CVE-2020-29570

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. Recording of the per-vCPU control block mapping maintained by Xen and that of pointers into the control block is reversed. The consumer assumes, seeing the former initialized, that the latter are also ready for use. Malicious or buggy guest kernels can mount a Denial of Service (DoS) attack affecting the entire system.

References

https://xenbits.xenproject.org/xsa/advisory-358.html

https://www.debian.org/security/2020/dsa-4812

http://www.openwall.com/lists/oss-security/2020/12/16/4

https://lists.fedoraproject.org/archives/list/[email protected]/message/OBLV6L6Q24PPQ2CRFXDX4Q76KU776GKI/

https://lists.fedoraproject.org/archives/list/[email protected]/message/2C6M6S3CIMEBACH6O7V4H2VDANMO6TVA/

Details

Source: MITRE

Published: 2020-12-15

Updated: 2021-07-12

Type: CWE-770

Risk Information

CVSS v2

Base Score: 4.9

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

Impact Score: 6.9

Exploitability Score: 3.9

Severity: MEDIUM

CVSS v3

Base Score: 6.2

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

Impact Score: 3.6

Exploitability Score: 2.5

Severity: MEDIUM

Tenable Plugins

View all (14 total)

IDNameProductFamilySeverity
150656SUSE SLES11 Security Update : xen (SUSE-SU-2020:14578-1)NessusSuSE Local Security Checks
high
150180OracleVM 3.4 : xen (OVMSA-2021-0014)NessusOracleVM Local Security Checks
high
145360openSUSE Security Update : xen (openSUSE-2020-2313)NessusSuSE Local Security Checks
high
145322openSUSE Security Update : xen (openSUSE-2020-2331)NessusSuSE Local Security Checks
high
144783Xen Control Block DoS (XSA-358)NessusMisc.
medium
144637SUSE SLES12 Security Update : xen (SUSE-SU-2020:3945-1)NessusSuSE Local Security Checks
high
144613Fedora 32 : xen (2020-df772b417b)NessusFedora Local Security Checks
high
144611Fedora 33 : xen (2020-64859a826b)NessusFedora Local Security Checks
high
144580SUSE SLED15 / SLES15 Security Update : xen (SUSE-SU-2020:3915-1)NessusSuSE Local Security Checks
high
144576SUSE SLES12 Security Update : xen (SUSE-SU-2020:3914-1)NessusSuSE Local Security Checks
high
144570SUSE SLES12 Security Update : xen (SUSE-SU-2020:3913-1)NessusSuSE Local Security Checks
high
144492SUSE SLES12 Security Update : xen (SUSE-SU-2020:3880-1)NessusSuSE Local Security Checks
medium
144476SUSE SLED15 / SLES15 Security Update : xen (SUSE-SU-2020:3881-1)NessusSuSE Local Security Checks
high
144322Debian DSA-4812-1 : xen - security updateNessusDebian Local Security Checks
high