cvelistv5 - CVE-2022-42336

▼	URL	Tags
	security@xen.org	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LTO3U3WYLAZW3KLPKJZ332FYUREXPZMQ/
	security@xen.org	https://xenbits.xenproject.org/xsa/advisory-431.txt	Vendor Advisory

▼	Vendor	Product
	Xen	xen

ghsa-79pv-m8fc-mhfj

Vulnerability from github

Published

2023-05-17 03:30

Modified

2024-04-04 04:12

Severity ?

3.3 (Low) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Details

Mishandling of guest SSBD selection on AMD hardware The current logic to set SSBD on AMD Family 17h and Hygon Family 18h processors requires that the setting of SSBD is coordinated at a core level, as the setting is shared between threads. Logic was introduced to keep track of how many threads require SSBD active in order to coordinate it, such logic relies on using a per-core counter of threads that have SSBD active. When running on the mentioned hardware, it's possible for a guest to under or overflow the thread counter, because each write to VIRT_SPEC_CTRL.SSBD by the guest gets propagated to the helper that does the per-core active accounting. Underflowing the counter causes the value to get saturated, and thus attempts for guests running on the same core to set SSBD won't have effect because the hypervisor assumes it's already active.

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{
  "affected": [],
  "aliases": [
    "CVE-2022-42336"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2023-05-17T01:15:09Z",
    "severity": "LOW"
  },
  "details": "Mishandling of guest SSBD selection on AMD hardware The current logic to set SSBD on AMD Family 17h and Hygon Family 18h processors requires that the setting of SSBD is coordinated at a core level, as the setting is shared between threads. Logic was introduced to keep track of how many threads require SSBD active in order to coordinate it, such logic relies on using a per-core counter of threads that have SSBD active. When running on the mentioned hardware, it\u0027s possible for a guest to under or overflow the thread counter, because each write to VIRT_SPEC_CTRL.SSBD by the guest gets propagated to the helper that does the per-core active accounting. Underflowing the counter causes the value to get saturated, and thus attempts for guests running on the same core to set SSBD won\u0027t have effect because the hypervisor assumes it\u0027s already active.",
  "id": "GHSA-79pv-m8fc-mhfj",
  "modified": "2024-04-04T04:12:47Z",
  "published": "2023-05-17T03:30:16Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-42336"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LTO3U3WYLAZW3KLPKJZ332FYUREXPZMQ"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LTO3U3WYLAZW3KLPKJZ332FYUREXPZMQ"
    },
    {
      "type": "WEB",
      "url": "https://xenbits.xenproject.org/xsa/advisory-431.txt"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

gsd-2022-42336

Vulnerability from gsd

Modified

2023-12-13 01:19

Details

Mishandling of guest SSBD selection on AMD hardware The current logic to set SSBD on AMD Family 17h and Hygon Family 18h processors requires that the setting of SSBD is coordinated at a core level, as the setting is shared between threads. Logic was introduced to keep track of how many threads require SSBD active in order to coordinate it, such logic relies on using a per-core counter of threads that have SSBD active. When running on the mentioned hardware, it's possible for a guest to under or overflow the thread counter, because each write to VIRT_SPEC_CTRL.SSBD by the guest gets propagated to the helper that does the per-core active accounting. Underflowing the counter causes the value to get saturated, and thus attempts for guests running on the same core to set SSBD won't have effect because the hypervisor assumes it's already active.

Aliases

CVE-2022-42336

Aliases

CVE-2022-42336

JSON

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{
  "GSD": {
    "alias": "CVE-2022-42336",
    "id": "GSD-2022-42336"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2022-42336"
      ],
      "details": "Mishandling of guest SSBD selection on AMD hardware The current logic to set SSBD on AMD Family 17h and Hygon Family 18h processors requires that the setting of SSBD is coordinated at a core level, as the setting is shared between threads. Logic was introduced to keep track of how many threads require SSBD active in order to coordinate it, such logic relies on using a per-core counter of threads that have SSBD active. When running on the mentioned hardware, it\u0027s possible for a guest to under or overflow the thread counter, because each write to VIRT_SPEC_CTRL.SSBD by the guest gets propagated to the helper that does the per-core active accounting. Underflowing the counter causes the value to get saturated, and thus attempts for guests running on the same core to set SSBD won\u0027t have effect because the hypervisor assumes it\u0027s already active.",
      "id": "GSD-2022-42336",
      "modified": "2023-12-13T01:19:10.956684Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "security@xen.org",
        "ID": "CVE-2022-42336",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "xen",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "?",
                          "version_value": "consult Xen advisory XSA-431"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "Xen"
            }
          ]
        }
      },
      "configuration": {
        "configuration_data": {
          "description": {
            "description_data": [
              {
                "lang": "eng",
                "value": "Only Xen version 4.17 is vulnerable.\n\nOnly x86 AMD systems are vulnerable.  The vulnerability can be leveraged\nby and affects only HVM guests."
              }
            ]
          }
        }
      },
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "Mishandling of guest SSBD selection on AMD hardware The current logic to set SSBD on AMD Family 17h and Hygon Family 18h processors requires that the setting of SSBD is coordinated at a core level, as the setting is shared between threads. Logic was introduced to keep track of how many threads require SSBD active in order to coordinate it, such logic relies on using a per-core counter of threads that have SSBD active. When running on the mentioned hardware, it\u0027s possible for a guest to under or overflow the thread counter, because each write to VIRT_SPEC_CTRL.SSBD by the guest gets propagated to the helper that does the per-core active accounting. Underflowing the counter causes the value to get saturated, and thus attempts for guests running on the same core to set SSBD won\u0027t have effect because the hypervisor assumes it\u0027s already active."
          }
        ]
      },
      "impact": {
        "impact_data": {
          "description": {
            "description_data": [
              {
                "lang": "eng",
                "value": "An attacker with control over a guest can mislead other guests into\nobserving SSBD active when it is not."
              }
            ]
          }
        }
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "unknown"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://xenbits.xenproject.org/xsa/advisory-431.txt",
            "refsource": "MISC",
            "url": "https://xenbits.xenproject.org/xsa/advisory-431.txt"
          },
          {
            "name": "FEDORA-2023-8334fe0ecb",
            "refsource": "FEDORA",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LTO3U3WYLAZW3KLPKJZ332FYUREXPZMQ/"
          }
        ]
      },
      "workaround": {
        "workaround_data": {
          "description": {
            "description_data": [
              {
                "lang": "eng",
                "value": "Running PV guests only will prevent the vulnerability.\n\nSetting `spec-ctrl=ssbd` on the hypervisor command line will force SSBD\nto be unconditionally active."
              }
            ]
          }
        }
      }
    },
    "nvd.nist.gov": {
      "configurations": {
        "CVE_data_version": "4.0",
        "nodes": [
          {
            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:o:xen:xen:4.17:*:*:*:*:*:x86:*",
                "cpe_name": [],
                "vulnerable": true
              }
            ],
            "operator": "OR"
          }
        ]
      },
      "cve": {
        "CVE_data_meta": {
          "ASSIGNER": "security@xen.org",
          "ID": "CVE-2022-42336"
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "en",
              "value": "Mishandling of guest SSBD selection on AMD hardware The current logic to set SSBD on AMD Family 17h and Hygon Family 18h processors requires that the setting of SSBD is coordinated at a core level, as the setting is shared between threads. Logic was introduced to keep track of how many threads require SSBD active in order to coordinate it, such logic relies on using a per-core counter of threads that have SSBD active. When running on the mentioned hardware, it\u0027s possible for a guest to under or overflow the thread counter, because each write to VIRT_SPEC_CTRL.SSBD by the guest gets propagated to the helper that does the per-core active accounting. Underflowing the counter causes the value to get saturated, and thus attempts for guests running on the same core to set SSBD won\u0027t have effect because the hypervisor assumes it\u0027s already active."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "en",
                  "value": "NVD-CWE-noinfo"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://xenbits.xenproject.org/xsa/advisory-431.txt",
              "refsource": "MISC",
              "tags": [
                "Vendor Advisory"
              ],
              "url": "https://xenbits.xenproject.org/xsa/advisory-431.txt"
            },
            {
              "name": "FEDORA-2023-8334fe0ecb",
              "refsource": "FEDORA",
              "tags": [],
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LTO3U3WYLAZW3KLPKJZ332FYUREXPZMQ/"
            }
          ]
        }
      },
      "impact": {
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 3.3,
            "baseSeverity": "LOW",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 1.8,
          "impactScore": 1.4
        }
      },
      "lastModifiedDate": "2023-05-27T03:15Z",
      "publishedDate": "2023-05-17T01:15Z"
    }
  }
}

wid-sec-w-2023-1234

Vulnerability from csaf_certbund

Published

2023-05-16 22:00

Modified

2023-06-18 22:00

Summary

Xen: 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

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 falsche Informationen darzustellen.

Betroffene Betriebssysteme

- Linux

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 lokaler Angreifer kann eine Schwachstelle in Xen ausnutzen, um falsche Informationen darzustellen.",
        "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-2023-1234 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2023/wid-sec-w-2023-1234.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2023-1234 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2023-1234"
      },
      {
        "category": "external",
        "summary": "SUSE Security Update SUSE-SU-2023:2535-1 vom 2023-06-19",
        "url": "https://lists.suse.com/pipermail/sle-security-updates/2023-June/015230.html"
      },
      {
        "category": "external",
        "summary": "Xen Security Advisory CVE-2022-42336 / XSA-431 vom 2023-05-16",
        "url": "https://xenbits.xen.org/xsa/advisory-431.html"
      }
    ],
    "source_lang": "en-US",
    "title": "Xen: Schwachstelle erm\u00f6glicht Darstellen falscher Informationen",
    "tracking": {
      "current_release_date": "2023-06-18T22:00:00.000+00:00",
      "generator": {
        "date": "2024-02-15T17:27:59.328+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.3.0"
        }
      },
      "id": "WID-SEC-W-2023-1234",
      "initial_release_date": "2023-05-16T22:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2023-05-16T22:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        },
        {
          "date": "2023-06-18T22:00:00.000+00:00",
          "number": "2",
          "summary": "Neue Updates von SUSE aufgenommen"
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "category": "product_name",
            "name": "Fedora Linux",
            "product": {
              "name": "Fedora Linux",
              "product_id": "74178",
              "product_identification_helper": {
                "cpe": "cpe:/o:fedoraproject:fedora:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "Fedora"
      },
      {
        "branches": [
          {
            "category": "product_name",
            "name": "Open Source Xen 4.17",
            "product": {
              "name": "Open Source Xen 4.17",
              "product_id": "T026025",
              "product_identification_helper": {
                "cpe": "cpe:/o:xen:xen:4.17"
              }
            }
          }
        ],
        "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-2022-42336",
      "notes": [
        {
          "category": "description",
          "text": "Es besteht eine Schwachstelle in Xen, wenn es auf \"AMD Family 17h\" oder \"Hygon Family 18h\" Prozessoren l\u00e4uft. Aufgrund eines Logikfehlers in der \"SSBD\"-Implementierung kann ein Gastsystem den Thread-Z\u00e4hler unter- oder \u00fcberlaufen lassen, was zu einem falschen Z\u00e4hlwert f\u00fchrt. Ein Angreifer aus einem Gastsystem kann dies ausnutzen, um dem Hypervisor einen falschen Z\u00e4hlerwert vorzugeben."
        }
      ],
      "product_status": {
        "known_affected": [
          "T002207",
          "74178",
          "T026025"
        ]
      },
      "release_date": "2023-05-16T22:00:00Z",
      "title": "CVE-2022-42336"
    }
  ]
}

CVE-2022-42336

Vulnerability from cvelistv5

Tags

Sightings

Nomenclature

Action not permitted

CVE-2022-42336

Vulnerability from cvelistv5

ghsa-79pv-m8fc-mhfj

Vulnerability from github

gsd-2022-42336

Vulnerability from gsd

wid-sec-w-2023-1234

Vulnerability from csaf_certbund

Tags

Sightings

Nomenclature