cve-2023-46842
Vulnerability from cvelistv5
Published
2024-05-16 13:39
Modified
2024-08-02 20:53
Severity ?
EPSS score ?
Summary
x86 HVM hypercalls may trigger Xen bug check
References
{
"containers": {
"adp": [
{
"metrics": [
{
"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"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2024-06-04T17:22:13.355Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
},
{
"providerMetadata": {
"dateUpdated": "2024-08-02T20:53:21.979Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"tags": [
"x_transferred"
],
"url": "https://xenbits.xenproject.org/xsa/advisory-454.html"
}
],
"title": "CVE Program Container"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unknown",
"product": "Xen",
"vendor": "Xen",
"versions": [
{
"status": "unknown",
"version": "consult Xen advisory XSA-454"
}
]
}
],
"configurations": [
{
"lang": "en",
"value": "All Xen versions from at least 3.2 onwards are vulnerable. Earlier\nversions have not been inspected.\n\nOnly x86 systems are vulnerable. Arm systems are not vulnerable.\n\nOnly HVM or PVH guests can leverage the vulnerability. PV guests cannot\nleverage the vulnerability.\n"
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "This issue was discovered by Manuel Andreas of Technical University of\nMunich.\n"
}
],
"datePublic": "2024-04-09T11:50:00Z",
"descriptions": [
{
"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"
}
],
"impacts": [
{
"descriptions": [
{
"lang": "en",
"value": "A HVM or PVH guest can cause a hypervisor crash, causing a Denial of\nService (DoS) of the entire host.\n"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2024-05-16T13:39:26.183Z",
"orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"shortName": "XEN"
},
"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": "2024-08-02T20:53:21.979Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2023-46842\",\"sourceIdentifier\":\"security@xen.org\",\"published\":\"2024-05-16T14:15:08.317\",\"lastModified\":\"2024-05-16T15:44:44.683\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"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\"}],\"metrics\":{},\"references\":[{\"url\":\"https://xenbits.xenproject.org/xsa/advisory-454.html\",\"source\":\"security@xen.org\"}]}}"
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
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- Confirmed: The vulnerability is confirmed from an analyst perspective.
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- 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.