Xen CVE-2019-18420 Denial of Service Vulnerability

Description

Xen is prone to a denial-of-service vulnerability. Attackers can exploit this issue to crash the affected application, denying service to legitimate users. Xen Xen version 4.6 and later are vulnerable.

Technologies Affected

• Xen Xen 4.10
• Xen Xen 4.10.0
• Xen Xen 4.10.1
• Xen Xen 4.10.2
• Xen Xen 4.11.0
• Xen Xen 4.12.0
• Xen Xen 4.6.0
• Xen Xen 4.6.3
• Xen Xen 4.7.0
• Xen Xen 4.8
• Xen Xen 4.8.0
• Xen Xen 4.8.4
• Xen Xen 4.9
• Xen Xen 4.9.0
• Xen Xen 4.9.1
• Xen Xen 4.9.2
• Xen Xen 4.9.3

Recommendations

Block external access at the network boundary, unless external parties require service.
If global access isn’t needed, filter access to the affected computer at the network boundary. Restricting access to only trusted computers and networks might greatly reduce the likelihood of successful exploits.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy NIDS to monitor network traffic for signs of anomalous or suspicious activity. This may indicate exploit attempts or activity that results from successful exploits.

Updates are available. Please see the references or vendor advisory for more information.