csaf_certbund - wid-sec-w-2025-1447

WID-SEC-W-2025-1447

Vulnerability from csaf_certbund - Published: 2025-07-01 22:00 - Updated: 2025-12-02 23:00

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

Betroffene Betriebssysteme

- Sonstiges - UNIX

JSON

To clipboard

{
  "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 entfernter, authentisierter Angreifer kann eine Schwachstelle in Xen ausnutzen, um einen Denial of Service Angriff durchzuf\u00fchren.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Sonstiges\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-2025-1447 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2025/wid-sec-w-2025-1447.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2025-1447 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2025-1447"
      },
      {
        "category": "external",
        "summary": "Xen Security Advisory XSA-470 vom 2025-07-01",
        "url": "https://xenbits.xen.org/xsa/advisory-470.html"
      },
      {
        "category": "external",
        "summary": "Citrix Security Advisory CTX694780 vom 2025-06-24",
        "url": "https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694780\u0026articleURL=XenServer_Security_Update_for_CVE_2025_27465"
      },
      {
        "category": "external",
        "summary": "openSUSE Security Update OPENSUSE-SU-2025:15342-1 vom 2025-07-12",
        "url": "https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/PTKZKBD5LRIUBCNJO4ON4DFH6PMVYLO5/"
      },
      {
        "category": "external",
        "summary": "SUSE Security Update SUSE-SU-2025:02316-1 vom 2025-07-15",
        "url": "https://lists.suse.com/pipermail/sle-security-updates/2025-July/021816.html"
      },
      {
        "category": "external",
        "summary": "SUSE Security Update SUSE-SU-2025:02319-1 vom 2025-07-15",
        "url": "https://lists.suse.com/pipermail/sle-security-updates/2025-July/021813.html"
      },
      {
        "category": "external",
        "summary": "SUSE Security Update SUSE-SU-2025:02315-1 vom 2025-07-15",
        "url": "https://lists.suse.com/pipermail/sle-security-updates/2025-July/021817.html"
      },
      {
        "category": "external",
        "summary": "SUSE Security Update SUSE-SU-2025:02325-1 vom 2025-07-16",
        "url": "https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/V34T2ADBPUIYXBK7CDQ6YGNZJR5Q4URJ/"
      },
      {
        "category": "external",
        "summary": "SUSE Security Update SUSE-SU-2025:02326-1 vom 2025-07-16",
        "url": "https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/7K2UTRMLRMJHPTYHR2DUBWFSLIRYH3TW/"
      },
      {
        "category": "external",
        "summary": "SUSE Security Update SUSE-SU-2025:02471-1 vom 2025-07-23",
        "url": "https://lists.suse.com/pipermail/sle-security-updates/2025-July/021931.html"
      },
      {
        "category": "external",
        "summary": "Fedora Security Advisory FEDORA-2025-D2A821D9D1 vom 2025-08-06",
        "url": "https://bodhi.fedoraproject.org/updates/FEDORA-2025-d2a821d9d1"
      },
      {
        "category": "external",
        "summary": "Fedora Security Advisory FEDORA-2025-DDAA63A0F5 vom 2025-08-05",
        "url": "https://bodhi.fedoraproject.org/updates/FEDORA-2025-ddaa63a0f5"
      },
      {
        "category": "external",
        "summary": "Debian Security Advisory DSA-6068 vom 2025-12-03",
        "url": "https://lists.debian.org/debian-security-announce/2025/msg00234.html"
      }
    ],
    "source_lang": "en-US",
    "title": "Xen: Schwachstelle erm\u00f6glicht Denial of Service",
    "tracking": {
      "current_release_date": "2025-12-02T23:00:00.000+00:00",
      "generator": {
        "date": "2025-12-03T08:02:56.190+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.5.0"
        }
      },
      "id": "WID-SEC-W-2025-1447",
      "initial_release_date": "2025-07-01T22:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2025-07-01T22:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        },
        {
          "date": "2025-07-02T22:00:00.000+00:00",
          "number": "2",
          "summary": "Neue Updates von Citrix aufgenommen"
        },
        {
          "date": "2025-07-13T22:00:00.000+00:00",
          "number": "3",
          "summary": "Neue Updates von openSUSE aufgenommen"
        },
        {
          "date": "2025-07-15T22:00:00.000+00:00",
          "number": "4",
          "summary": "Neue Updates von SUSE aufgenommen"
        },
        {
          "date": "2025-07-16T22:00:00.000+00:00",
          "number": "5",
          "summary": "Referenz(en) aufgenommen: EUVD-2025-21593"
        },
        {
          "date": "2025-07-22T22:00:00.000+00:00",
          "number": "6",
          "summary": "Neue Updates von SUSE aufgenommen"
        },
        {
          "date": "2025-08-05T22:00:00.000+00:00",
          "number": "7",
          "summary": "Neue Updates von Fedora aufgenommen"
        },
        {
          "date": "2025-12-02T23:00:00.000+00:00",
          "number": "8",
          "summary": "Neue Updates von Debian aufgenommen"
        }
      ],
      "status": "final",
      "version": "8"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "8.4",
                "product": {
                  "name": "Citrix Systems XenServer 8.4",
                  "product_id": "T043563",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:citrix:xenserver:8.4"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "XenServer"
          }
        ],
        "category": "vendor",
        "name": "Citrix Systems"
      },
      {
        "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": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "x86 \u003e=4.9",
                "product": {
                  "name": "Open Source Xen x86 \u003e=4.9",
                  "product_id": "T045002"
                }
              },
              {
                "category": "product_version_range",
                "name": "x86 \u003e=4.9",
                "product": {
                  "name": "Open Source Xen x86 \u003e=4.9",
                  "product_id": "T045002-fixed"
                }
              },
              {
                "category": "product_version_range",
                "name": "x86 \u003c4.17",
                "product": {
                  "name": "Open Source Xen x86 \u003c4.17",
                  "product_id": "T045003"
                }
              },
              {
                "category": "product_version",
                "name": "x86 4.17",
                "product": {
                  "name": "Open Source Xen x86 4.17",
                  "product_id": "T045003-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/o:xen:xen:x86__4.17"
                  }
                }
              }
            ],
            "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": "product_name",
            "name": "SUSE openSUSE",
            "product": {
              "name": "SUSE openSUSE",
              "product_id": "T027843",
              "product_identification_helper": {
                "cpe": "cpe:/o:suse:opensuse:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "SUSE"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2025-27465",
      "product_status": {
        "known_affected": [
          "2951",
          "T002207",
          "T027843",
          "74185",
          "T043563",
          "T045003"
        ]
      },
      "release_date": "2025-07-01T22:00:00.000+00:00",
      "title": "CVE-2025-27465"
    }
  ]
}

CVE-2025-27465 (GCVE-0-2025-27465)

Vulnerability from cvelistv5 – Published: 2025-07-16 09:08 – Updated: 2025-11-04 21:09

Summary

Certain instructions need intercepting and emulating by Xen. In some cases Xen emulates the instruction by replaying it, using an executable stub. Some instructions may raise an exception, which is supposed to be handled gracefully. Certain replayed instructions have additional logic to set up and recover the changes to the arithmetic flags. For replayed instructions where the flags recovery logic is used, the metadata for exception handling was incorrect, preventing Xen from handling the the exception gracefully, treating it as fatal instead.

Severity ?

4.3 (Medium)


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

CWE

CWE-755 - Improper Handling of Exceptional Conditions

Assigner

XEN

References

URL

Tags

https://xenbits.xenproject.org/xsa/advisory-470.html

Impacted products

	Vendor	Product	Version
	Xen	Xen	Unknown: consult Xen advisory XSA-470

Credits

This issue was discovered by Andrew Cooper of XenServer.

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "LOW",
              "baseScore": 4.3,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2025-27465",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-07-16T20:46:06.289437Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-755",
                "description": "CWE-755 Improper Handling of Exceptional Conditions",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-07-17T15:00:57.741Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-04T21:09:50.127Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://xenbits.xen.org/xsa/advisory-470.html"
          },
          {
            "url": "http://www.openwall.com/lists/oss-security/2025/07/01/1"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "product": "Xen",
          "vendor": "Xen",
          "versions": [
            {
              "status": "unknown",
              "version": "consult Xen advisory XSA-470"
            }
          ]
        }
      ],
      "configurations": [
        {
          "lang": "en",
          "value": "Xen 4.9 and onwards are vulnerable.  Xen 4.8 and older are not\nvulnerable.\n\nOnly x86 systems are vulnerable.  ARM systems are not vulnerable.\n\nOnly HVM or PVH guests can leverage the vulnerability.  PV guests cannot\nleverage the vulnerability."
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "This issue was discovered by Andrew Cooper of XenServer."
        }
      ],
      "datePublic": "2025-07-01T11:56:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "Certain instructions need intercepting and emulating by Xen.  In some\ncases Xen emulates the instruction by replaying it, using an executable\nstub.  Some instructions may raise an exception, which is supposed to be\nhandled gracefully.  Certain replayed instructions have additional logic\nto set up and recover the changes to the arithmetic flags.\n\nFor replayed instructions where the flags recovery logic is used, the\nmetadata for exception handling was incorrect, preventing Xen from\nhandling the the exception gracefully, treating it as fatal instead."
        }
      ],
      "impacts": [
        {
          "descriptions": [
            {
              "lang": "en",
              "value": "An unprivileged guest can cause a hypervisor crash, causing a Denial of\nService (DoS) of the entire host."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-07-16T09:08:39.931Z",
        "orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
        "shortName": "XEN"
      },
      "references": [
        {
          "url": "https://xenbits.xenproject.org/xsa/advisory-470.html"
        }
      ],
      "title": "x86: Incorrect stubs exception handling for flags recovery",
      "workarounds": [
        {
          "lang": "en",
          "value": "There are no mitigations."
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
    "assignerShortName": "XEN",
    "cveId": "CVE-2025-27465",
    "datePublished": "2025-07-16T09:08:39.931Z",
    "dateReserved": "2025-02-26T09:16:54.461Z",
    "dateUpdated": "2025-11-04T21:09:50.127Z",
    "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-2025-1447

CVE-2025-27465 (GCVE-0-2025-27465)

Tags

Sightings

Nomenclature