CVE-2022-42320

 

Published at: - 01-11-2022 02:15

Last modified: - 24-11-2022 04:15

Total changes: - 5

Description

Xenstore: Guests can get access to Xenstore nodes of deleted domains Access rights of Xenstore nodes are per domid. When a domain is gone, there might be Xenstore nodes left with access rights containing the domid of the removed domain. This is normally no problem, as those access right entries will be corrected when such a node is written later. There is a small time window when a new domain is created, where the access rights of a past domain with the same domid as the new one will be regarded to be still valid, leading to the new domain being able to get access to a node which was meant to be accessible by the removed domain. For this to happen another domain needs to write the node before the newly created domain is being introduced to Xenstore by dom0.

Common Vulnerability Scoring System (CVSS)

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

 

Verification logic

 

Reference

• https://xenbits.xenproject.org/xsa/advisory-417.txt
• http://xenbits.xen.org/xsa/advisory-417.html
• [oss-security] 20221101 Xen Security Advisory 417 v2 (CVE-2022-42320) - Xenstore: Guests can get access to Xenstore nodes of deleted domains-Mailing List, Third Party Advisory
• DSA-5272-Third Party Advisory
• FEDORA-2022-07438e12df-Mailing List, Third Party Advisory
• FEDORA-2022-99af00f60e-Mailing List, Third Party Advisory
• FEDORA-2022-9f51d13fa3-

 

Keywords

NVD

 

CVE-2022-42320

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures