1.36.3-1ubuntu10"
          },
          {
            "binary_name": "nbdkit-plugin-perl",
            "binary_version": "1.36.3-1ubuntu10"
          },
          {
            "binary_name": "nbdkit-plugin-python",
            "binary_version": "1.36.3-1ubuntu10"
          },
          {
            "binary_name": "nbdkit-plugin-ruby",
            "binary_version": "1.36.3-1ubuntu10"
          },
          {
            "binary_name": "nbdkit-plugin-tcl",
            "binary_version": "1.36.3-1ubuntu10"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "nbdkit",
        "purl": "pkg:deb/ubuntu/nbdkit@1.36.3-1ubuntu10?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.34.4-1ubuntu1",
        "1.36.1-1ubuntu1",
        "1.36.2-1ubuntu1",
        "1.36.3-1ubuntu2",
        "1.36.3-1ubuntu3",
        "1.36.3-1ubuntu9",
        "1.36.3-1ubuntu10"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "nbdkit",
            "binary_version": "1.42.6-1ubuntu1"
          },
          {
            "binary_name": "nbdkit-plugin-guestfs",
            "binary_version": "1.42.6-1ubuntu1"
          },
          {
            "binary_name": "nbdkit-plugin-libvirt",
            "binary_version": "1.42.6-1ubuntu1"
          },
          {
            "binary_name": "nbdkit-plugin-lua",
            "binary_version": "1.42.6-1ubuntu1"
          },
          {
            "binary_name": "nbdkit-plugin-perl",
            "binary_version": "1.42.6-1ubuntu1"
          },
          {
            "binary_name": "nbdkit-plugin-python",
            "binary_version": "1.42.6-1ubuntu1"
          },
          {
            "binary_name": "nbdkit-plugin-tcl",
            "binary_version": "1.42.6-1ubuntu1"
          },
          {
            "binary_name": "nbdkit-plugin-vddk",
            "binary_version": "1.42.6-1ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "nbdkit",
        "purl": "pkg:deb/ubuntu/nbdkit@1.42.6-1ubuntu1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.42.2-1ubuntu1",
        "1.42.3-1ubuntu1",
        "1.42.4-1ubuntu1",
        "1.42.6-1ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "nbdkit",
            "binary_version": "1.46.2-1ubuntu2"
          },
          {
            "binary_name": "nbdkit-plugin-guestfs",
            "binary_version": "1.46.2-1ubuntu2"
          },
          {
            "binary_name": "nbdkit-plugin-libvirt",
            "binary_version": "1.46.2-1ubuntu2"
          },
          {
            "binary_name": "nbdkit-plugin-lua",
            "binary_version": "1.46.2-1ubuntu2"
          },
          {
            "binary_name": "nbdkit-plugin-perl",
            "binary_version": "1.46.2-1ubuntu2"
          },
          {
            "binary_name": "nbdkit-plugin-python",
            "binary_version": "1.46.2-1ubuntu2"
          },
          {
            "binary_name": "nbdkit-plugin-tcl",
            "binary_version": "1.46.2-1ubuntu2"
          },
          {
            "binary_name": "nbdkit-plugin-vddk",
            "binary_version": "1.46.2-1ubuntu2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "nbdkit",
        "purl": "pkg:deb/ubuntu/nbdkit@1.46.2-1ubuntu2?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.42.6-1ubuntu1",
        "1.42.9-1ubuntu1",
        "1.42.9-1ubuntu2",
        "1.46.2-1ubuntu2"
      ]
    }
  ],
  "aliases": [],
  "details": "A flaw was found in nbdkit due to to improperly caching plaintext state across the STARTTLS encryption boundary. A MitM attacker could use this flaw to inject a plaintext NBD_OPT_STRUCTURED_REPLY before proxying everything else a client sends to the server, potentially leading the client to terminate the NBD session. The highest threat from this vulnerability is to system availability.",
  "id": "UBUNTU-CVE-2021-3716",
  "modified": "2026-05-20T14:52:55Z",
  "published": "2022-03-02T23:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-3716"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2021-3716"
    },
    {
      "type": "REPORT",
      "url": "https://listman.redhat.com/archives/libguestfs/2021-August/msg00077.html"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-3716"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-3716"
  ]
}



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.