certfr_avis - certfr-2024-avi-0963

CERTFR-2024-AVI-0963

Vulnerability from certfr_avis

De multiples vulnérabilités ont été découvertes dans Xen. Elles permettent à un attaquant de provoquer un déni de service à distance et une atteinte à la confidentialité des données.

Solutions

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

Impacted products

	Vendor	Product	Description
	XEN	Xen	Xen versions 4.6.x à 4.19.x sans les derniers correctifs de sécurité

References

Title

Publication Time

Tags

Bulletin de sécurité Xen xsa/advisory-464	2024-11-12	vendor-advisory
Bulletin de sécurité Xen xsa/advisory-463	2024-11-12	vendor-advisory

Show details on source website

JSON

To clipboard

{
  "$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
  "affected_systems": [
    {
      "description": "Xen versions 4.6.x \u00e0 4.19.x sans les derniers correctifs de s\u00e9curit\u00e9",
      "product": {
        "name": "Xen",
        "vendor": {
          "name": "XEN",
          "scada": false
        }
      }
    }
  ],
  "affected_systems_content": "",
  "content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
  "cves": [
    {
      "name": "CVE-2024-45818",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-45818"
    },
    {
      "name": "CVE-2024-45819",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-45819"
    }
  ],
  "initial_release_date": "2024-11-12T00:00:00",
  "last_revision_date": "2024-11-12T00:00:00",
  "links": [],
  "reference": "CERTFR-2024-AVI-0963",
  "revisions": [
    {
      "description": "Version initiale",
      "revision_date": "2024-11-12T00:00:00.000000"
    }
  ],
  "risks": [
    {
      "description": "D\u00e9ni de service \u00e0 distance"
    },
    {
      "description": "Atteinte \u00e0 la confidentialit\u00e9 des donn\u00e9es"
    }
  ],
  "summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans Xen. Elles permettent \u00e0 un attaquant de provoquer un d\u00e9ni de service \u00e0 distance et une atteinte \u00e0 la confidentialit\u00e9 des donn\u00e9es.",
  "title": "Multiples vuln\u00e9rabilit\u00e9s dans Xen",
  "vendor_advisories": [
    {
      "published_at": "2024-11-12",
      "title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-464",
      "url": "https://xenbits.xen.org/xsa/advisory-464.html"
    },
    {
      "published_at": "2024-11-12",
      "title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-463",
      "url": "https://xenbits.xen.org/xsa/advisory-463.html"
    }
  ]
}

CVE-2024-45819 (GCVE-0-2024-45819)

Vulnerability from cvelistv5

Published

2024-12-19 12:00

Modified

2024-12-31 18:57

Severity ?

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

Summary

PVH guests have their ACPI tables constructed by the toolstack. The construction involves building the tables in local memory, which are then copied into guest memory. While actually used parts of the local memory are filled in correctly, excess space that is being allocated is left with its prior contents.

References

URL

Tags

https://xenbits.xenproject.org/xsa/advisory-464.html

Impacted products

	Vendor	Product	Version
	Xen	Xen

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-12-19T12:04:50.065Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2024/11/12/1"
          },
          {
            "url": "http://xenbits.xen.org/xsa/advisory-464.html"
          },
          {
            "url": "http://www.openwall.com/lists/oss-security/2024/11/12/10"
          },
          {
            "url": "http://www.openwall.com/lists/oss-security/2024/11/12/7"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "NONE",
              "baseScore": 5.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2024-45819",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-12-31T18:56:31.915960Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-276",
                "description": "CWE-276 Incorrect Default Permissions",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-12-31T18:57:41.513Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "product": "Xen",
          "vendor": "Xen",
          "versions": [
            {
              "status": "unknown",
              "version": "consult Xen advisory XSA-464"
            }
          ]
        }
      ],
      "configurations": [
        {
          "lang": "en",
          "value": "Xen versions 4.8 and onwards are vulnerable.  Xen 4.7 and older are not\nvulnerable.\n\nOnly x86 systems running PVH guests are vulnerable.  Architectures other\nthan x86 are not vulnerable.\n\nOnly PVH guests can leverage the vulnerability.  HVM and PV guests\ncannot leverage the vulnerability.  Note that PV guests when run inside\nthe (PVH) shim can\u0027t leverage the vulnerability."
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "This issue was discovered by Jason Andryuk of AMD."
        }
      ],
      "datePublic": "2024-11-12T12:00:00Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "PVH guests have their ACPI tables constructed by the toolstack.  The\nconstruction involves building the tables in local memory, which are\nthen copied into guest memory.  While actually used parts of the local\nmemory are filled in correctly, excess space that is being allocated is\nleft with its prior contents."
        }
      ],
      "impacts": [
        {
          "descriptions": [
            {
              "lang": "en",
              "value": "An unprivileged guest may be able to access sensitive information\npertaining to the host, control domain, or other guests."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-12-19T12:00:50.271Z",
        "orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
        "shortName": "XEN"
      },
      "references": [
        {
          "url": "https://xenbits.xenproject.org/xsa/advisory-464.html"
        }
      ],
      "title": "libxl leaks data to PVH guests via ACPI tables",
      "workarounds": [
        {
          "lang": "en",
          "value": "Running only PV or HVM guests will avoid this vulnerability."
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
    "assignerShortName": "XEN",
    "cveId": "CVE-2024-45819",
    "datePublished": "2024-12-19T12:00:50.271Z",
    "dateReserved": "2024-09-09T14:43:11.826Z",
    "dateUpdated": "2024-12-31T18:57:41.513Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

CVE-2024-45818 (GCVE-0-2024-45818)

Vulnerability from cvelistv5

Published

2024-12-19 12:00

Modified

2024-12-31 19:01

Severity ?

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

Summary

The hypervisor contains code to accelerate VGA memory accesses for HVM guests, when the (virtual) VGA is in "standard" mode. Locking involved there has an unusual discipline, leaving a lock acquired past the return from the function that acquired it. This behavior results in a problem when emulating an instruction with two memory accesses, both of which touch VGA memory (plus some further constraints which aren't relevant here). When emulating the 2nd access, the lock that is already being held would be attempted to be re-acquired, resulting in a deadlock. This deadlock was already found when the code was first introduced, but was analysed incorrectly and the fix was incomplete. Analysis in light of the new finding cannot find a way to make the existing locking discipline work. In staging, this logic has all been removed because it was discovered to be accidentally disabled since Xen 4.7. Therefore, we are fixing the locking problem by backporting the removal of most of the feature. Note that even with the feature disabled, the lock would still be acquired for any accesses to the VGA MMIO region.

References

URL

Tags

https://xenbits.xenproject.org/xsa/advisory-463.html

Impacted products

	Vendor	Product	Version
	Xen	Xen

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-12-19T12:04:41.161Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2024/11/12/2"
          },
          {
            "url": "http://xenbits.xen.org/xsa/advisory-463.html"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "NONE",
              "baseScore": 6.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "CHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2024-45818",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-12-31T18:59:24.741670Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-667",
                "description": "CWE-667 Improper Locking",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-12-31T19:01:43.510Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "product": "Xen",
          "vendor": "Xen",
          "versions": [
            {
              "status": "unknown",
              "version": "consult Xen advisory XSA-463"
            }
          ]
        }
      ],
      "configurations": [
        {
          "lang": "en",
          "value": "Xen versions 4.6 through 4.19 are vulnerable.  Staging (4.20 dev) is\nnot vulnerable; as noted above, the functionality was already removed\nprior to the discovery of this issue.\n\nOnly x86 systems running HVM guests are vulnerable.  Architectures other\nthan x86 are not vulnerable.\n\nOnly HVM guests can leverage the vulnerability.  PVH and PV guests\ncannot leverage the vulnerability."
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "This issue was discovered by Manuel Andreas of Technical University of\nMunich."
        }
      ],
      "datePublic": "2024-11-12T12:00:00Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "The hypervisor contains code to accelerate VGA memory accesses for HVM\nguests, when the (virtual) VGA is in \"standard\" mode.  Locking involved\nthere has an unusual discipline, leaving a lock acquired past the\nreturn from the function that acquired it.  This behavior results in a\nproblem when emulating an instruction with two memory accesses, both of\nwhich touch VGA memory (plus some further constraints which aren\u0027t\nrelevant here).  When emulating the 2nd access, the lock that is already\nbeing held would be attempted to be re-acquired, resulting in a\ndeadlock.\n\nThis deadlock was already found when the code was first introduced, but\nwas analysed incorrectly and the fix was incomplete.  Analysis in light\nof the new finding cannot find a way to make the existing locking\ndiscipline work.\n\nIn staging, this logic has all been removed because it was discovered\nto be accidentally disabled since Xen 4.7.  Therefore, we are fixing the\nlocking problem by backporting the removal of most of the feature.  Note\nthat even with the feature disabled, the lock would still be acquired\nfor any accesses to the VGA MMIO region."
        }
      ],
      "impacts": [
        {
          "descriptions": [
            {
              "lang": "en",
              "value": "A (not necessarily malicious) HVM guest kernel can lock up the entire\nhost."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-12-19T12:00:41.413Z",
        "orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
        "shortName": "XEN"
      },
      "references": [
        {
          "url": "https://xenbits.xenproject.org/xsa/advisory-463.html"
        }
      ],
      "title": "Deadlock in x86 HVM standard VGA handling",
      "workarounds": [
        {
          "lang": "en",
          "value": "Running only PV or PVH guests will avoid this vulnerability."
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
    "assignerShortName": "XEN",
    "cveId": "CVE-2024-45818",
    "datePublished": "2024-12-19T12:00:41.413Z",
    "dateReserved": "2024-09-09T14:43:11.826Z",
    "dateUpdated": "2024-12-31T19:01:43.510Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Tags

Taxonomy of the tags.

All sightings related to this event Export sightings related to this event

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.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
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.

Action not permitted

CERTFR-2024-AVI-0963

Vulnerability from certfr_avis

Solutions

CVE-2024-45819 (GCVE-0-2024-45819)

Vulnerability from cvelistv5

CVE-2024-45818 (GCVE-0-2024-45818)

Vulnerability from cvelistv5

Tags

Sightings

Nomenclature