Current Description
An issue was discovered in Xen through 4.11.x. ARM never properly implemented grant table v2, either in the hypervisor or in Linux. Unfortunately, an ARM guest can still request v2 grant tables; they will simply not be properly set up, resulting in subsequent grant-related hypercalls hitting BUG() checks. An unprivileged guest can cause a BUG() check in the hypervisor, resulting in a denial-of-service (crash).
Source:
MITRE
Description Last Modified:
08/17/2018
View Analysis Description
Analysis Description
An issue was discovered in Xen through 4.11.x. ARM never properly implemented grant table v2, either in the hypervisor or in Linux. Unfortunately, an ARM guest can still request v2 grant tables; they will simply not be properly set up, resulting in subsequent grant-related hypercalls hitting BUG() checks. An unprivileged guest can cause a BUG() check in the hypervisor, resulting in a denial-of-service (crash).
Source:
MITRE
Description Last Modified:
08/17/2018
Impact
CVSS v3.0 Severity and Metrics:
Base Score:
6.5 MEDIUM
Vector:
AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
(V3 legend)
Impact Score:
4.0
Exploitability Score:
2.0
Attack Vector (AV):
Local
Attack Complexity (AC):
Low
Privileges Required (PR):
Low
User Interaction (UI):
None
Scope (S):
Changed
Confidentiality (C):
None
Integrity (I):
None
Availability (A):
High
CVSS v2.0 Severity and Metrics:
Base Score:
4.9 MEDIUM
Vector:
(AV:L/AC:L/Au:N/C:N/I:N/A:C)
(V2 legend)
Impact Subscore:
6.9
Exploitability Subscore:
3.9
Access Vector (AV):
Local
Access Complexity (AC):
Low
Authentication (AU):
None
Confidentiality (C):
None
Integrity (I):
None
Availability (A):
Complete
Additional Information:
Allows disruption of service
References to Advisories, Solutions, and Tools
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Technical Details
Vulnerability Type
(View All)
- Uncontrolled Resource Consumption ('Resource Exhaustion') (CWE-400)
Change History
3 change records found
- show changes
Reanalysis -
11/1/2018 10:23:41 AM
| Action |
Type |
Old Value |
New Value |
| Removed |
Reference |
https://tools.cisco.com/security/center/viewAlert.x?alertId=58764 [Third Party Advisory] |
|
Initial Analysis -
11/1/2018 10:16:42 AM
| Action |
Type |
Old Value |
New Value |
| Added |
CPE Configuration |
|
OR
*cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:* versions up to (including) 4.11.0 |
| Added |
CVSS V2 |
|
(AV:L/AC:L/Au:N/C:N/I:N/A:C) |
| Added |
CVSS V3 |
|
AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H |
| Added |
CWE |
|
CWE-400 |
| Added |
Reference |
|
https://tools.cisco.com/security/center/viewAlert.x?alertId=58764 [Third Party Advisory] |
| Changed |
Reference Type |
http://xenbits.xen.org/xsa/advisory-268.html No Types Assigned |
http://xenbits.xen.org/xsa/advisory-268.html Patch, Vendor Advisory |
| Changed |
Reference Type |
https://security.gentoo.org/glsa/201810-06 No Types Assigned |
https://security.gentoo.org/glsa/201810-06 Third Party Advisory |
CVE Modified by MITRE -
10/31/2018 6:31:07 AM
| Action |
Type |
Old Value |
New Value |
| Added |
Reference |
|
https://security.gentoo.org/glsa/201810-06 [No Types Assigned] |