CVE - CVE-2019-19579

CVE-ID
CVE-2019-19579	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
BUGTRAQ:20200114 [SECURITY] [DSA 4602-1] xen security update URL:https://seclists.org/bugtraq/2020/Jan/21 CONFIRM:http://xenbits.xen.org/xsa/advisory-306.html DEBIAN:DSA-4602 URL:https://www.debian.org/security/2020/dsa-4602 FEDORA:FEDORA-2019-3d7105bd2a URL:https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RJYT5FNGM7JSVHHW6B22TSAATBOAPFPD/ MISC:https://www.openwall.com/lists/oss-security/2019/11/26/2 MISC:https://xenbits.xen.org/xsa/advisory-306.html MLIST:[oss-security] 20191205 Xen Security Advisory 306 v3 (CVE-2019-19579) - Device quarantine for alternate pci assignment methods URL:http://www.openwall.com/lists/oss-security/2019/12/05/7 SUSE:openSUSE-SU-2020:0011 URL:http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00011.html
Assigning CNA
MITRE Corporation
Date Record Created
20191204	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20191204)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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