CVE-2018-15468 Detail
Current Description
An issue was discovered in Xen through 4.11.x. The DEBUGCTL MSR contains several debugging features, some of which virtualise cleanly, but some do not. In particular, Branch Trace Store is not virtualised by the processor, and software has to be careful to configure it suitably not to lock up the core. As a result, it must only be available to fully trusted guests. Unfortunately, in the case that vPMU is disabled, all value checking was skipped, allowing the guest to choose any MSR_DEBUGCTL setting it likes. A malicious or buggy guest administrator (on Intel x86 HVM or PVH) can lock up the entire host, causing a Denial of Service.
Source:
MITRE
Description Last Modified:
08/17/2018
View Analysis Description
Analysis Description
An issue was discovered in Xen through 4.11.x. The DEBUGCTL MSR contains several debugging features, some of which virtualise cleanly, but some do not. In particular, Branch Trace Store is not virtualised by the processor, and software has to be careful to configure it suitably not to lock up the core. As a result, it must only be available to fully trusted guests. Unfortunately, in the case that vPMU is disabled, all value checking was skipped, allowing the guest to choose any MSR_DEBUGCTL setting it likes. A malicious or buggy guest administrator (on Intel x86 HVM or PVH) can lock up the entire host, causing a Denial of Service.
Source:
MITRE
Description Last Modified:
08/17/2018
Impact
CVSS v3.0 Severity and Metrics:
Base Score:
6.0 MEDIUM
Vector:
AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H
(V3 legend)
Impact Score:
4.0
Exploitability Score:
1.5
Attack Vector (AV):
Local
Attack Complexity (AC):
Low
Privileges Required (PR):
High
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)
- Permissions, Privileges, and Access Control (CWE-264)
Change History
2 change records found
- show changes
Initial Analysis -
11/1/2018 10:21:23 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:H/UI:N/S:C/C:N/I:N/A:H |
| Added |
CWE |
|
CWE-264 |
| Changed |
Reference Type |
http://xenbits.xen.org/xsa/advisory-269.html No Types Assigned |
http://xenbits.xen.org/xsa/advisory-269.html 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] |
Quick Info
CVE Dictionary Entry:
CVE-2018-15468
NVD Published Date:
08/17/2018
NVD Last Modified:
11/01/2018
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