CVE-2019-18422

Current Description

An issue was discovered in Xen through 4.12.x allowing ARM guest OS users to cause a denial of service or gain privileges by leveraging the erroneous enabling of interrupts. Interrupts are unconditionally unmasked in exception handlers. When an exception occurs on an ARM system which is handled without changing processor level, some interrupts are unconditionally enabled during exception entry. So exceptions which occur when interrupts are masked will effectively unmask the interrupts. A malicious guest might contrive to arrange for critical Xen code to run with interrupts erroneously enabled. This could lead to data corruption, denial of service, or possibly even privilege escalation. However a precise attack technique has not been identified.

Basic Data

Published	October 31, 2019
Last Modified	November 17, 2019
Assigner	cve@mitre.org
Data Type	CVE
Data Format	MITRE
Data Version	4.0
Problem Type	CWE-732
CVE Data Version	4.0

Base Metric V2

CVSS 2 - Version	2.0
CVSS 2 - Vector String	AV:N/AC:M/Au:S/C:C/I:C/A:C
CVSS 2 - Access Vector	NETWORK
CVSS 2 - Access Complexity	MEDIUM
CVSS 2 - Authentication	SINGLE
CVSS 2 - Confidentiality Impact	COMPLETE
CVSS 2 - Availability Impact	COMPLETE
CVSS 2 - Base Score	8.5
Severity	HIGH
Exploitability Score	6.8
Impact Score	10.0
Obtain All Privilege	false
Obtain User Privilege	false
Obtain Other Privilege	false

Base Metric V3

No data provided.

Configurations

Vulnerable Software List

Vendor	Product	Versions
Xen	Xen	*

References