certfr_avis - certfr-2020-avi-418

CERTFR-2020-AVI-418

Vulnerability from certfr_avis

De multiples vulnérabilités ont été découvertes dans Citrix Hypervisor. Elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance et un déni de service à distance.

Solution

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

None

Impacted products

Vendor	Product	Description
Citrix	Citrix Hypervisor	Citrix XenServer 7.0 sans le correctif de sécurité XS70E080
Citrix	Citrix Hypervisor	Citrix XenServer 7.1 LTSR CU2 sans le correctif de sécurité XS80E013
Citrix	Citrix Hypervisor	Citrix Hypervisor 8.0 sans le correctif de sécurité XS71ECU2042
Citrix	Citrix Hypervisor	Citrix Hypervisor 8.1 sans le correctif de sécurité XS81E006
Citrix	Citrix Hypervisor	Citrix Hypervisor 8.2 LTSR sans le correctif de sécurité XS82E001

References

Title

Publication Time

Tags

Bulletin de sécurité Citrix CTX277456 du 08 juillet 2020

None

vendor-advisory

Show details on source website

JSON

To clipboard

{
  "$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
  "affected_systems": [
    {
      "description": "Citrix XenServer 7.0 sans le correctif de s\u00e9curit\u00e9 XS70E080",
      "product": {
        "name": "Citrix Hypervisor",
        "vendor": {
          "name": "Citrix",
          "scada": false
        }
      }
    },
    {
      "description": "Citrix XenServer 7.1 LTSR CU2 sans le correctif de s\u00e9curit\u00e9 XS80E013",
      "product": {
        "name": "Citrix Hypervisor",
        "vendor": {
          "name": "Citrix",
          "scada": false
        }
      }
    },
    {
      "description": "Citrix Hypervisor 8.0 sans le correctif de s\u00e9curit\u00e9 XS71ECU2042",
      "product": {
        "name": "Citrix Hypervisor",
        "vendor": {
          "name": "Citrix",
          "scada": false
        }
      }
    },
    {
      "description": "Citrix Hypervisor 8.1 sans le correctif de s\u00e9curit\u00e9 XS81E006",
      "product": {
        "name": "Citrix Hypervisor",
        "vendor": {
          "name": "Citrix",
          "scada": false
        }
      }
    },
    {
      "description": "Citrix Hypervisor 8.2 LTSR sans le correctif de s\u00e9curit\u00e9 XS82E001",
      "product": {
        "name": "Citrix Hypervisor",
        "vendor": {
          "name": "Citrix",
          "scada": false
        }
      }
    }
  ],
  "affected_systems_content": null,
  "content": "## Solution\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des\ncorrectifs (cf. section Documentation).\n",
  "cves": [
    {
      "name": "CVE-2020-15563",
      "url": "https://www.cve.org/CVERecord?id=CVE-2020-15563"
    },
    {
      "name": "CVE-2020-15565",
      "url": "https://www.cve.org/CVERecord?id=CVE-2020-15565"
    }
  ],
  "initial_release_date": "2020-07-09T00:00:00",
  "last_revision_date": "2020-07-09T00:00:00",
  "links": [],
  "reference": "CERTFR-2020-AVI-418",
  "revisions": [
    {
      "description": "Version initiale",
      "revision_date": "2020-07-09T00:00:00.000000"
    }
  ],
  "risks": [
    {
      "description": "D\u00e9ni de service \u00e0 distance"
    },
    {
      "description": "Ex\u00e9cution de code arbitraire \u00e0 distance"
    }
  ],
  "summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans Citrix Hypervisor.\nElles permettent \u00e0 un attaquant de provoquer une ex\u00e9cution de code\narbitraire \u00e0 distance et un d\u00e9ni de service \u00e0 distance.\n",
  "title": "Multiples vuln\u00e9rabilit\u00e9s dans Citrix Hypervisor",
  "vendor_advisories": [
    {
      "published_at": null,
      "title": "Bulletin de s\u00e9curit\u00e9 Citrix CTX277456 du 08 juillet 2020",
      "url": "https://support.citrix.com/article/CTX277456"
    }
  ]
}

CVE-2020-15565 (GCVE-0-2020-15565)

Vulnerability from cvelistv5

Published

2020-07-07 12:25

Modified

2024-08-04 13:22

Severity ?

CWE

Summary

An issue was discovered in Xen through 4.13.x, allowing x86 Intel HVM guest OS users to cause a host OS denial of service or possibly gain privileges because of insufficient cache write-back under VT-d. When page tables are shared between IOMMU and CPU, changes to them require flushing of both TLBs. Furthermore, IOMMUs may be non-coherent, and hence prior to flushing IOMMU TLBs, a CPU cache also needs writing back to memory after changes were made. Such writing back of cached data was missing in particular when splitting large page mappings into smaller granularity ones. A malicious guest may be able to retain read/write DMA access to frames returned to Xen's free pool, and later reused for another purpose. Host crashes (leading to a Denial of Service) and privilege escalation cannot be ruled out. Xen versions from at least 3.2 onwards are affected. Only x86 Intel systems are affected. x86 AMD as well as Arm systems are not affected. Only x86 HVM guests using hardware assisted paging (HAP), having a passed through PCI device assigned, and having page table sharing enabled can leverage the vulnerability. Note that page table sharing will be enabled (by default) only if Xen considers IOMMU and CPU large page size support compatible.

References

URL

Tags

	http://xenbits.xen.org/xsa/advisory-321.html	x_refsource_MISC
	http://www.openwall.com/lists/oss-security/2020/07/07/4	mailing-list, x_refsource_MLIST
	https://www.debian.org/security/2020/dsa-4723	vendor-advisory, x_refsource_DEBIAN
	http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00024.html	vendor-advisory, x_refsource_SUSE
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VB3QJJZV23Z2IDYEMIHELWYSQBUEW6JP/	vendor-advisory, x_refsource_FEDORA
	http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00031.html	vendor-advisory, x_refsource_SUSE
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MXESCOVI7AVRNC7HEAMFM7PMEO6D3AUH/	vendor-advisory, x_refsource_FEDORA
	https://security.gentoo.org/glsa/202007-02	vendor-advisory, x_refsource_GENTOO

Impacted products

	Vendor	Product	Version
	n/a	n/a	Version: n/a

Show details on NVD website

JSON

To clipboard

{
  "containers": {
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      {
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            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VB3QJJZV23Z2IDYEMIHELWYSQBUEW6JP/"
          },
          {
            "name": "openSUSE-SU-2020:0985",
            "tags": [
              "vendor-advisory",
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            "url": "http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00031.html"
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            "tags": [
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            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MXESCOVI7AVRNC7HEAMFM7PMEO6D3AUH/"
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          {
            "name": "GLSA-202007-02",
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            "url": "https://security.gentoo.org/glsa/202007-02"
          }
        ],
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          "value": "An issue was discovered in Xen through 4.13.x, allowing x86 Intel HVM guest OS users to cause a host OS denial of service or possibly gain privileges because of insufficient cache write-back under VT-d. When page tables are shared between IOMMU and CPU, changes to them require flushing of both TLBs. Furthermore, IOMMUs may be non-coherent, and hence prior to flushing IOMMU TLBs, a CPU cache also needs writing back to memory after changes were made. Such writing back of cached data was missing in particular when splitting large page mappings into smaller granularity ones. A malicious guest may be able to retain read/write DMA access to frames returned to Xen\u0027s free pool, and later reused for another purpose. Host crashes (leading to a Denial of Service) and privilege escalation cannot be ruled out. Xen versions from at least 3.2 onwards are affected. Only x86 Intel systems are affected. x86 AMD as well as Arm systems are not affected. Only x86 HVM guests using hardware assisted paging (HAP), having a passed through PCI device assigned, and having page table sharing enabled can leverage the vulnerability. Note that page table sharing will be enabled (by default) only if Xen considers IOMMU and CPU large page size support compatible."
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        {
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          ],
          "url": "http://www.openwall.com/lists/oss-security/2020/07/07/4"
        },
        {
          "name": "DSA-4723",
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        },
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          "tags": [
            "vendor-advisory",
            "x_refsource_SUSE"
          ],
          "url": "http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00024.html"
        },
        {
          "name": "FEDORA-2020-fbc13516af",
          "tags": [
            "vendor-advisory",
            "x_refsource_FEDORA"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VB3QJJZV23Z2IDYEMIHELWYSQBUEW6JP/"
        },
        {
          "name": "openSUSE-SU-2020:0985",
          "tags": [
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            "x_refsource_SUSE"
          ],
          "url": "http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00031.html"
        },
        {
          "name": "FEDORA-2020-76cf2b0f0a",
          "tags": [
            "vendor-advisory",
            "x_refsource_FEDORA"
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          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MXESCOVI7AVRNC7HEAMFM7PMEO6D3AUH/"
        },
        {
          "name": "GLSA-202007-02",
          "tags": [
            "vendor-advisory",
            "x_refsource_GENTOO"
          ],
          "url": "https://security.gentoo.org/glsa/202007-02"
        }
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              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MXESCOVI7AVRNC7HEAMFM7PMEO6D3AUH/"
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    "datePublished": "2020-07-07T12:25:00",
    "dateReserved": "2020-07-06T00:00:00",
    "dateUpdated": "2024-08-04T13:22:29.188Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

CVE-2020-15563 (GCVE-0-2020-15563)

Vulnerability from cvelistv5

Published

2020-07-07 12:23

Modified

2024-08-04 13:22

Severity ?

CWE

Summary

An issue was discovered in Xen through 4.13.x, allowing x86 HVM guest OS users to cause a hypervisor crash. An inverted conditional in x86 HVM guests' dirty video RAM tracking code allows such guests to make Xen de-reference a pointer guaranteed to point at unmapped space. A malicious or buggy HVM guest may cause the hypervisor to crash, resulting in Denial of Service (DoS) affecting the entire host. Xen versions from 4.8 onwards are affected. Xen versions 4.7 and earlier are not affected. Only x86 systems are affected. Arm systems are not affected. Only x86 HVM guests using shadow paging can leverage the vulnerability. In addition, there needs to be an entity actively monitoring a guest's video frame buffer (typically for display purposes) in order for such a guest to be able to leverage the vulnerability. x86 PV guests, as well as x86 HVM guests using hardware assisted paging (HAP), cannot leverage the vulnerability.

References

URL

Tags

	http://xenbits.xen.org/xsa/advisory-319.html	x_refsource_MISC
	http://www.openwall.com/lists/oss-security/2020/07/07/3	mailing-list, x_refsource_MLIST
	https://www.debian.org/security/2020/dsa-4723	vendor-advisory, x_refsource_DEBIAN
	http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00024.html	vendor-advisory, x_refsource_SUSE
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VB3QJJZV23Z2IDYEMIHELWYSQBUEW6JP/	vendor-advisory, x_refsource_FEDORA
	http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00031.html	vendor-advisory, x_refsource_SUSE
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MXESCOVI7AVRNC7HEAMFM7PMEO6D3AUH/	vendor-advisory, x_refsource_FEDORA
	https://security.gentoo.org/glsa/202007-02	vendor-advisory, x_refsource_GENTOO

Impacted products

	Vendor	Product	Version
	n/a	n/a	Version: n/a

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T13:22:29.273Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "http://xenbits.xen.org/xsa/advisory-319.html"
          },
          {
            "name": "[oss-security] 20200707 Xen Security Advisory 319 v3 (CVE-2020-15563) - inverted code paths in x86 dirty VRAM tracking",
            "tags": [
              "mailing-list",
              "x_refsource_MLIST",
              "x_transferred"
            ],
            "url": "http://www.openwall.com/lists/oss-security/2020/07/07/3"
          },
          {
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            "tags": [
              "vendor-advisory",
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            "url": "https://www.debian.org/security/2020/dsa-4723"
          },
          {
            "name": "openSUSE-SU-2020:0965",
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              "x_refsource_SUSE",
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            "url": "http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00024.html"
          },
          {
            "name": "FEDORA-2020-fbc13516af",
            "tags": [
              "vendor-advisory",
              "x_refsource_FEDORA",
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VB3QJJZV23Z2IDYEMIHELWYSQBUEW6JP/"
          },
          {
            "name": "openSUSE-SU-2020:0985",
            "tags": [
              "vendor-advisory",
              "x_refsource_SUSE",
              "x_transferred"
            ],
            "url": "http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00031.html"
          },
          {
            "name": "FEDORA-2020-76cf2b0f0a",
            "tags": [
              "vendor-advisory",
              "x_refsource_FEDORA",
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MXESCOVI7AVRNC7HEAMFM7PMEO6D3AUH/"
          },
          {
            "name": "GLSA-202007-02",
            "tags": [
              "vendor-advisory",
              "x_refsource_GENTOO",
              "x_transferred"
            ],
            "url": "https://security.gentoo.org/glsa/202007-02"
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        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
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          "product": "n/a",
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        {
          "lang": "en",
          "value": "An issue was discovered in Xen through 4.13.x, allowing x86 HVM guest OS users to cause a hypervisor crash. An inverted conditional in x86 HVM guests\u0027 dirty video RAM tracking code allows such guests to make Xen de-reference a pointer guaranteed to point at unmapped space. A malicious or buggy HVM guest may cause the hypervisor to crash, resulting in Denial of Service (DoS) affecting the entire host. Xen versions from 4.8 onwards are affected. Xen versions 4.7 and earlier are not affected. Only x86 systems are affected. Arm systems are not affected. Only x86 HVM guests using shadow paging can leverage the vulnerability. In addition, there needs to be an entity actively monitoring a guest\u0027s video frame buffer (typically for display purposes) in order for such a guest to be able to leverage the vulnerability. x86 PV guests, as well as x86 HVM guests using hardware assisted paging (HAP), cannot leverage the vulnerability."
        }
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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-2020-AVI-418

Vulnerability from certfr_avis

Solution

CVE-2020-15565 (GCVE-0-2020-15565)

Vulnerability from cvelistv5

CVE-2020-15563 (GCVE-0-2020-15563)

Vulnerability from cvelistv5

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Sightings

Nomenclature