Executive Summary
| Informations | |||
|---|---|---|---|
| Name | CVE-2018-12891 | First vendor Publication | 2018-07-02 |
| Vendor | Cve | Last vendor Modification | 2019-10-03 |
Security-Database Scoring CVSS v3
| Cvss vector : CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H | |||
|---|---|---|---|
| Overall CVSS Score | 6.5 | ||
| Base Score | 6.5 | Environmental Score | 6.5 |
| impact SubScore | 4 | Temporal Score | 6.5 |
| Exploitabality Sub Score | 2 | ||
| Attack Vector | Local | Attack Complexity | Low |
| Privileges Required | Low | User Interaction | None |
| Scope | Changed | Confidentiality Impact | None |
| Integrity Impact | None | Availability Impact | High |
| Calculate full CVSS 3.0 Vectors scores | |||
Security-Database Scoring CVSS v2
| Cvss vector : (AV:L/AC:L/Au:N/C:N/I:N/A:C) | |||
|---|---|---|---|
| Cvss Base Score | 4.9 | Attack Range | Local |
| Cvss Impact Score | 6.9 | Attack Complexity | Low |
| Cvss Expoit Score | 3.9 | Authentication | None Required |
| Calculate full CVSS 2.0 Vectors scores | |||
Detail
| An issue was discovered in Xen through 4.10.x. Certain PV MMU operations may take a long time to process. For that reason Xen explicitly checks for the need to preempt the current vCPU at certain points. A few rarely taken code paths did bypass such checks. By suitably enforcing the conditions through its own page table contents, a malicious guest may cause such bypasses to be used for an unbounded number of iterations. A malicious or buggy PV guest may cause a Denial of Service (DoS) affecting the entire host. Specifically, it may prevent use of a physical CPU for an indeterminate period of time. All Xen versions from 3.4 onwards are vulnerable. Xen versions 3.3 and earlier are vulnerable to an even wider class of attacks, due to them lacking preemption checks altogether in the affected code paths. Only x86 systems are affected. ARM systems are not affected. Only multi-vCPU x86 PV guests can leverage the vulnerability. x86 HVM or PVH guests as well as x86 single-vCPU PV ones cannot leverage the vulnerability. |
Original Source
| Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12891 |
CPE : Common Platform Enumeration
Nessus® Vulnerability Scanner
| Date | Description |
|---|---|
| 2019-01-03 | Name : The remote Fedora host is missing a security update. File : fedora_2018-a7862a75f5.nasl - Type : ACT_GATHER_INFO |
| 2018-11-13 | Name : The remote Debian host is missing a security update. File : debian_DLA-1577.nasl - Type : ACT_GATHER_INFO |
| 2018-10-31 | Name : The remote Gentoo host is missing one or more security-related patches. File : gentoo_GLSA-201810-06.nasl - Type : ACT_GATHER_INFO |
| 2018-07-27 | Name : A server virtualization platform installed on the remote host is affected by ... File : citrix_xenserver_CTX235748.nasl - Type : ACT_GATHER_INFO |
| 2018-07-24 | Name : The remote Fedora host is missing a security update. File : fedora_2018-1a467757ce.nasl - Type : ACT_GATHER_INFO |
| 2018-06-29 | Name : The remote Debian host is missing a security-related update. File : debian_DSA-4236.nasl - Type : ACT_GATHER_INFO |
Sources (Detail)
Alert History
| Date | Informations |
|---|---|
| 2021-09-02 01:28:29 |
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| 2021-05-04 13:08:35 |
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| 2021-04-22 02:22:10 |
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| 2021-03-27 01:24:18 |
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| 2020-05-23 02:11:03 |
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| 2020-05-23 01:07:06 |
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| 2019-10-10 13:20:49 |
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| 2019-10-03 09:20:50 |
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| 2019-04-28 01:00:43 |
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| 2019-03-29 21:19:30 |
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| 2018-11-13 17:19:24 |
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| 2018-10-31 13:21:24 |
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| 2018-09-06 21:19:56 |
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| 2018-09-05 05:18:33 |
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| 2018-09-05 00:19:36 |
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| 2018-07-04 09:19:47 |
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| 2018-07-02 21:19:43 |
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