CVE-2021-28711

Rogue backends can cause DoS of guests via high frequency events T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Xen offers the ability to run PV backends in regular unprivileged guests, typically referred to as "driver domains". Running PV backends in driver domains has one primary security advantage: if a driver domain gets compromised, it doesn't have the privileges to take over the system. However, a malicious driver domain could try to attack other guests via sending events at a high frequency leading to a Denial of Service in the guest due to trying to service interrupts for elongated amounts of time. There are three affected backends: * blkfront patch 1, CVE-2021-28711 * netfront patch 2, CVE-2021-28712 * hvc_xen (console) patch 3, CVE-2021-28713

CVSS v3.0 6.5 MEDIUM
CVSS v2.0 2.1 LOW

6.5^/10

CVSS v3.0 : MEDIUM

Vector :

Exploitability : 2.0 / Impact : 4.0

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope CHANGED

2.1^/10

CVSS v2.0 : LOW

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

Exploitability : 3.9 / Impact : 2.9

Access Vector LOCAL

Access Complexity LOW

Authentication NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact PARTIAL

References

Link	Resource
https://xenbits.xenproject.org/xsa/advisory-391.txt	Patch Vendor Advisory
https://www.debian.org/security/2022/dsa-5050	Third Party Advisory
https://www.debian.org/security/2022/dsa-5096	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/03/msg00011.html	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html	Third Party Advisory

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Configurations

Configuration 1 (hide)

cpe:2.3:o:xen:xen:-:*:*:*:*:*:*:*

Configuration 2 (hide)

OR	cpe:2.3:o:debian:debian_linux:9.0:::::::*
	cpe:2.3:o:debian:debian_linux:10.0:::::::*
	cpe:2.3:o:debian:debian_linux:11.0:::::::*

Information

Published : 2022-01-05 09:15

Updated : 2022-04-06 09:18

NVD link : CVE-2021-28711

Mitre link : CVE-2021-28711

JSON object : View

CWE

NVD-CWE-noinfo

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Products Affected

debian

debian_linux

xen

xen

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