Vulnerability-Lookup

CVE-2023-46850 (GCVE-0-2023-46850)

Vulnerability from cvelistv5 – Published: 2023-11-11 00:15 – Updated: 2025-12-16 18:23

Summary

Use after free in OpenVPN version 2.6.0 to 2.6.6 may lead to undefined behavoir, leaking memory buffers or remote execution when sending network buffers to a remote peer.

Severity

No CVSS data available.

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-416 - Use After Free

Assigner

OpenVPN

References

5 references

URL	Tags
https://community.openvpn.net/openvpn/wiki/CVE-20…
https://openvpn.net/security-advisory/access-serv…
https://www.debian.org/security/2023/dsa-5555
https://lists.fedoraproject.org/archives/list/pac…
https://lists.fedoraproject.org/archives/list/pac…

Impacted products

2 products

Vendor	Product	Version
OpenVPN	OpenVPN 2 (Community)	Affected: 2.6.0 , ≤ 2.6.6 (minor release)
OpenVPN	Access Server	Affected: 2.11.0 , ≤ 2.11.3 (patch release) Affected: 2.12.0 , ≤ 2.12.2 (patch release)

Show details on NVD website

JSON

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WID-SEC-W-2023-2872

Vulnerability from csaf_certbund - Published: 2023-11-09 23:00 - Updated: 2024-09-22 22:00

Summary

OpenVPN: Mehrere Schwachstellen

Severity

Mittel

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: OpenVPN ist eine Open Source Software zum Aufbau eines Virtuellen Privaten Netzwerkes (VPN) über eine verschlüsselte TLS-Verbindung. Zur Verschlüsselung werden die Bibliotheken des Programmes OpenSSL benutzt.

Angriff: Ein entfernter authentifizierter Angreifer kann mehrere Schwachstellen in OpenVPN ausnutzen, um einen Denial-of-Service-Zustand zu erzeugen oder vertrauliche Informationen offenzulegen.

Betroffene Betriebssysteme: - Linux - MacOS X - Sonstiges - UNIX - Windows

CVE-2023-46849

Es besteht eine Schwachstelle in OpenVPN. Dieser Fehler besteht, weil das Produkt die "--fragment"-Konfiguration unter bestimmten Umständen nicht korrekt wiederherstellt, was zu einem Problem der Division durch Null führt. Ein entfernter, authentifizierter Angreifer kann diese Schwachstelle ausnutzen, um einen Denial-of-Service-Zustand zu verursachen.

Affected products

Known affected 5 products

Product	Identifier	Version
Open Source OpenVPN <2.6.7 Open Source / OpenVPN		<2.6.7
Debian Linux Debian	`cpe:/o:debian:debian_linux:-`	—
Ubuntu Linux Ubuntu	`cpe:/o:canonical:ubuntu_linux:-`	—
Gentoo Linux Gentoo	`cpe:/o:gentoo:linux:-`	—
Fedora Linux Fedora	`cpe:/o:fedoraproject:fedora:-`	—

CVE-2023-46850

Es besteht eine Schwachstelle in OpenVPN. Dieser Fehler besteht in den TLS-Verbindungen, da ein Sendepuffer falsch verwendet wird, was dazu führt, dass freier()Speicher an die Gegenstelle gesendet wird. Ein entfernter, authentifizierter Angreifer kann diese Schwachstelle ausnutzen, um vertrauliche Informationen offenzulegen.

Affected products

Known affected 5 products

Product	Identifier	Version
Open Source OpenVPN <2.6.7 Open Source / OpenVPN		<2.6.7
Debian Linux Debian	`cpe:/o:debian:debian_linux:-`	—
Ubuntu Linux Ubuntu	`cpe:/o:canonical:ubuntu_linux:-`	—
Gentoo Linux Gentoo	`cpe:/o:gentoo:linux:-`	—
Fedora Linux Fedora	`cpe:/o:fedoraproject:fedora:-`	—

References

8 references

URL	Category
https://wid.cert-bund.de/.well-known/csaf/white/2…	self
https://wid.cert-bund.de/portal/wid/securityadvis…	self
https://github.com/OpenVPN/openvpn/blob/v2.6.7/Ch…	external
https://lists.debian.org/debian-security-announce…	external
https://ubuntu.com/security/notices/USN-6484-1	external
https://bodhi.fedoraproject.org/updates/FEDORA-20…	external
https://bodhi.fedoraproject.org/updates/FEDORA-20…	external
https://security.gentoo.org/glsa/202409-08	external

JSON

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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": "OpenVPN ist eine Open Source Software zum Aufbau eines Virtuellen Privaten Netzwerkes (VPN) \u00fcber eine verschl\u00fcsselte TLS-Verbindung. Zur Verschl\u00fcsselung werden die Bibliotheken des Programmes OpenSSL benutzt.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein entfernter authentifizierter Angreifer kann mehrere Schwachstellen in OpenVPN ausnutzen, um einen Denial-of-Service-Zustand zu erzeugen oder vertrauliche Informationen offenzulegen.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Linux\n- MacOS X\n- Sonstiges\n- UNIX\n- Windows",
        "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-2023-2872 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2023/wid-sec-w-2023-2872.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2023-2872 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2023-2872"
      },
      {
        "category": "external",
        "summary": "GitHub OpenVPN vom 2023-11-09",
        "url": "https://github.com/OpenVPN/openvpn/blob/v2.6.7/Changes.rst"
      },
      {
        "category": "external",
        "summary": "Debian Security Advisory DSA-5555 vom 2023-11-15",
        "url": "https://lists.debian.org/debian-security-announce/2023/msg00251.html"
      },
      {
        "category": "external",
        "summary": "Ubuntu Security Notice USN-6484-1 vom 2023-11-16",
        "url": "https://ubuntu.com/security/notices/USN-6484-1"
      },
      {
        "category": "external",
        "summary": "Fedora Security Advisory FEDORA-2023-D9D55A0BFC vom 2023-11-20",
        "url": "https://bodhi.fedoraproject.org/updates/FEDORA-2023-d9d55a0bfc"
      },
      {
        "category": "external",
        "summary": "Fedora Security Advisory FEDORA-2023-E4DF33666C vom 2023-11-20",
        "url": "https://bodhi.fedoraproject.org/updates/FEDORA-2023-e4df33666c"
      },
      {
        "category": "external",
        "summary": "Gentoo Linux Security Advisory GLSA-202409-08 vom 2024-09-22",
        "url": "https://security.gentoo.org/glsa/202409-08"
      }
    ],
    "source_lang": "en-US",
    "title": "OpenVPN: Mehrere Schwachstellen",
    "tracking": {
      "current_release_date": "2024-09-22T22:00:00.000+00:00",
      "generator": {
        "date": "2024-09-23T08:05:17.327+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.3.8"
        }
      },
      "id": "WID-SEC-W-2023-2872",
      "initial_release_date": "2023-11-09T23:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2023-11-09T23:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        },
        {
          "date": "2023-11-15T23:00:00.000+00:00",
          "number": "2",
          "summary": "Neue Updates von Debian aufgenommen"
        },
        {
          "date": "2023-11-16T23:00:00.000+00:00",
          "number": "3",
          "summary": "Neue Updates von Ubuntu aufgenommen"
        },
        {
          "date": "2023-11-20T23:00:00.000+00:00",
          "number": "4",
          "summary": "Neue Updates von Fedora aufgenommen"
        },
        {
          "date": "2024-09-22T22:00:00.000+00:00",
          "number": "5",
          "summary": "Neue Updates von Gentoo aufgenommen"
        }
      ],
      "status": "final",
      "version": "5"
    }
  },
  "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": [
          {
            "category": "product_name",
            "name": "Fedora Linux",
            "product": {
              "name": "Fedora Linux",
              "product_id": "74185",
              "product_identification_helper": {
                "cpe": "cpe:/o:fedoraproject:fedora:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "Fedora"
      },
      {
        "branches": [
          {
            "category": "product_name",
            "name": "Gentoo Linux",
            "product": {
              "name": "Gentoo Linux",
              "product_id": "T012167",
              "product_identification_helper": {
                "cpe": "cpe:/o:gentoo:linux:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "Gentoo"
      },
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c2.6.7",
                "product": {
                  "name": "Open Source OpenVPN \u003c2.6.7",
                  "product_id": "T031038"
                }
              },
              {
                "category": "product_version",
                "name": "2.6.7",
                "product": {
                  "name": "Open Source OpenVPN 2.6.7",
                  "product_id": "T031038-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:openvpn:openvpn:2.6.7"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "OpenVPN"
          }
        ],
        "category": "vendor",
        "name": "Open Source"
      },
      {
        "branches": [
          {
            "category": "product_name",
            "name": "Ubuntu Linux",
            "product": {
              "name": "Ubuntu Linux",
              "product_id": "T000126",
              "product_identification_helper": {
                "cpe": "cpe:/o:canonical:ubuntu_linux:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "Ubuntu"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2023-46849",
      "notes": [
        {
          "category": "description",
          "text": "Es besteht eine Schwachstelle in OpenVPN. Dieser Fehler besteht, weil das Produkt die \"--fragment\"-Konfiguration unter bestimmten Umst\u00e4nden nicht korrekt wiederherstellt, was zu einem Problem der Division durch Null f\u00fchrt. Ein entfernter, authentifizierter Angreifer kann diese Schwachstelle ausnutzen, um einen Denial-of-Service-Zustand zu verursachen."
        }
      ],
      "product_status": {
        "known_affected": [
          "T031038",
          "2951",
          "T000126",
          "T012167",
          "74185"
        ]
      },
      "release_date": "2023-11-09T23:00:00.000+00:00",
      "title": "CVE-2023-46849"
    },
    {
      "cve": "CVE-2023-46850",
      "notes": [
        {
          "category": "description",
          "text": "Es besteht eine Schwachstelle in OpenVPN. Dieser Fehler besteht in den TLS-Verbindungen, da ein Sendepuffer falsch verwendet wird, was dazu f\u00fchrt, dass freier()Speicher an die Gegenstelle gesendet wird. Ein entfernter, authentifizierter Angreifer kann diese Schwachstelle ausnutzen, um vertrauliche Informationen offenzulegen."
        }
      ],
      "product_status": {
        "known_affected": [
          "T031038",
          "2951",
          "T000126",
          "T012167",
          "74185"
        ]
      },
      "release_date": "2023-11-09T23:00:00.000+00:00",
      "title": "CVE-2023-46850"
    }
  ]
}

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.

Action not permitted

CVE-2023-46850 (GCVE-0-2023-46850)

WID-SEC-W-2023-2872

Tags

Sightings

Nomenclature