CVE-2020-27674

Common vulnerabilities & exposures (CVE)

CVE database CVE database blogpost Release & EoL database

Published at: - 22-10-2020 11:15

Last modified: - 26-04-2022 06:29

Total changes: - 5

Description

An issue was discovered in Xen through 4.14.x allowing x86 PV guest OS users to gain guest OS privileges by modifying kernel memory contents, because invalidation of TLB entries is mishandled during use of an INVLPG-like attack technique.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Low

Attack complexity

Local

Attack vector

Low

Availability

Low

Confidentiality

Low

Integrity

Low

Privileges required

Unchanged

Scope

None

User interaction

5.3

Base score

1.8

3.4

Exploitability score

Impact score

Verification logic

vendor=xen AND product=xen AND target_hardware=x86 AND versionEndIncluding=4.14.0

vendor=fedoraproject AND product=fedora AND version=31

vendor=fedoraproject AND product=fedora AND version=32

vendor=fedoraproject AND product=fedora AND version=33

vendor=Debian AND product=debian_linux AND version=10.0

Reference

https://xenbits.xen.org/xsa/advisory-286.html
GLSA-202011-06-Third Party Advisory
FEDORA-2020-5398bfb466-Mailing List, Third Party Advisory
FEDORA-2020-ec84c1565b-Mailing List, Third Party Advisory
FEDORA-2020-6dd36a716c-Mailing List, Third Party Advisory
DSA-4804-Third Party Advisory
[oss-security] 20210119 Xen Security Advisory 286 v6 (CVE-2020-27674) - x86 PV guest INVLPG-like flushes may leave stale TLB entries-Mailing List, Third Party Advisory

Keywords

CVE-2020-27674

Common vulnerabilities & exposures (CVE)

Description

Common Vulnerability Scoring System (CVSS)

Verification logic

Reference

NVD

CVE-2020-27674

CVE

Common vulnerabilities & exposures

CVSS

Common vulnerability scoring system

Security

Vulnerabilities

Exposures