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Vulnerability Details : CVE-2019-18424

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.
Publish Date : 2019-10-31 Last Update Date : 2019-11-14
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- CVSS Scores & Vulnerability Types

CVSS Score
6.9
Confidentiality Impact Complete (There is total information disclosure, resulting in all system files being revealed.)
Integrity Impact Complete (There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the entire system being compromised.)
Availability Impact Complete (There is a total shutdown of the affected resource. The attacker can render the resource completely unavailable.)
Access Complexity Medium (The access conditions are somewhat specialized. Some preconditions must be satistified to exploit)
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Gain privileges
CWE ID 78

- Products Affected By CVE-2019-18424

# Product Type Vendor Product Version Update Edition Language
1 OS XEN XEN * * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
XEN XEN 1

- References For CVE-2019-18424

https://seclists.org/bugtraq/2020/Jan/21
BUGTRAQ 20200114 [SECURITY] [DSA 4602-1] xen security update
https://www.debian.org/security/2020/dsa-4602
DEBIAN DSA-4602
https://lists.fedoraproject.org/archives/list/[email protected]/message/IZYATWNUGHRBG6I3TC24YHP5Y3J7I6KH/
FEDORA FEDORA-2019-cbb732f760
https://lists.fedoraproject.org/archives/list/[email protected]/message/I5WWPW4BSZDDW7VHU427XTVXV7ROOFFW/
FEDORA FEDORA-2019-376ec5c107
https://lists.fedoraproject.org/archives/list/[email protected]/message/2BQKX7M2RHCWDBKNPX4KEBI3MJIH6AYZ/
FEDORA FEDORA-2019-865bb16900
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00037.html
SUSE openSUSE-SU-2019:2506
http://www.openwall.com/lists/oss-security/2019/10/31/6
MLIST [oss-security] 20191031 Xen Security Advisory 302 v5 (CVE-2019-18424) - passed through PCI devices may corrupt host memory after deassignment
http://xenbits.xen.org/xsa/advisory-302.html
https://security.gentoo.org/glsa/202003-56
GENTOO GLSA-202003-56

- Metasploit Modules Related To CVE-2019-18424

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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