#VU31983 Infinite loop in Xen - CVE-2019-17349

Vulnerability identifier: #VU31983

Vulnerability risk: Medium

CVSSv4.0: 5.6 [CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:U/U:Green]

CVE-ID: CVE-2019-17349

CWE-ID: CWE-835

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.

An issue was discovered in Xen through 4.12.x allowing Arm domU attackers to cause a denial of service (infinite loop) involving a LoadExcl or StoreExcl operation.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Xen: 4.8.0 - 4.12.0

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External links
https://xenbits.xen.org/xsa/advisory-295.html
https://seclists.org/bugtraq/2020/Jan/21
https://www.debian.org/security/2020/dsa-4602
https://xenbits.xen.org/xsa/advisory-295.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 local network (LAN).

Is there known malware, which exploits this vulnerability?

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