Vulnerability identifier: #VU46983

Vulnerability risk: High

CVSSv3.1: 8.6 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-25599

CWE-ID: CWE-362

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

Description

The vulnerability allows a remote user to escalate privileges on the system.

The vulnerability exists due to a race condition caused by uses of EVTCHNOP_reset (potentially by a guest on itself) or XEN_DOMCTL_soft_reset (by itself covered by XSA-77). A remote user on the PV guest can exploit the race and gain unauthorized access to sensitive information and escalate privileges on the host system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Xen: 4.5.0 - 4.14.0

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External links
http://xenbits.xen.org/xsa/advisory-343.html

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.