CVE-2019-18422 Detail
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.
Source:
MITRE
View Analysis Description
Analysis 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.
Source:
MITRE
Severity
CVSS 3.x Severity and Metrics:
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0 Severity and Metrics:
Vector: (AV:N/AC:M/Au:S/C:C/I:C/A:C)
References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID |
CWE Name |
Source |
| CWE-732 |
Incorrect Permission Assignment for Critical Resource |
NIST
|
Change History
2 change records found
- show changes
Initial Analysis -
11/6/2019 1:35:13 PM
| Action |
Type |
Old Value |
New Value |
| Added |
CPE Configuration |
|
OR
*cpe:2.3:o:xen:xen:*:*:*:*:*:*:arm:* versions up to (including) 4.12.1 |
| Added |
CVSS V2 |
|
NIST (AV:N/AC:M/Au:S/C:C/I:C/A:C) |
| Added |
CVSS V3.1 |
|
NIST AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| Added |
CWE |
|
NIST CWE-732 |
| Changed |
Reference Type |
http://www.openwall.com/lists/oss-security/2019/10/31/5 No Types Assigned |
http://www.openwall.com/lists/oss-security/2019/10/31/5 Mailing List, Patch, Third Party Advisory |
| Changed |
Reference Type |
http://xenbits.xen.org/xsa/advisory-303.html No Types Assigned |
http://xenbits.xen.org/xsa/advisory-303.html Patch, Vendor Advisory |
CVE Modified by MITRE -
10/31/2019 11:15:11 AM
| Action |
Type |
Old Value |
New Value |
| Added |
Reference |
|
http://www.openwall.com/lists/oss-security/2019/10/31/5 [No Types Assigned] |
Quick Info
CVE Dictionary Entry:
CVE-2019-18422
NVD Published Date:
10/31/2019
NVD Last Modified:
11/06/2019
|