Xen up to 4.14.x AMD IOMMU Page-Table Entry denial of service

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CVSS Meta Temp Score
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CTI Interest Score
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5.4$0-$5k0.00

A vulnerability was found in Xen up to 4.14.x (Virtualization Software). It has been declared as problematic. Affected by this vulnerability is some unknown functionality of the component AMD IOMMU Page-Table Entry Handler. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. As an impact it is known to affect availability. The summary by CVE is:

An issue was discovered in Xen through 4.14.x allowing x86 guest OS users to cause a denial of service (data corruption), cause a data leak, or possibly gain privileges because an AMD IOMMU page-table entry can be half-updated.

The weakness was released 10/23/2020. The advisory is shared at xenbits.xen.org. This vulnerability is known as CVE-2020-27670 since 10/22/2020. The attack can only be initiated within the local network. A single authentication is required for exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

Applying a patch is able to eliminate this problem.

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VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.4

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔒

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VulDB Base Score: 🔒
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VulDB Reliability: 🔍

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Exploitinginfoedit

Class: Denial of service
CWE: CWE-404
ATT&CK: T1499

Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

Threat: 🔍
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Countermeasuresinfoedit

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Timelineinfoedit

10/22/2020 CVE assigned
10/23/2020 +1 days Advisory disclosed
10/23/2020 +0 days VulDB entry created
11/26/2020 +34 days VulDB last update

Sourcesinfoedit

Advisory: xenbits.xen.org
Status: Confirmed

CVE: CVE-2020-27670 (🔒)

Entryinfoedit

Created: 10/23/2020 01:43 PM
Updated: 11/26/2020 02:54 PM
Changes: (18) vulnerability_cvss3_nvd_av vulnerability_cvss3_nvd_ac vulnerability_cvss3_nvd_pr vulnerability_cvss3_nvd_ui vulnerability_cvss3_nvd_s vulnerability_cvss3_nvd_c vulnerability_cvss3_nvd_i vulnerability_cvss3_nvd_a vulnerability_cvss2_nvd_av vulnerability_cvss2_nvd_ac vulnerability_cvss2_nvd_au vulnerability_cvss2_nvd_ci vulnerability_cvss2_nvd_ii vulnerability_cvss2_nvd_ai vulnerability_cvss3_meta_basescore vulnerability_cvss3_meta_tempscore vulnerability_cvss2_nvd_basescore vulnerability_cvss3_nvd_basescore
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