Vulnerability identifier: #VU81895

Vulnerability risk: Medium

CVSSv3.1: 4.3 [CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-34323

CWE-ID: CWE-617

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

Description

The vulnerability allows a remote guest to perform a denial of service (DoS) attack.

The vulnerability exists due to a reachable assertion when handling negative quota values in C Xenstored. A malicious guest can craft a transaction that forces C Xenstored to check quota value and perform a denial of service attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Xen: All versions

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External links
http://xenbits.xen.org/xsa/advisory-440.html

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Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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