Vulnerability identifier: #VU29599

Vulnerability risk: Low

CVSSv3.1: 4.9 [CVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:C/C:N/I:N/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2020-15564

CWE-ID: CWE-399

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

Description

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

The vulnerability exists due to missing alignment check in VCPUOP_register_vcpu_info hypercall in Xen. A attacker with privileged access to guest operating system can crash the hypervisor.

Note: the vulnerability affects Arm systems only.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Xen: 4.0.0 - 4.13.1

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External links
http://www.openwall.com/lists/oss-security/2020/07/07/5
http://xenbits.xen.org/xsa/advisory-327.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 local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.