csaf_certbund - wid-sec-w-2024-0494

wid-sec-w-2024-0494

Vulnerability from csaf_certbund

Published

2024-02-27 23:00

Modified

2024-09-22 22:00

Summary

Xen: Schwachstelle ermöglicht Denial of Service

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

Xen ist ein Virtueller-Maschinen-Monitor (VMM), der Hardware (x86, IA-64, PowerPC) für die darauf laufenden Systeme (Domains) paravirtualisiert.

Angriff

Ein lokaler Angreifer kann eine Schwachstelle in Xen ausnutzen, um einen Denial of Service Angriff durchzuführen.

Betroffene Betriebssysteme

- Linux

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": "Xen ist ein Virtueller-Maschinen-Monitor (VMM), der Hardware (x86, IA-64, PowerPC) f\u00fcr die darauf laufenden Systeme (Domains) paravirtualisiert.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein lokaler Angreifer kann eine Schwachstelle in Xen ausnutzen, um einen Denial of Service Angriff durchzuf\u00fchren.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Linux",
        "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-2024-0494 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2024/wid-sec-w-2024-0494.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2024-0494 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2024-0494"
      },
      {
        "category": "external",
        "summary": "SUSE Security Update SUSE-SU-2024:0830-1 vom 2024-03-11",
        "url": "https://lists.suse.com/pipermail/sle-security-updates/2024-March/018142.html"
      },
      {
        "category": "external",
        "summary": "Xen Security Advisories vom 2024-02-27",
        "url": "https://xenbits.xen.org/xsa/advisory-451.html"
      },
      {
        "category": "external",
        "summary": "Fedora Security Advisory vom 2024-02-27",
        "url": "https://bodhi.fedoraproject.org/updates/FEDORA-2024-0da80aa623"
      },
      {
        "category": "external",
        "summary": "Fedora Security Advisory vom 2024-02-27",
        "url": "https://bodhi.fedoraproject.org/updates/FEDORA-2024-aca9ed1eb1"
      },
      {
        "category": "external",
        "summary": "Fedora Security Advisory vom 2024-02-27",
        "url": "https://bodhi.fedoraproject.org/updates/FEDORA-2024-ee7c81a4d6"
      },
      {
        "category": "external",
        "summary": "Fedora Security Advisory FEDORA-2024-3A36322C4B vom 2024-03-21",
        "url": "https://bodhi.fedoraproject.org/updates/FEDORA-2024-3a36322c4b"
      },
      {
        "category": "external",
        "summary": "SUSE Security Update SUSE-SU-2024:0934-1 vom 2024-03-22",
        "url": "https://lists.suse.com/pipermail/sle-security-updates/2024-March/018203.html"
      },
      {
        "category": "external",
        "summary": "SUSE Security Update SUSE-SU-2024:0935-1 vom 2024-03-22",
        "url": "https://lists.suse.com/pipermail/sle-security-updates/2024-March/018202.html"
      },
      {
        "category": "external",
        "summary": "SUSE Security Update SUSE-SU-2024:1102-1 vom 2024-04-08",
        "url": "https://lists.suse.com/pipermail/sle-security-updates/2024-April/018294.html"
      },
      {
        "category": "external",
        "summary": "Gentoo Linux Security Advisory GLSA-202409-10 vom 2024-09-22",
        "url": "https://security.gentoo.org/glsa/202409-10"
      }
    ],
    "source_lang": "en-US",
    "title": "Xen: Schwachstelle erm\u00f6glicht Denial of Service",
    "tracking": {
      "current_release_date": "2024-09-22T22:00:00.000+00:00",
      "generator": {
        "date": "2024-09-23T08:05:13.066+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.3.8"
        }
      },
      "id": "WID-SEC-W-2024-0494",
      "initial_release_date": "2024-02-27T23:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2024-02-27T23:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        },
        {
          "date": "2024-03-11T23:00:00.000+00:00",
          "number": "2",
          "summary": "Neue Updates von SUSE aufgenommen"
        },
        {
          "date": "2024-03-21T23:00:00.000+00:00",
          "number": "3",
          "summary": "Neue Updates von Fedora aufgenommen"
        },
        {
          "date": "2024-03-24T23:00:00.000+00:00",
          "number": "4",
          "summary": "Neue Updates von SUSE aufgenommen"
        },
        {
          "date": "2024-04-08T22:00:00.000+00:00",
          "number": "5",
          "summary": "Neue Updates von SUSE aufgenommen"
        },
        {
          "date": "2024-09-22T22:00:00.000+00:00",
          "number": "6",
          "summary": "Neue Updates von Gentoo aufgenommen"
        }
      ],
      "status": "final",
      "version": "6"
    }
  },
  "product_tree": {
    "branches": [
      {
        "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": "\u003c4.15",
                "product": {
                  "name": "Open Source Xen \u003c4.15",
                  "product_id": "T033130"
                }
              },
              {
                "category": "product_version",
                "name": "4.15",
                "product": {
                  "name": "Open Source Xen 4.15",
                  "product_id": "T033130-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/o:xen:xen:4.15"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "Xen"
          }
        ],
        "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-2023-46841",
      "notes": [
        {
          "category": "description",
          "text": "Es besteht eine Schwachstelle in Xen. Dieser Fehler besteht in der Hypervisor-Komponente. Ein lokaler Angreifer kann diese Schwachstelle ausnutzen, um einen Denial-of-Service-Zustand zu verursachen."
        }
      ],
      "product_status": {
        "known_affected": [
          "T002207",
          "T033130",
          "T012167",
          "74185"
        ]
      },
      "release_date": "2024-02-27T23:00:00.000+00:00",
      "title": "CVE-2023-46841"
    }
  ]
}

cve-2023-46841

Vulnerability from cvelistv5

Published

2024-03-20 10:40

Modified

2024-11-05 18:53

Severity ?

6.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Summary

Recent x86 CPUs offer functionality named Control-flow Enforcement Technology (CET). A sub-feature of this are Shadow Stacks (CET-SS). CET-SS is a hardware feature designed to protect against Return Oriented Programming attacks. When enabled, traditional stacks holding both data and return addresses are accompanied by so called "shadow stacks", holding little more than return addresses. Shadow stacks aren't writable by normal instructions, and upon function returns their contents are used to check for possible manipulation of a return address coming from the traditional stack. In particular certain memory accesses need intercepting by Xen. In various cases the necessary emulation involves kind of replaying of the instruction. Such replaying typically involves filling and then invoking of a stub. Such a replayed instruction may raise an exceptions, which is expected and dealt with accordingly. Unfortunately the interaction of both of the above wasn't right: Recovery involves removal of a call frame from the (traditional) stack. The counterpart of this operation for the shadow stack was missing.

References

▼	URL	Tags
	https://xenbits.xenproject.org/xsa/advisory-451.html
	https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZON4TLXG7TG4A2XZG563JMVTGQW4SF3A/

Impacted products

Vendor

Product

Version

▼

Xen

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 6.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "CHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2023-46841",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-03-25T16:09:38.636466Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "description": "CWE-noinfo Not enough information",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-11-05T18:53:05.398Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-02T20:53:21.716Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://xenbits.xenproject.org/xsa/advisory-451.html"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZON4TLXG7TG4A2XZG563JMVTGQW4SF3A/"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "product": "Xen",
          "vendor": "Xen",
          "versions": [
            {
              "status": "unknown",
              "version": "consult Xen advisory XSA-451"
            }
          ]
        }
      ],
      "configurations": [
        {
          "lang": "en",
          "value": "Xen 4.14 and onwards are vulnerable.  Xen 4.13 and older are not\nvulnerable.\n\nOnly x86 systems with CET-SS enabled are vulnerable.  x86 systems with\nCET-SS unavailable or disabled are not vulnerable.  Arm systems are not\nvulnerable.  See\nhttps://xenbits.xen.org/docs/latest/faq.html#tell-if-cet-is-active\nfor how to determine whether CET-SS is active.\n\nOnly HVM or PVH guests can leverage the vulnerability.  PV guests cannot\nleverage the vulnerability.\n"
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "This issue was discovered by Jan Beulich of SUSE.\n"
        }
      ],
      "datePublic": "2024-02-27T10:38:00Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "Recent x86 CPUs offer functionality named Control-flow Enforcement\nTechnology (CET).  A sub-feature of this are Shadow Stacks (CET-SS).\nCET-SS is a hardware feature designed to protect against Return Oriented\nProgramming attacks. When enabled, traditional stacks holding both data\nand return addresses are accompanied by so called \"shadow stacks\",\nholding little more than return addresses.  Shadow stacks aren\u0027t\nwritable by normal instructions, and upon function returns their\ncontents are used to check for possible manipulation of a return address\ncoming from the traditional stack.\n\nIn particular certain memory accesses need intercepting by Xen.  In\nvarious cases the necessary emulation involves kind of replaying of\nthe instruction.  Such replaying typically involves filling and then\ninvoking of a stub.  Such a replayed instruction may raise an\nexceptions, which is expected and dealt with accordingly.\n\nUnfortunately the interaction of both of the above wasn\u0027t right:\nRecovery involves removal of a call frame from the (traditional) stack.\nThe counterpart of this operation for the shadow stack was missing.\n"
        }
      ],
      "impacts": [
        {
          "descriptions": [
            {
              "lang": "en",
              "value": "An unprivileged guest can cause a hypervisor crash, causing a Denial of\nService (DoS) of the entire host.\n"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-03-20T10:40:36.597Z",
        "orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
        "shortName": "XEN"
      },
      "references": [
        {
          "url": "https://xenbits.xenproject.org/xsa/advisory-451.html"
        },
        {
          "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZON4TLXG7TG4A2XZG563JMVTGQW4SF3A/"
        }
      ],
      "title": "x86: shadow stack vs exceptions from emulation stubs",
      "workarounds": [
        {
          "lang": "en",
          "value": "While in principle it is possible to disable use of CET on capable\nsystems using the \"cet=no-shstk\" command line option, doing so disables\nan important security feature and may therefore not be advisable.\n"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
    "assignerShortName": "XEN",
    "cveId": "CVE-2023-46841",
    "datePublished": "2024-03-20T10:40:36.597Z",
    "dateReserved": "2023-10-27T07:55:35.333Z",
    "dateUpdated": "2024-11-05T18:53:05.398Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

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