CVE-2020-27674

medium
New! CVE Severity Now Using CVSS v3

The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

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.

References

https://xenbits.xen.org/xsa/advisory-286.html

https://security.gentoo.org/glsa/202011-06

https://lists.fedoraproject.org/archives/list/[email protected]/message/U3U4LNKKXU4UP4Z5XP6TMIWSML3QODPE/

https://lists.fedoraproject.org/archives/list/[email protected]/message/PZAM3LYJ5TZLSSNL3KXFILM46QKVTOUA/

https://lists.fedoraproject.org/archives/list/[email protected]/message/XIK57QJOVOPWH6RFRNMGOBCROBCKMDG2/

https://www.debian.org/security/2020/dsa-4804

http://www.openwall.com/lists/oss-security/2021/01/19/5

Details

Source: MITRE

Published: 2020-10-22

Updated: 2021-07-21

Type: CWE-119

Risk Information

CVSS v2

Base Score: 4.6

Vector: AV:L/AC:L/Au:N/C:P/I:P/A:P

Impact Score: 6.4

Exploitability Score: 3.9

Severity: MEDIUM

CVSS v3

Base Score: 5.3

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

Impact Score: 3.4

Exploitability Score: 1.8

Severity: MEDIUM

Vulnerable Software

Configuration 1

OR

cpe:2.3:o:xen:xen:*:*:*:*:*:*:x86:* versions up to 4.14.0 (inclusive)

Tenable Plugins

View all (14 total)

IDNameProductFamilySeverity
150513SUSE SLES11 Security Update : xen (SUSE-SU-2020:14557-1)NessusSuSE Local Security Checks
high
145062Xen INVLPG-like flushes may leave stale TLB entries privilege escalation (XSA-286)NessusMisc.
medium
144102SUSE SLES12 Security Update : xen (SUSE-SU-2020:3742-1)NessusSuSE Local Security Checks
high
143878SUSE SLED15 / SLES15 Security Update : xen (SUSE-SU-2020:3615-1)NessusSuSE Local Security Checks
high
143861SUSE SLED15 / SLES15 Security Update : xen (SUSE-SU-2020:3611-1)NessusSuSE Local Security Checks
high
143824SUSE SLES12 Security Update : xen (SUSE-SU-2020:3653-1)NessusSuSE Local Security Checks
high
143674SUSE SLES12 Security Update : xen (SUSE-SU-2020:3631-1)NessusSuSE Local Security Checks
high
143538openSUSE Security Update : xen (openSUSE-2020-2192)NessusSuSE Local Security Checks
high
143506openSUSE Security Update : xen (openSUSE-2020-2162)NessusSuSE Local Security Checks
high
143500Debian DSA-4804-1 : xen - security updateNessusDebian Local Security Checks
high
143135Fedora 31 : xen (2020-6dd36a716c)NessusFedora Local Security Checks
high
142854GLSA-202011-06 : Xen: Multiple vulnerabilitiesNessusGentoo Local Security Checks
high
142839Fedora 33 : xen (2020-ec84c1565b)NessusFedora Local Security Checks
medium
142835Fedora 32 : xen (2020-5398bfb466)NessusFedora Local Security Checks
medium