Vulnerability-Lookup

ubuntu-cve-2017-20002 Withdrawn 2025-07-18

Vulnerability from osv_ubuntu

Published

2021-03-17 06:15

Modified

2025-07-16 04:53

Summary

Details

The Debian shadow package before 1:4.5-1 for Shadow incorrectly lists pts/0 and pts/1 as physical terminals in /etc/securetty. This allows local users to login as password-less users even if they are connected by non-physical means such as SSH (hence bypassing PAM's nullok_secure configuration). This notably affects environments such as virtual machines automatically generated with a default blank root password, allowing all local users to escalate privileges.

Severity

7.8 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2017-20002	REPORT
	https://bugs.debian.org/cgi-bin/bugreport.cgi?bug…	REPORT
	https://bugs.debian.org/cgi-bin/bugreport.cgi?bug…	REPORT
	https://lists.debian.org/debian-lts-announce/2021…	REPORT
	https://www.cve.org/CVERecord?id=CVE-2017-20002	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "login",
            "binary_version": "1:4.2-3.1ubuntu5.4"
          },
          {
            "binary_name": "login-dbgsym",
            "binary_version": "1:4.2-3.1ubuntu5.4"
          },
          {
            "binary_name": "passwd",
            "binary_version": "1:4.2-3.1ubuntu5.4"
          },
          {
            "binary_name": "passwd-dbgsym",
            "binary_version": "1:4.2-3.1ubuntu5.4"
          },
          {
            "binary_name": "uidmap",
            "binary_version": "1:4.2-3.1ubuntu5.4"
          },
          {
            "binary_name": "uidmap-dbgsym",
            "binary_version": "1:4.2-3.1ubuntu5.4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "shadow",
        "purl": "pkg:deb/ubuntu/shadow@1:4.2-3.1ubuntu5.4?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:4.2-3.1ubuntu5.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:4.1.5.1-1.1ubuntu7",
        "1:4.2-3.1ubuntu1",
        "1:4.2-3.1ubuntu2",
        "1:4.2-3.1ubuntu3",
        "1:4.2-3.1ubuntu4",
        "1:4.2-3.1ubuntu5",
        "1:4.2-3.1ubuntu5.2",
        "1:4.2-3.1ubuntu5.3"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "login",
            "binary_version": "1:4.5-1ubuntu2"
          },
          {
            "binary_name": "login-dbgsym",
            "binary_version": "1:4.5-1ubuntu2"
          },
          {
            "binary_name": "passwd",
            "binary_version": "1:4.5-1ubuntu2"
          },
          {
            "binary_name": "passwd-dbgsym",
            "binary_version": "1:4.5-1ubuntu2"
          },
          {
            "binary_name": "uidmap",
            "binary_version": "1:4.5-1ubuntu2"
          },
          {
            "binary_name": "uidmap-dbgsym",
            "binary_version": "1:4.5-1ubuntu2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "shadow",
        "purl": "pkg:deb/ubuntu/shadow@1:4.5-1ubuntu2?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:4.5-1ubuntu2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:4.2-3.2ubuntu4",
        "1:4.5-1ubuntu1"
      ]
    }
  ],
  "aliases": [],
  "details": "The Debian shadow package before 1:4.5-1 for Shadow incorrectly lists pts/0 and pts/1 as physical terminals in /etc/securetty. This allows local users to login as password-less users even if they are connected by non-physical means such as SSH (hence bypassing PAM\u0027s nullok_secure configuration). This notably affects environments such as virtual machines automatically generated with a default blank root password, allowing all local users to escalate privileges.",
  "id": "UBUNTU-CVE-2017-20002",
  "modified": "2025-07-16T04:53:19Z",
  "published": "2021-03-17T06:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2017-20002"
    },
    {
      "type": "REPORT",
      "url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=877374"
    },
    {
      "type": "REPORT",
      "url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=914957"
    },
    {
      "type": "REPORT",
      "url": "https://lists.debian.org/debian-lts-announce/2021/03/msg00020.html"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2017-20002"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2017-20002"
  ],
  "withdrawn": "2025-07-18T16:44:19Z"
}

CVE-2017-20002 (GCVE-0-2017-20002)

Vulnerability from cvelistv5 – Published: 2021-03-17 06:00 – Updated: 2024-08-05 21:45

Summary

Severity

No CVSS data available.

CWE

Assigner

mitre mitre root

References

3 references

URL	Tags
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug…	x_refsource_MISC
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug…	x_refsource_MISC
https://lists.debian.org/debian-lts-announce/2021…	mailing-listx_refsource_MLIST

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-05T21:45:24.409Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=877374"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=914957"
          },
          {
            "name": "[debian-lts-announce] 20210317 [SECURITY] [DLA 2596-1] shadow security update",
            "tags": [
              "mailing-list",
              "x_refsource_MLIST",
              "x_transferred"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2021/03/msg00020.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The Debian shadow package before 1:4.5-1 for Shadow incorrectly lists pts/0 and pts/1 as physical terminals in /etc/securetty. This allows local users to login as password-less users even if they are connected by non-physical means such as SSH (hence bypassing PAM\u0027s nullok_secure configuration). This notably affects environments such as virtual machines automatically generated with a default blank root password, allowing all local users to escalate privileges."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2021-03-18T03:57:29.000Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=877374"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=914957"
        },
        {
          "name": "[debian-lts-announce] 20210317 [SECURITY] [DLA 2596-1] shadow security update",
          "tags": [
            "mailing-list",
            "x_refsource_MLIST"
          ],
          "url": "https://lists.debian.org/debian-lts-announce/2021/03/msg00020.html"
        }
      ],
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "cve@mitre.org",
          "ID": "CVE-2017-20002",
          "STATE": "PUBLIC"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "n/a",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "n/a"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "n/a"
              }
            ]
          }
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
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            }
          ]
        },
        "problemtype": {
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        "references": {
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            {
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              "refsource": "MISC",
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            },
            {
              "name": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=914957",
              "refsource": "MISC",
              "url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=914957"
            },
            {
              "name": "[debian-lts-announce] 20210317 [SECURITY] [DLA 2596-1] shadow security update",
              "refsource": "MLIST",
              "url": "https://lists.debian.org/debian-lts-announce/2021/03/msg00020.html"
            }
          ]
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2017-20002",
    "datePublished": "2021-03-17T06:00:09.000Z",
    "dateReserved": "2021-03-17T00:00:00.000Z",
    "dateUpdated": "2024-08-05T21:45:24.409Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.