Modified
This vulnerability has been modified since it was last analyzed by the NVD. It is awaiting reanalysis which may result in further changes to the information provided.
Current Description
An issue was discovered in Xen through 4.11.x. The logic in oxenstored for handling writes depended on the order of evaluation of expressions making up a tuple. As indicated in section 7.7.3 "Operations on data structures" of the OCaml manual, the order of evaluation of subexpressions is not specified. In practice, different implementations behave differently. Thus, oxenstored may not enforce the configured quota-maxentity. This allows a malicious or buggy guest to write as many xenstore entries as it wishes, causing unbounded memory usage in oxenstored. This can lead to a system-wide DoS.
Source:
MITRE
View Analysis Description
Analysis Description
An issue was discovered in Xen through 4.11.x. The logic in oxenstored for handling writes depended on the order of evaluation of expressions making up a tuple. As indicated in section 7.7.3 "Operations on data structures" of the OCaml manual, the order of evaluation of subexpressions is not specified. In practice, different implementations behave differently. Thus, oxenstored may not enforce the configured quota-maxentity. This allows a malicious or buggy guest to write as many xenstore entries as it wishes, causing unbounded memory usage in oxenstored. This can lead to a system-wide DoS.
Source:
MITRE
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
CVE Modified by MITRE -
11/13/2018 6:29:29 AM
| Action |
Type |
Old Value |
New Value |
| Added |
Reference |
|
https://lists.debian.org/debian-lts-announce/2018/11/msg00013.html [No Types Assigned] |
Initial Analysis -
11/1/2018 10:17:02 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 |
| Changed |
Reference Type |
http://xenbits.xen.org/xsa/advisory-272.html No Types Assigned |
http://xenbits.xen.org/xsa/advisory-272.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 6:31:08 AM
| Action |
Type |
Old Value |
New Value |
| Added |
Reference |
|
https://security.gentoo.org/glsa/201810-06 [No Types Assigned] |