Denial of service in Xen

Published: 2019-06-13 | Updated: 2020-07-28

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2019-17349 CVE-2019-17350
CWE-ID	CWE-835
Exploitation vector	Local network
Public exploit	N/A
Vulnerable software Subscribe	Xen Server applications / Virtualization software
Vendor	Xen Project

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Infinite loop

EUVDB-ID: #VU31983

Risk: Medium

CVSSv3.1: 5.9 [CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-17349

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Exploit availability: No

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

External links

http://xenbits.xen.org/xsa/advisory-295.html
http://seclists.org/bugtraq/2020/Jan/21
http://www.debian.org/security/2020/dsa-4602
http://xenbits.xen.org/xsa/advisory-295.html

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.

2) Infinite loop

EUVDB-ID: #VU31984