Executive Summary
Informations | |||
---|---|---|---|
Name | CVE-2020-11739 | First vendor Publication | 2020-04-14 |
Vendor | Cve | Last vendor Modification | 2023-11-07 |
Security-Database Scoring CVSS v3
Cvss vector : CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H | |||
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Overall CVSS Score | 7.8 | ||
Base Score | 7.8 | Environmental Score | 7.8 |
impact SubScore | 6 | Temporal Score | 7.8 |
Exploitabality Sub Score | 1.1 | ||
Attack Vector | Local | Attack Complexity | High |
Privileges Required | Low | User Interaction | None |
Scope | Changed | Confidentiality Impact | High |
Integrity Impact | High | Availability Impact | High |
Calculate full CVSS 3.0 Vectors scores |
Security-Database Scoring CVSS v2
Cvss vector : (AV:L/AC:M/Au:N/C:C/I:C/A:C) | |||
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Cvss Base Score | 6.9 | Attack Range | Local |
Cvss Impact Score | 10 | Attack Complexity | Medium |
Cvss Expoit Score | 3.4 | Authentication | None Required |
Calculate full CVSS 2.0 Vectors scores |
Detail
An issue was discovered in Xen through 4.13.x, allowing guest OS users to cause a denial of service or possibly gain privileges because of missing memory barriers in read-write unlock paths. The read-write unlock paths don't contain a memory barrier. On Arm, this means a processor is allowed to re-order the memory access with the preceding ones. In other words, the unlock may be seen by another processor before all the memory accesses within the "critical" section. As a consequence, it may be possible to have a writer executing a critical section at the same time as readers or another writer. In other words, many of the assumptions (e.g., a variable cannot be modified after a check) in the critical sections are not safe anymore. The read-write locks are used in hypercalls (such as grant-table ones), so a malicious guest could exploit the race. For instance, there is a small window where Xen can leak memory if XENMAPSPACE_grant_table is used concurrently. A malicious guest may be able to leak memory, or cause a hypervisor crash resulting in a Denial of Service (DoS). Information leak and privilege escalation cannot be excluded. |
Original Source
Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-11739 |
CWE : Common Weakness Enumeration
% | Id | Name |
---|---|---|
100 % | CWE-362 | Race Condition |
CPE : Common Platform Enumeration
Sources (Detail)
Alert History
Date | Informations |
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2023-11-07 21:37:36 |
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2022-05-03 21:23:29 |
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2021-09-02 01:37:58 |
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2021-08-05 01:36:35 |
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2021-07-21 17:24:09 |
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2021-05-05 01:37:38 |
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2021-05-04 13:44:17 |
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2021-04-22 02:56:34 |
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2021-03-27 01:32:47 |
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2021-02-05 01:30:18 |
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2020-07-13 21:23:01 |
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2020-05-23 02:35:26 |
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