ubuntu-cve-2020-29481
Vulnerability from osv_ubuntu
Published
2020-12-15 18:15
Modified
2026-04-22 07:39
Summary
Details
An issue was discovered in Xen through 4.14.x. Access rights of Xenstore nodes are per domid. Unfortunately, existing granted access rights are not removed when a domain is being destroyed. This means that a new domain created with the same domid will inherit the access rights to Xenstore nodes from the previous domain(s) with the same domid. Because all Xenstore entries of a guest below /local/domain/ are being deleted by Xen tools when a guest is destroyed, only Xenstore entries of other guests still running are affected. For example, a newly created guest domain might be able to read sensitive information that had belonged to a previously existing guest domain. Both Xenstore implementations (C and Ocaml) are vulnerable.
Severity
8.8 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libxen-4.6",
"binary_version": "4.6.5-0ubuntu1.4"
},
{
"binary_name": "libxenstore3.0",
"binary_version": "4.6.5-0ubuntu1.4"
},
{
"binary_name": "xen-hypervisor-4.4-amd64",
"binary_version": "4.6.5-0ubuntu1.4"
},
{
"binary_name": "xen-hypervisor-4.4-arm64",
"binary_version": "4.6.5-0ubuntu1.4"
},
{
"binary_name": "xen-hypervisor-4.4-armhf",
"binary_version": "4.6.5-0ubuntu1.4"
},
{
"binary_name": "xen-hypervisor-4.5-amd64",
"binary_version": "4.6.5-0ubuntu1.4"
},
{
"binary_name": "xen-hypervisor-4.5-arm64",
"binary_version": "4.6.5-0ubuntu1.4"
},
{
"binary_name": "xen-hypervisor-4.5-armhf",
"binary_version": "4.6.5-0ubuntu1.4"
},
{
"binary_name": "xen-hypervisor-4.6-amd64",
"binary_version": "4.6.5-0ubuntu1.4"
},
{
"binary_name": "xen-hypervisor-4.6-arm64",
"binary_version": "4.6.5-0ubuntu1.4"
},
{
"binary_name": "xen-hypervisor-4.6-armhf",
"binary_version": "4.6.5-0ubuntu1.4"
},
{
"binary_name": "xen-system-amd64",
"binary_version": "4.6.5-0ubuntu1.4"
},
{
"binary_name": "xen-system-arm64",
"binary_version": "4.6.5-0ubuntu1.4"
},
{
"binary_name": "xen-system-armhf",
"binary_version": "4.6.5-0ubuntu1.4"
},
{
"binary_name": "xen-utils-4.6",
"binary_version": "4.6.5-0ubuntu1.4"
},
{
"binary_name": "xen-utils-common",
"binary_version": "4.6.5-0ubuntu1.4"
},
{
"binary_name": "xenstore-utils",
"binary_version": "4.6.5-0ubuntu1.4"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "xen",
"purl": "pkg:deb/ubuntu/xen@4.6.5-0ubuntu1.4?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.5.1-0ubuntu1",
"4.5.1-0ubuntu2",
"4.6.0-1ubuntu1",
"4.6.0-1ubuntu2",
"4.6.0-1ubuntu4",
"4.6.0-1ubuntu4.1",
"4.6.0-1ubuntu4.2",
"4.6.0-1ubuntu4.3",
"4.6.5-0ubuntu1",
"4.6.5-0ubuntu1.1",
"4.6.5-0ubuntu1.2",
"4.6.5-0ubuntu1.4"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libxen-4.9",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "libxenstore3.0",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xen-hypervisor-4.6-amd64",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xen-hypervisor-4.6-arm64",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xen-hypervisor-4.6-armhf",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xen-hypervisor-4.7-amd64",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xen-hypervisor-4.7-arm64",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xen-hypervisor-4.7-armhf",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xen-hypervisor-4.8-amd64",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xen-hypervisor-4.8-arm64",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xen-hypervisor-4.8-armhf",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xen-hypervisor-4.9-amd64",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xen-hypervisor-4.9-arm64",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xen-hypervisor-4.9-armhf",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xen-system-amd64",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xen-system-arm64",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xen-system-armhf",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xen-utils-4.9",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xen-utils-common",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xenstore-utils",
"binary_version": "4.9.2-0ubuntu1"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "xen",
"purl": "pkg:deb/ubuntu/xen@4.9.2-0ubuntu1?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.9.0-0ubuntu3",
"4.9.0-0ubuntu4",
"4.9.2-0ubuntu1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libxencall1",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "libxendevicemodel1",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "libxenevtchn1",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "libxenforeignmemory1",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "libxengnttab1",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "libxenmisc4.11",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "libxenstore3.0",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "libxentoolcore1",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "libxentoollog1",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "xen-hypervisor-4.11-amd64",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "xen-hypervisor-4.11-arm64",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "xen-hypervisor-4.11-armhf",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "xen-hypervisor-4.9-amd64",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "xen-hypervisor-4.9-arm64",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "xen-hypervisor-4.9-armhf",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "xen-hypervisor-common",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "xen-system-amd64",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "xen-system-arm64",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "xen-system-armhf",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "xen-utils-4.11",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "xen-utils-common",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "xenstore-utils",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "xen",
"purl": "pkg:deb/ubuntu/xen@4.11.3+24-g14b62ab3e5-1ubuntu2.3?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.9.2-0ubuntu2",
"4.9.2-0ubuntu6",
"4.9.2-0ubuntu7",
"4.11.3+24-g14b62ab3e5-1ubuntu1",
"4.11.3+24-g14b62ab3e5-1ubuntu2",
"4.11.3+24-g14b62ab3e5-1ubuntu2.2",
"4.11.3+24-g14b62ab3e5-1ubuntu2.3"
]
}
],
"aliases": [],
"details": "An issue was discovered in Xen through 4.14.x. Access rights of Xenstore nodes are per domid. Unfortunately, existing granted access rights are not removed when a domain is being destroyed. This means that a new domain created with the same domid will inherit the access rights to Xenstore nodes from the previous domain(s) with the same domid. Because all Xenstore entries of a guest below /local/domain/\u003cdomid\u003e are being deleted by Xen tools when a guest is destroyed, only Xenstore entries of other guests still running are affected. For example, a newly created guest domain might be able to read sensitive information that had belonged to a previously existing guest domain. Both Xenstore implementations (C and Ocaml) are vulnerable.",
"id": "UBUNTU-CVE-2020-29481",
"modified": "2026-04-22T07:39:39Z",
"published": "2020-12-15T18:15:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2020-29481"
},
{
"type": "REPORT",
"url": "https://xenbits.xen.org/xsa/advisory-322.html"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-29481"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2020-29481"
]
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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