ubuntu-cve-2020-8631
Vulnerability from osv_ubuntu
Published
2020-02-05 14:15
Modified
2025-09-08 16:45
Summary
Details

cloud-init through 19.4 relies on Mersenne Twister for a random password, which makes it easier for attackers to predict passwords, because rand_str in cloudinit/util.py calls the random.choice function.

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

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "cloud-init",
            "binary_version": "21.1-19-gbad84ad4-0ubuntu1~16.04.4+esm2"
          },
          {
            "binary_name": "ec2-init",
            "binary_version": "21.1-19-gbad84ad4-0ubuntu1~16.04.4+esm2"
          },
          {
            "binary_name": "grub-legacy-ec2",
            "binary_version": "21.1-19-gbad84ad4-0ubuntu1~16.04.4+esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "cloud-init",
        "purl": "pkg:deb/ubuntu/cloud-init@21.1-19-gbad84ad4-0ubuntu1~16.04.4+esm2?arch=source\u0026distro=esm-infra/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.7.7~bzr1149-0ubuntu1",
        "0.7.7~bzr1154-0ubuntu1",
        "0.7.7~bzr1155-0ubuntu1",
        "0.7.7~bzr1156-0ubuntu1",
        "0.7.7~bzr1156-0ubuntu2",
        "0.7.7~bzr1160-0ubuntu1",
        "0.7.7~bzr1176-0ubuntu1",
        "0.7.7~bzr1182-0ubuntu1",
        "0.7.7~bzr1189-0ubuntu1",
        "0.7.7~bzr1192-0ubuntu1",
        "0.7.7~bzr1192-0ubuntu2",
        "0.7.7~bzr1200-0ubuntu1",
        "0.7.7~bzr1208-0ubuntu1",
        "0.7.7~bzr1209-0ubuntu1",
        "0.7.7~bzr1212-0ubuntu1",
        "0.7.7~bzr1246-0ubuntu1~16.04.1",
        "0.7.7~bzr1256-0ubuntu1~16.04.1",
        "0.7.8-1-g3705bb5-0ubuntu1~16.04.1",
        "0.7.8-1-g3705bb5-0ubuntu1~16.04.3",
        "0.7.8-49-g9e904bb-0ubuntu1~16.04.1",
        "0.7.8-49-g9e904bb-0ubuntu1~16.04.2",
        "0.7.8-49-g9e904bb-0ubuntu1~16.04.3",
        "0.7.8-49-g9e904bb-0ubuntu1~16.04.4",
        "0.7.9-0ubuntu1~16.04.2",
        "0.7.9-48-g1c795b9-0ubuntu1~16.04.1",
        "0.7.9-90-g61eb03fe-0ubuntu1~16.04.1",
        "0.7.9-113-g513e99e0-0ubuntu1~16.04.1",
        "0.7.9-153-g16a7302f-0ubuntu1~16.04.1",
        "0.7.9-153-g16a7302f-0ubuntu1~16.04.2",
        "0.7.9-233-ge586fe35-0ubuntu1~16.04.1",
        "0.7.9-233-ge586fe35-0ubuntu1~16.04.2",
        "17.1-27-geb292c18-0ubuntu1~16.04.1",
        "17.1-46-g7acc9e68-0ubuntu1~16.04.1",
        "17.2-35-gf576b2a2-0ubuntu1~16.04.2",
        "18.2-4-g05926e48-0ubuntu1~16.04.1",
        "18.2-4-g05926e48-0ubuntu1~16.04.2",
        "18.3-9-g2e62cb8a-0ubuntu1~16.04.2",
        "18.4-0ubuntu1~16.04.2",
        "18.5-21-g8ee294d5-0ubuntu1~16.04.1",
        "18.5-45-g3554ffe8-0ubuntu1~16.04.1",
        "19.1-1-gbaa47854-0ubuntu1~16.04.1",
        "19.2-24-ge7881d5c-0ubuntu1~16.04.1",
        "19.2-36-g059d049c-0ubuntu1~16.04.1",
        "19.2-36-g059d049c-0ubuntu2~16.04.1",
        "19.3-41-gc4735dd3-0ubuntu1~16.04.1",
        "19.4-33-gbb4131a2-0ubuntu1~16.04.1",
        "20.2-45-g5f7825e2-0ubuntu1~16.04.1",
        "20.3-2-g371b392c-0ubuntu1~16.04.1",
        "20.4-0ubuntu1~16.04.1",
        "20.4-0ubuntu1~16.04.2",
        "20.4.1-0ubuntu1~16.04.1",
        "21.1-19-gbad84ad4-0ubuntu1~16.04.1",
        "21.1-19-gbad84ad4-0ubuntu1~16.04.2",
        "21.1-19-gbad84ad4-0ubuntu1~16.04.4",
        "21.1-19-gbad84ad4-0ubuntu1~16.04.4+esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "cloud-init",
            "binary_version": "20.2-45-g5f7825e2-0ubuntu1~18.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "cloud-init",
        "purl": "pkg:deb/ubuntu/cloud-init@20.2-45-g5f7825e2-0ubuntu1~18.04.1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "20.2-45-g5f7825e2-0ubuntu1~18.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "17.1-18-gd4f70470-0ubuntu1",
        "17.1-25-g17a15f9e-0ubuntu1~17.10.1",
        "17.1-25-g17a15f9e-0ubuntu1",
        "17.1-27-geb292c18-0ubuntu1",
        "17.1-41-g76243487-0ubuntu1",
        "17.1-46-g7acc9e68-0ubuntu1",
        "17.1-51-g05b2308a-0ubuntu1",
        "17.1-53-ga5dc0f42-0ubuntu1",
        "17.1-58-g703241a3-0ubuntu1",
        "17.1-60-ga30a3bb5-0ubuntu1",
        "17.2-1-g4089e20c-0ubuntu1",
        "17.2-9-gdf24daa8-0ubuntu1",
        "17.2-13-g6299e8d0-0ubuntu1",
        "17.2-20-g32a6a176-0ubuntu1",
        "17.2-25-gc03bdd3d-0ubuntu1",
        "17.2-30-gf7deaf15-0ubuntu1",
        "17.2-34-g644048e3-0ubuntu1",
        "18.1-0ubuntu1",
        "18.1-5-g40e77380-0ubuntu1",
        "18.1-17-g97012fbb-0ubuntu1",
        "18.1-23-gde34dc7c-0ubuntu1",
        "18.1-26-g685f9901-0ubuntu1",
        "18.1-35-ge0f644b7-0ubuntu1",
        "18.1-35-ge0f644b7-0ubuntu2",
        "18.2-0ubuntu1",
        "18.2-4-g05926e48-0ubuntu1",
        "18.2-4-g05926e48-0ubuntu2",
        "18.2-9-g49b562c9-0ubuntu1",
        "18.2-14-g6d48d265-0ubuntu1",
        "18.2-27-g6ef92c98-0ubuntu1~18.04.1",
        "18.3-9-g2e62cb8a-0ubuntu1~18.04.2",
        "18.4-0ubuntu1~18.04.1",
        "18.5-21-g8ee294d5-0ubuntu1~18.04.1",
        "18.5-45-g3554ffe8-0ubuntu1~18.04.1",
        "19.1-1-gbaa47854-0ubuntu1~18.04.1",
        "19.2-24-ge7881d5c-0ubuntu1~18.04.1",
        "19.2-36-g059d049c-0ubuntu1~18.04.1",
        "19.2-36-g059d049c-0ubuntu2~18.04.1",
        "19.3-41-gc4735dd3-0ubuntu1~18.04.1",
        "19.4-33-gbb4131a2-0ubuntu1~18.04.1"
      ]
    }
  ],
  "aliases": [],
  "details": "cloud-init through 19.4 relies on Mersenne Twister for a random password, which makes it easier for attackers to predict passwords, because rand_str in cloudinit/util.py calls the random.choice function.",
  "id": "UBUNTU-CVE-2020-8631",
  "modified": "2025-09-08T16:45:59Z",
  "published": "2020-02-05T14:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-8631"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/canonical/cloud-init/pull/204"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2020-8631"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "low",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2020-8631"
  ]
}



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