GSD-2022-42327

Vulnerability from gsd - Updated: 2023-12-13 01:19
Details
x86: unintended memory sharing between guests On Intel systems that support the "virtualize APIC accesses" feature, a guest can read and write the global shared xAPIC page by moving the local APIC out of xAPIC mode. Access to this shared page bypasses the expected isolation that should exist between two guests.
Aliases
Aliases
CVE-2022-42327
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{
  "GSD": {
    "alias": "CVE-2022-42327",
    "description": "x86: unintended memory sharing between guests On Intel systems that support the \"virtualize APIC accesses\" feature, a guest can read and write the global shared xAPIC page by moving the local APIC out of xAPIC mode. Access to this shared page bypasses the expected isolation that should exist between two guests.",
    "id": "GSD-2022-42327",
    "references": [
      "https://www.suse.com/security/cve/CVE-2022-42327.html"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2022-42327"
      ],
      "details": "x86: unintended memory sharing between guests On Intel systems that support the \"virtualize APIC accesses\" feature, a guest can read and write the global shared xAPIC page by moving the local APIC out of xAPIC mode. Access to this shared page bypasses the expected isolation that should exist between two guests.",
      "id": "GSD-2022-42327",
      "modified": "2023-12-13T01:19:10.495086Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "security@xen.org",
        "ID": "CVE-2022-42327",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "xen",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "?",
                          "version_value": "consult Xen advisory XSA-412"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "Xen"
            }
          ]
        }
      },
      "configuration": {
        "configuration_data": {
          "description": {
            "description_data": [
              {
                "lang": "eng",
                "value": "Only Xen version 4.16 is vulnerable.  Other Xen versions are not vulnerable.\n\nx86 HVM or PVH guests running on Intel systems with the \"virtualize APIC\naccesses\" feature are affected.  This is believed to be all 64-bit\ncapable Intel CPUs.\n\nx86 HVM or PVH guests running on AMD hardware, Arm or x86 PV guests are\nnot affected."
              }
            ]
          }
        }
      },
      "credit": {
        "credit_data": {
          "description": {
            "description_data": [
              {
                "lang": "eng",
                "value": "This issue was discovered by Andrew Cooper of Citrix."
              }
            ]
          }
        }
      },
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "x86: unintended memory sharing between guests On Intel systems that support the \"virtualize APIC accesses\" feature, a guest can read and write the global shared xAPIC page by moving the local APIC out of xAPIC mode. Access to this shared page bypasses the expected isolation that should exist between two guests."
          }
        ]
      },
      "impact": {
        "impact_data": {
          "description": {
            "description_data": [
              {
                "lang": "eng",
                "value": "Guests are able to access an unintended shared memory page.  Note the\ncontents of the page are not interpreted by Xen or hardware."
              }
            ]
          }
        }
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "unknown"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://xenbits.xenproject.org/xsa/advisory-412.txt",
            "refsource": "MISC",
            "url": "https://xenbits.xenproject.org/xsa/advisory-412.txt"
          },
          {
            "name": "http://xenbits.xen.org/xsa/advisory-412.html",
            "refsource": "CONFIRM",
            "url": "http://xenbits.xen.org/xsa/advisory-412.html"
          },
          {
            "name": "[oss-security] 20221101 Xen Security Advisory 412 v2 (CVE-2022-42327) - x86: unintended memory sharing between guests",
            "refsource": "MLIST",
            "url": "http://www.openwall.com/lists/oss-security/2022/11/01/3"
          },
          {
            "name": "FEDORA-2022-07438e12df",
            "refsource": "FEDORA",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZLI2NPNEH7CNJO3VZGQNOI4M4EWLNKPZ/"
          },
          {
            "name": "FEDORA-2022-9f51d13fa3",
            "refsource": "FEDORA",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/YTMITQBGC23MSDHUCAPCVGLMVXIBXQTQ/"
          },
          {
            "name": "GLSA-202402-07",
            "refsource": "GENTOO",
            "url": "https://security.gentoo.org/glsa/202402-07"
          }
        ]
      },
      "workaround": {
        "workaround_data": {
          "description": {
            "description_data": [
              {
                "lang": "eng",
                "value": "Only running PV guests will mitigate the vulnerability on affected\nhardware."
              }
            ]
          }
        }
      }
    },
    "nvd.nist.gov": {
      "cve": {
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:xen:xen:4.16:*:*:*:*:*:x86:*",
                    "matchCriteriaId": "6FE831CB-F53C-4801-8746-DC77C8A36534",
                    "vulnerable": true
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                "negate": false,
                "operator": "OR"
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        ],
        "descriptions": [
          {
            "lang": "en",
            "value": "x86: unintended memory sharing between guests On Intel systems that support the \"virtualize APIC accesses\" feature, a guest can read and write the global shared xAPIC page by moving the local APIC out of xAPIC mode. Access to this shared page bypasses the expected isolation that should exist between two guests."
          },
          {
            "lang": "es",
            "value": "x86: intercambio de memoria no deseado entre invitados En los sistemas Intel que admiten la funci\u00f3n \"virtualizar accesos APIC\", un invitado puede leer y escribir la p\u00e1gina xAPIC compartida global sacando el APIC local del modo xAPIC. El acceso a esta p\u00e1gina compartida evita el aislamiento esperado que deber\u00eda existir entre dos invitados."
          }
        ],
        "id": "CVE-2022-42327",
        "lastModified": "2024-02-04T08:15:12.970",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "NONE",
                "baseScore": 7.1,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.2,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2022-11-01T13:15:12.163",
        "references": [
          {
            "source": "security@xen.org",
            "tags": [
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              "Patch",
              "Third Party Advisory"
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            "url": "http://xenbits.xen.org/xsa/advisory-412.html"
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          },
          {
            "source": "security@xen.org",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZLI2NPNEH7CNJO3VZGQNOI4M4EWLNKPZ/"
          },
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            "url": "https://xenbits.xenproject.org/xsa/advisory-412.txt"
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        "sourceIdentifier": "security@xen.org",
        "vulnStatus": "Modified",
        "weaknesses": [
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            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    }
  }
}


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  • 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.
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