csaf_certbund - wid-sec-w-2023-0978

WID-SEC-W-2023-0978

Vulnerability from csaf_certbund - Published: 2023-04-16 22:00 - Updated: 2025-04-21 22:00

Summary

shadow: Schwachstelle ermöglicht Darstellen falscher Informationen

Notes

Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.

Produktbeschreibung

Shadow stellt auf Unix/Linux Systemen einen Mechanismus bereit, um Passwörter von Benutzer als Hash zu speichern.

Angriff

Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in shadow ausnutzen, um falsche Informationen darzustellen.

Betroffene Betriebssysteme

- Linux - UNIX

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{
  "document": {
    "aggregate_severity": {
      "text": "mittel"
    },
    "category": "csaf_base",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "de-DE",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
      },
      {
        "category": "description",
        "text": "Shadow stellt auf Unix/Linux Systemen einen Mechanismus bereit, um Passw\u00f6rter von Benutzer als Hash zu speichern.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in shadow ausnutzen, um falsche Informationen darzustellen.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Linux\n- UNIX",
        "title": "Betroffene Betriebssysteme"
      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "csaf-provider@cert-bund.de",
      "name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
      "namespace": "https://www.bsi.bund.de"
    },
    "references": [
      {
        "category": "self",
        "summary": "WID-SEC-W-2023-0978 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2023/wid-sec-w-2023-0978.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2023-0978 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2023-0978"
      },
      {
        "category": "external",
        "summary": "GitHub Advisory Database vom 2023-04-16",
        "url": "https://github.com/advisories/GHSA-p9w4-8hh8-crcx"
      },
      {
        "category": "external",
        "summary": "SUSE Security Update SUSE-SU-2023:2066-1 vom 2023-04-29",
        "url": "https://lists.suse.com/pipermail/sle-security-updates/2023-April/014676.html"
      },
      {
        "category": "external",
        "summary": "SUSE Security Update SUSE-SU-2023:2069-1 vom 2023-04-28",
        "url": "https://lists.suse.com/pipermail/sle-security-updates/2023-April/014667.html"
      },
      {
        "category": "external",
        "summary": "SUSE Security Update SUSE-SU-2023:2068-1 vom 2023-04-28",
        "url": "https://lists.suse.com/pipermail/sle-security-updates/2023-April/014668.html"
      },
      {
        "category": "external",
        "summary": "SUSE Security Update SUSE-SU-2023:2067-1 vom 2023-04-28",
        "url": "https://lists.suse.com/pipermail/sle-security-updates/2023-April/014669.html"
      },
      {
        "category": "external",
        "summary": "SUSE Security Update SUSE-SU-2023:2066-1 vom 2023-04-28",
        "url": "https://lists.suse.com/pipermail/sle-security-updates/2023-April/014670.html"
      },
      {
        "category": "external",
        "summary": "SUSE Security Update SUSE-SU-2023:2070-1 vom 2023-04-28",
        "url": "https://lists.suse.com/pipermail/sle-security-updates/2023-April/014666.html"
      },
      {
        "category": "external",
        "summary": "Dell Security Advisory DSA-2023-317 vom 2023-11-13",
        "url": "https://www.dell.com/support/kbdoc/de-de/000219148/dsa-2023-317-security-update-for-dell-networker-vproxy-multiple-linux-packages-vulnerabilities"
      },
      {
        "category": "external",
        "summary": "SUSE Security Update SUSE-SU-2024:0939-1 vom 2024-03-22",
        "url": "https://lists.suse.com/pipermail/sle-security-updates/2024-March/018199.html"
      },
      {
        "category": "external",
        "summary": "SUSE Security Update SUSE-SU-2024:1007-1 vom 2024-03-27",
        "url": "https://lists.suse.com/pipermail/sle-security-updates/2024-March/018223.html"
      },
      {
        "category": "external",
        "summary": "Debian Security Advisory DLA-4130 vom 2025-04-18",
        "url": "https://lists.debian.org/debian-lts-announce/2025/04/msg00026.html"
      }
    ],
    "source_lang": "en-US",
    "title": "shadow: Schwachstelle erm\u00f6glicht Darstellen falscher Informationen",
    "tracking": {
      "current_release_date": "2025-04-21T22:00:00.000+00:00",
      "generator": {
        "date": "2025-04-22T08:42:09.549+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.3.12"
        }
      },
      "id": "WID-SEC-W-2023-0978",
      "initial_release_date": "2023-04-16T22:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2023-04-16T22:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        },
        {
          "date": "2023-05-01T22:00:00.000+00:00",
          "number": "2",
          "summary": "Neue Updates von SUSE aufgenommen"
        },
        {
          "date": "2023-11-12T23:00:00.000+00:00",
          "number": "3",
          "summary": "Neue Updates von Dell aufgenommen"
        },
        {
          "date": "2024-03-24T23:00:00.000+00:00",
          "number": "4",
          "summary": "Neue Updates von SUSE aufgenommen"
        },
        {
          "date": "2024-03-27T23:00:00.000+00:00",
          "number": "5",
          "summary": "Neue Updates von SUSE aufgenommen"
        },
        {
          "date": "2025-04-21T22:00:00.000+00:00",
          "number": "6",
          "summary": "Neue Updates von Debian aufgenommen"
        }
      ],
      "status": "final",
      "version": "6"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "category": "product_name",
            "name": "Debian Linux",
            "product": {
              "name": "Debian Linux",
              "product_id": "2951",
              "product_identification_helper": {
                "cpe": "cpe:/o:debian:debian_linux:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "Debian"
      },
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003cvproxy 19.9.0.2",
                "product": {
                  "name": "Dell NetWorker \u003cvproxy 19.9.0.2",
                  "product_id": "T030173"
                }
              },
              {
                "category": "product_version",
                "name": "vproxy 19.9.0.2",
                "product": {
                  "name": "Dell NetWorker vproxy 19.9.0.2",
                  "product_id": "T030173-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:dell:networker:vproxy_19.9.0.2"
                  }
                }
              },
              {
                "category": "product_version_range",
                "name": "\u003cvproxy 19.8.0.3",
                "product": {
                  "name": "Dell NetWorker \u003cvproxy 19.8.0.3",
                  "product_id": "T030174"
                }
              },
              {
                "category": "product_version",
                "name": "vproxy 19.8.0.3",
                "product": {
                  "name": "Dell NetWorker vproxy 19.8.0.3",
                  "product_id": "T030174-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:dell:networker:vproxy_19.8.0.3"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "NetWorker"
          }
        ],
        "category": "vendor",
        "name": "Dell"
      },
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "4.13",
                "product": {
                  "name": "Open Source shadow 4.13",
                  "product_id": "T027278",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:open_source:shadow:4.13"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "shadow"
          }
        ],
        "category": "vendor",
        "name": "Open Source"
      },
      {
        "branches": [
          {
            "category": "product_name",
            "name": "SUSE Linux",
            "product": {
              "name": "SUSE Linux",
              "product_id": "T002207",
              "product_identification_helper": {
                "cpe": "cpe:/o:suse:suse_linux:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "SUSE"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2023-29383",
      "product_status": {
        "known_affected": [
          "2951",
          "T002207",
          "T027278",
          "T030174",
          "T030173"
        ]
      },
      "release_date": "2023-04-16T22:00:00.000+00:00",
      "title": "CVE-2023-29383"
    }
  ]
}

CVE-2023-29383 (GCVE-0-2023-29383)

Vulnerability from cvelistv5 – Published: 2023-04-14 00:00 – Updated: 2025-11-03 19:28

Summary

In Shadow 4.13, it is possible to inject control characters into fields provided to the SUID program chfn (change finger). Although it is not possible to exploit this directly (e.g., adding a new user fails because \n is in the block list), it is possible to misrepresent the /etc/passwd file when viewed. Use of \r manipulations and Unicode characters to work around blocking of the : character make it possible to give the impression that a new user has been added. In other words, an adversary may be able to convince a system administrator to take the system offline (an indirect, social-engineered denial of service) by demonstrating that "cat /etc/passwd" shows a rogue user account.

Severity ?

No CVSS data available.

CWE

Assigner

mitre

References

URL

Tags

	https://github.com/shadow-maint/shadow/pull/687
	https://github.com/shadow-maint/shadow/commit/e59…
	https://www.trustwave.com/en-us/resources/securit…
	https://www.trustwave.com/en-us/resources/blogs/s…

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-03T19:28:12.823Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://github.com/shadow-maint/shadow/pull/687"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://github.com/shadow-maint/shadow/commit/e5905c4b84d4fb90aefcd96ee618411ebfac663d"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://www.trustwave.com/en-us/resources/security-resources/security-advisories/?fid=31797"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/cve-2023-29383-abusing-linux-chfn-to-misrepresent-etc-passwd/"
          },
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/04/msg00026.html"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2023-29383",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-02-06T21:21:27.050601Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-125",
                "description": "CWE-125 Out-of-bounds Read",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-02-06T21:23:31.283Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In Shadow 4.13, it is possible to inject control characters into fields provided to the SUID program chfn (change finger). Although it is not possible to exploit this directly (e.g., adding a new user fails because \\n is in the block list), it is possible to misrepresent the /etc/passwd file when viewed. Use of \\r manipulations and Unicode characters to work around blocking of the : character make it possible to give the impression that a new user has been added. In other words, an adversary may be able to convince a system administrator to take the system offline (an indirect, social-engineered denial of service) by demonstrating that \"cat /etc/passwd\" shows a rogue user account."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2023-04-14T00:00:00.000Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "url": "https://github.com/shadow-maint/shadow/pull/687"
        },
        {
          "url": "https://github.com/shadow-maint/shadow/commit/e5905c4b84d4fb90aefcd96ee618411ebfac663d"
        },
        {
          "url": "https://www.trustwave.com/en-us/resources/security-resources/security-advisories/?fid=31797"
        },
        {
          "url": "https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/cve-2023-29383-abusing-linux-chfn-to-misrepresent-etc-passwd/"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2023-29383",
    "datePublished": "2023-04-14T00:00:00.000Z",
    "dateReserved": "2023-04-05T00:00:00.000Z",
    "dateUpdated": "2025-11-03T19:28:12.823Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

WID-SEC-W-2023-0978

CVE-2023-29383 (GCVE-0-2023-29383)

Tags

Sightings

Nomenclature