CVE-2019-19579

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Summary

CVECVE-2019-19579
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2019-12-04 22:15:00 UTC
Updated2023-11-07 03:07:00 UTC
DescriptionAn 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.

Risk And Classification

Problem Types: CWE-20

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Fedoraproject Fedora 30 All All All
Operating System Fedoraproject Fedora 30 All All All
Operating System Xen Xen All All All All

References

ReferenceSourceLinkTags
Debian -- Security Information -- DSA-4602-1 xen DEBIAN www.debian.org
XSA-306 - Xen Security Advisories CONFIRM xenbits.xen.org Vendor Advisory
[SECURITY] Fedora 30 Update: xen-4.11.2-4.fc30 - package-announce - Fedora Mailing-Lists FEDORA lists.fedoraproject.org Third Party Advisory
oss-security - Xen Security Advisory 306 v2 - Device quarantine for alternate pci assignment methods MISC www.openwall.com Mailing List, Third Party Advisory
XSA-306 - Xen Security Advisories MISC xenbits.xen.org Vendor Advisory
[security-announce] openSUSE-SU-2020:0011-1: important: Security update SUSE lists.opensuse.org
oss-security - Xen Security Advisory 306 v3 (CVE-2019-19579) - Device quarantine for alternate pci assignment methods MLIST www.openwall.com Mailing List, Third Party Advisory
[SECURITY] Fedora 30 Update: xen-4.11.2-4.fc30 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
Bugtraq: [SECURITY] [DSA 4602-1] xen security update BUGTRAQ seclists.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 500754 Alpine Linux Security Update for xen
  • 504531 Alpine Linux Security Update for xen
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