UBUNTU-CVE-2019-19579

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Source
https://ubuntu.com/security/notices/UBUNTU-CVE-2019-19579
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-19579.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2019-19579
Related
Published
2019-12-04T22:15:00Z
Modified
2019-12-04T22:15:00Z
Severity
  • 6.8 (Medium) CVSS_V3 - CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
[none]
Details

An issue was discovered in Xen through 4.12.x allowing attackers to gain host OS privileges via DMA in a situation where an untrusted domain has access to a physical device (and assignable-add is not used), because of an incomplete fix for CVE-2019-18424. XSA-302 relies on the use of libxl's "assignable-add" feature to prepare devices to be assigned to untrusted guests. Unfortunately, this is not considered a strictly required step for device assignment. The PCI passthrough documentation on the wiki describes alternate ways of preparing devices for assignment, and libvirt uses its own ways as well. Hosts where these "alternate" methods are used will still leave the system in a vulnerable state after the device comes back from a guest. An untrusted domain with access to a physical device can DMA into host memory, leading to privilege escalation. Only systems where guests are given direct access to physical devices capable of DMA (PCI pass-through) are vulnerable. Systems which do not use PCI pass-through are not vulnerable.

References

Affected packages

Ubuntu:Pro:16.04:LTS / xen

Package

Name
xen

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

4.*

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 

{
    "ubuntu_priority": "medium"
}

Ubuntu:Pro:18.04:LTS / xen

Package

Name
xen

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.9.0-0ubuntu3
4.9.0-0ubuntu4
4.9.2-0ubuntu1

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}

Ubuntu:20.04:LTS / xen

Package

Name
xen
Purl
pkg:deb/ubuntu/xen@4.11.3+24-g14b62ab3e5-1ubuntu1?arch=src?distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.11.3+24-g14b62ab3e5-1ubuntu1

Affected versions

4.*

4.9.2-0ubuntu2
4.9.2-0ubuntu6
4.9.2-0ubuntu7

Ecosystem specific 

{
    "availability": "No subscription required",
    "ubuntu_priority": "medium",
    "binaries": [
        {
            "xen-doc": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxengnttab1": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxendevicemodel1-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "xen-hypervisor-4.11-armhf": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "xen-hypervisor-4.9-armhf": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxenevtchn1-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxentoolcore1-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxentoollog1-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "xen-hypervisor-common": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "xen-hypervisor-4.9-arm64": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxenforeignmemory1": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxencall1": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "xen-utils-common-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "xen-utils-4.11-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxenmisc4.11-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "xen-system-arm64": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "xenstore-utils-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxenstore3.0": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "xen-hypervisor-4.11-arm64": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxengnttab1-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxenstore3.0-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "xen-hypervisor-4.9-amd64": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxenforeignmemory1-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxendevicemodel1": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxen-dev": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "xen-system-amd64": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxentoolcore1": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxencall1-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "xenstore-utils": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxenevtchn1": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "xen-utils-common": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "xen-system-armhf": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxentoollog1": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "xen-hypervisor-4.11-amd64": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "xen-utils-4.11": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxenmisc4.11": "4.11.3+24-g14b62ab3e5-1ubuntu1"
        }
    ]
}