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CVE
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CVE-2019-18424Date: (C)2019-11-04   (M)2024-02-22


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.

CVSS Score and Metrics +CVSS Score and Metrics -

CVSS V3 Severity:CVSS V2 Severity:
CVSS Score : 6.8CVSS Score : 6.9
Exploit Score: 0.9Exploit Score: 3.4
Impact Score: 5.9Impact Score: 10.0
 
CVSS V3 Metrics:CVSS V2 Metrics:
Attack Vector: PHYSICALAccess Vector: LOCAL
Attack Complexity: LOWAccess Complexity: MEDIUM
Privileges Required: NONEAuthentication: NONE
User Interaction: NONEConfidentiality: COMPLETE
Scope: UNCHANGEDIntegrity: COMPLETE
Confidentiality: HIGHAvailability: COMPLETE
Integrity: HIGH 
Availability: HIGH 
  
Reference:
https://seclists.org/bugtraq/2020/Jan/21
DSA-4602
FEDORA-2019-376ec5c107
FEDORA-2019-865bb16900
FEDORA-2019-cbb732f760
GLSA-202003-56
http://www.openwall.com/lists/oss-security/2019/10/31/6
http://xenbits.xen.org/xsa/advisory-302.html
openSUSE-SU-2019:2506

CPE    1
cpe:/o:debian:debian_linux:9.0
CWE    1
CWE-78
OVAL    13
oval:org.secpod.oval:def:89003055
oval:org.secpod.oval:def:117447
oval:org.secpod.oval:def:89003200
oval:org.secpod.oval:def:89050660
...

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