CVE-2020-25599

 

Published at: - 24-09-2020 12:15

Last modified: - 28-04-2022 08:19

Total changes: - 3

Description

An issue was discovered in Xen through 4.14.x. There are evtchn_reset() race conditions. Uses of EVTCHNOP_reset (potentially by a guest on itself) or XEN_DOMCTL_soft_reset (by itself covered by XSA-77) can lead to the violation of various internal assumptions. This may lead to out of bounds memory accesses or triggering of bug checks. In particular, x86 PV guests may be able to elevate their privilege to that of the host. Host and guest crashes are also possible, leading to a Denial of Service (DoS). Information leaks cannot be ruled out. All Xen versions from 4.5 onwards are vulnerable. Xen versions 4.4 and earlier are not vulnerable.

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.xen.org/xsa/advisory-343.html
• FEDORA-2020-306b84fd07-Mailing List, Third Party Advisory
• FEDORA-2020-f668e579be-Mailing List, Third Party Advisory
• DSA-4769-Third Party Advisory
• openSUSE-SU-2020:1608-Mailing List, Third Party Advisory
• FEDORA-2020-d46fe34349-Mailing List, Third Party Advisory
• GLSA-202011-06-Third Party Advisory
• [oss-security] 20201216 Xen Security Advisory 343 v5 (CVE-2020-25599) - races with evtchn_reset()-Mailing List, Third Party Advisory

 

Keywords

NVD

 

CVE-2020-25599

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures