FKIE_CVE-2019-18420

Vulnerability from fkie_nvd - Published: 2019-10-31 14:15 - Updated: 2024-11-21 04:33
Severity ?
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to cause a denial of service via a VCPUOP_initialise hypercall. hypercall_create_continuation() is a variadic function which uses a printf-like format string to interpret its parameters. Error handling for a bad format character was done using BUG(), which crashes Xen. One path, via the VCPUOP_initialise hypercall, has a bad format character. The BUG() can be hit if VCPUOP_initialise executes for a sufficiently long period of time for a continuation to be created. Malicious guests may cause a hypervisor crash, resulting in a Denial of Service (DoS). Xen versions 4.6 and newer are vulnerable. Xen versions 4.5 and earlier are not vulnerable. Only x86 PV guests can exploit the vulnerability. HVM and PVH guests, and guests on ARM systems, cannot exploit the vulnerability.
References
cve@mitre.orghttp://lists.opensuse.org/opensuse-security-announce/2019-11/msg00037.htmlBroken Link, Mailing List, Third Party Advisory
cve@mitre.orghttp://www.openwall.com/lists/oss-security/2019/10/31/1Mailing List, Patch, Third Party Advisory
cve@mitre.orghttp://xenbits.xen.org/xsa/advisory-296.htmlPatch, Vendor Advisory
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2BQKX7M2RHCWDBKNPX4KEBI3MJIH6AYZ/
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/I5WWPW4BSZDDW7VHU427XTVXV7ROOFFW/
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IZYATWNUGHRBG6I3TC24YHP5Y3J7I6KH/
cve@mitre.orghttps://seclists.org/bugtraq/2020/Jan/21Mailing List, Third Party Advisory
cve@mitre.orghttps://security.gentoo.org/glsa/202003-56Third Party Advisory
cve@mitre.orghttps://www.debian.org/security/2020/dsa-4602Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00037.htmlBroken Link, Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2019/10/31/1Mailing List, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://xenbits.xen.org/xsa/advisory-296.htmlPatch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2BQKX7M2RHCWDBKNPX4KEBI3MJIH6AYZ/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/I5WWPW4BSZDDW7VHU427XTVXV7ROOFFW/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IZYATWNUGHRBG6I3TC24YHP5Y3J7I6KH/
af854a3a-2127-422b-91ae-364da2661108https://seclists.org/bugtraq/2020/Jan/21Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202003-56Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.debian.org/security/2020/dsa-4602Third Party Advisory
Impacted products
Vendor Product Version
xen xen *
debian debian_linux 9.0
debian debian_linux 10.0
fedoraproject fedora 29
fedoraproject fedora 30
fedoraproject fedora 31
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:xen:xen:*:*:*:*:*:*:x86:*",
              "matchCriteriaId": "18F9F58D-58A0-4356-AB70-E5ACF913BFCA",
              "versionEndIncluding": "4.12.1",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    },
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "DEECE5FC-CACF-4496-A3E7-164736409252",
              "vulnerable": true
            },
            {
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              "matchCriteriaId": "07B237A9-69A3-4A9C-9DA0-4E06BD37AE73",
              "vulnerable": true
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              "matchCriteriaId": "D100F7CE-FC64-4CC6-852A-6136D72DA419",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*",
              "matchCriteriaId": "97A4B8DF-58DA-4AB6-A1F9-331B36409BA3",
              "vulnerable": true
            },
            {
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              "matchCriteriaId": "80F0FA5D-8D3B-4C0E-81E2-87998286AF33",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to cause a denial of service via a VCPUOP_initialise hypercall. hypercall_create_continuation() is a variadic function which uses a printf-like format string to interpret its parameters. Error handling for a bad format character was done using BUG(), which crashes Xen. One path, via the VCPUOP_initialise hypercall, has a bad format character. The BUG() can be hit if VCPUOP_initialise executes for a sufficiently long period of time for a continuation to be created. Malicious guests may cause a hypervisor crash, resulting in a Denial of Service (DoS). Xen versions 4.6 and newer are vulnerable. Xen versions 4.5 and earlier are not vulnerable. Only x86 PV guests can exploit the vulnerability. HVM and PVH guests, and guests on ARM systems, cannot exploit the vulnerability."
    },
    {
      "lang": "es",
      "value": "Se detect\u00f3 un problema en Xen versiones hasta 4.12.x, permitiendo a usuarios del sistema operativo invitado PV de x86 causar una denegaci\u00f3n de servicio por medio de una hipercall de VCPUOP_initialise. hypercall_create_continuation() es una funci\u00f3n variadic que utiliza una cadena de formato tipo printf para interpretar sus par\u00e1metros. El manejo de errores para un car\u00e1cter de formato incorrecto fue realizado utilizando BUG(), que bloquea a Xen. Una ruta, por medio de una hypercall VCPUOP_initialise, tiene un car\u00e1cter de formato incorrecto. El BUG() puede ser golpeado si VCPUOP_initialise es ejecutado durante un per\u00edodo de tiempo suficientemente largo para que una continuaci\u00f3n sea creada. Los invitados maliciosos pueden causar un bloqueo del hipervisor, resultando en una Denegaci\u00f3n de Servicio (DoS). Xen versiones 4.6 y m\u00e1s recientes son vulnerables. Las versiones de Xen 4.5 y anteriores no son vulnerables. Solo los invitados de PV x86 pueden explotar la vulnerabilidad. Los invitados de HVM y PVH, e invitados en sistemas ARM, no pueden explotar la vulnerabilidad."
    }
  ],
  "id": "CVE-2019-18420",
  "lastModified": "2024-11-21T04:33:13.697",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "MEDIUM",
          "accessVector": "NETWORK",
          "authentication": "SINGLE",
          "availabilityImpact": "COMPLETE",
          "baseScore": 6.3,
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:M/Au:S/C:N/I:N/A:C",
          "version": "2.0"
        },
        "exploitabilityScore": 6.8,
        "impactScore": 6.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 6.5,
          "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:H",
          "version": "3.1"
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        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
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  },
  "published": "2019-10-31T14:15:10.650",
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    {
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      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2BQKX7M2RHCWDBKNPX4KEBI3MJIH6AYZ/"
    },
    {
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      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/I5WWPW4BSZDDW7VHU427XTVXV7ROOFFW/"
    },
    {
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    {
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  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
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          "value": "CWE-134"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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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.



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