cve-2023-46842
Vulnerability from cvelistv5
Published
2024-05-16 13:39
Modified
2024-12-04 16:57
Severity ?
6.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
EPSS score ?
0.10% (0.24414)
Summary
Unlike 32-bit PV guests, HVM guests may switch freely between 64-bit and other modes. This in particular means that they may set registers used to pass 32-bit-mode hypercall arguments to values outside of the range 32-bit code would be able to set them to. When processing of hypercalls takes a considerable amount of time, the hypervisor may choose to invoke a hypercall continuation. Doing so involves putting (perhaps updated) hypercall arguments in respective registers. For guests not running in 64-bit mode this further involves a certain amount of translation of the values. Unfortunately internal sanity checking of these translated values assumes high halves of registers to always be clear when invoking a hypercall. When this is found not to be the case, it triggers a consistency check in the hypervisor and causes a crash.
References
security@xen.orghttps://xenbits.xenproject.org/xsa/advisory-454.html
af854a3a-2127-422b-91ae-364da2661108https://xenbits.xenproject.org/xsa/advisory-454.html
Impacted products
Vendor Product Version
Xen Xen Create a notification for this product.
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{
   containers: {
      adp: [
         {
            metrics: [
               {
                  cvssV3_1: {
                     attackComplexity: "LOW",
                     attackVector: "LOCAL",
                     availabilityImpact: "HIGH",
                     baseScore: 6.5,
                     baseSeverity: "MEDIUM",
                     confidentialityImpact: "NONE",
                     integrityImpact: "NONE",
                     privilegesRequired: "LOW",
                     scope: "CHANGED",
                     userInteraction: "NONE",
                     vectorString: "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
                     version: "3.1",
                  },
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                  other: {
                     content: {
                        id: "CVE-2023-46842",
                        options: [
                           {
                              Exploitation: "none",
                           },
                           {
                              Automatable: "no",
                           },
                           {
                              "Technical Impact": "partial",
                           },
                        ],
                        role: "CISA Coordinator",
                        timestamp: "2024-05-24T18:23:20.820059Z",
                        version: "2.0.3",
                     },
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            problemTypes: [
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                  descriptions: [
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                        cweId: "CWE-843",
                        description: "CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')",
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                        type: "CWE",
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            providerMetadata: {
               dateUpdated: "2024-12-04T16:57:56.599Z",
               orgId: "134c704f-9b21-4f2e-91b3-4a467353bcc0",
               shortName: "CISA-ADP",
            },
            title: "CISA ADP Vulnrichment",
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               dateUpdated: "2024-08-02T20:53:21.979Z",
               orgId: "af854a3a-2127-422b-91ae-364da2661108",
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                  tags: [
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                  url: "https://xenbits.xenproject.org/xsa/advisory-454.html",
               },
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            title: "CVE Program Container",
         },
      ],
      cna: {
         affected: [
            {
               defaultStatus: "unknown",
               product: "Xen",
               vendor: "Xen",
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                     version: "consult Xen advisory XSA-454",
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         configurations: [
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            },
         ],
         credits: [
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               type: "finder",
               value: "This issue was discovered by Manuel Andreas of Technical University of\nMunich.\n",
            },
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         datePublic: "2024-04-09T11:50:00Z",
         descriptions: [
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               lang: "en",
               value: "Unlike 32-bit PV guests, HVM guests may switch freely between 64-bit and\nother modes.  This in particular means that they may set registers used\nto pass 32-bit-mode hypercall arguments to values outside of the range\n32-bit code would be able to set them to.\n\nWhen processing of hypercalls takes a considerable amount of time,\nthe hypervisor may choose to invoke a hypercall continuation.  Doing so\ninvolves putting (perhaps updated) hypercall arguments in respective\nregisters.  For guests not running in 64-bit mode this further involves\na certain amount of translation of the values.\n\nUnfortunately internal sanity checking of these translated values\nassumes high halves of registers to always be clear when invoking a\nhypercall.  When this is found not to be the case, it triggers a\nconsistency check in the hypervisor and causes a crash.\n",
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            orgId: "23aa2041-22e1-471f-9209-9b7396fa234f",
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         },
         references: [
            {
               url: "https://xenbits.xenproject.org/xsa/advisory-454.html",
            },
         ],
         title: "x86 HVM hypercalls may trigger Xen bug check",
         workarounds: [
            {
               lang: "en",
               value: "Not using HVM / PVH guests will avoid the vulnerability.\n",
            },
         ],
      },
   },
   cveMetadata: {
      assignerOrgId: "23aa2041-22e1-471f-9209-9b7396fa234f",
      assignerShortName: "XEN",
      cveId: "CVE-2023-46842",
      datePublished: "2024-05-16T13:39:26.183Z",
      dateReserved: "2023-10-27T07:55:35.333Z",
      dateUpdated: "2024-12-04T16:57:56.599Z",
      state: "PUBLISHED",
   },
   dataType: "CVE_RECORD",
   dataVersion: "5.1",
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         id: "CVE-2023-46842",
         lastModified: "2024-12-04T17:15:11.343",
         metrics: "{\"cvssMetricV31\": [{\"source\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"type\": \"Secondary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H\", \"baseScore\": 6.5, \"baseSeverity\": \"MEDIUM\", \"attackVector\": \"LOCAL\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"LOW\", \"userInteraction\": \"NONE\", \"scope\": \"CHANGED\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 2.0, \"impactScore\": 4.0}]}",
         published: "2024-05-16T14:15:08.317",
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         sourceIdentifier: "security@xen.org",
         vulnStatus: "Awaiting Analysis",
         weaknesses: "[{\"source\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"type\": \"Secondary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-843\"}]}]",
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      vulnrichment: {
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}


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