CVE - CVE-2019-18424

CVE-ID
CVE-2019-18424	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. This occurs because passed through PCI devices may corrupt host memory after deassignment. When a PCI device is assigned to an untrusted domain, it is possible for that domain to program the device to DMA to an arbitrary address. The IOMMU is used to protect the host from malicious DMA by making sure that the device addresses can only target memory assigned to the guest. However, when the guest domain is torn down, or the device is deassigned, the device is assigned back to dom0, thus allowing any in-flight DMA to potentially target critical host data. 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 DEBIAN:DSA-4602 URL:https://www.debian.org/security/2020/dsa-4602 FEDORA:FEDORA-2019-376ec5c107 URL:https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/I5WWPW4BSZDDW7VHU427XTVXV7ROOFFW/ FEDORA:FEDORA-2019-865bb16900 URL:https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2BQKX7M2RHCWDBKNPX4KEBI3MJIH6AYZ/ FEDORA:FEDORA-2019-cbb732f760 URL:https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IZYATWNUGHRBG6I3TC24YHP5Y3J7I6KH/ GENTOO:GLSA-202003-56 URL:https://security.gentoo.org/glsa/202003-56 MISC:http://xenbits.xen.org/xsa/advisory-302.html MLIST:[oss-security] 20191031 Xen Security Advisory 302 v5 (CVE-2019-18424) - passed through PCI devices may corrupt host memory after deassignment URL:http://www.openwall.com/lists/oss-security/2019/10/31/6 SUSE:openSUSE-SU-2019:2506 URL:http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00037.html
Assigning CNA
MITRE Corporation
Date Record Created
20191024	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 (20191024)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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