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CVE-2021-28711

Common vulnerabilities & exposures (CVE)

CVE databaseCVE database blogpostRelease & EoL database
 
Published at: - 05-01-2022 06:15
Last modified: - 06-04-2022 06:18
Total changes: - 5

Description

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

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Low
Attack complexity
Local
Attack vector
High
Availability
None
Confidentiality
None
Integrity
Low
Privileges required
Changed
Scope
None
User interaction
6.5
Base score
2.0
4.0
Exploitability score
Impact score
 

Verification logic

OR
OR
vendor=xen AND product=xen AND version=-
OR
vendor=Debian AND product=debian_linux AND version=9.0
vendor=Debian AND product=debian_linux AND version=10.0
vendor=Debian AND product=debian_linux AND version=11.0
 

Reference

 


Keywords

NVD

 

CVE-2021-28711

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures

 

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