Xen CVE-2019-18421 Privilege Escalation Vulnerability

2019-10-31T00:00:00
ID SMNTC-110750
Type symantec
Reporter Symantec Security Response
Modified 2019-10-31T00:00:00

Description

Description

Xen is prone to a privilege-escalation vulnerability. An attacker can exploit this issue to gain elevated privileges, obtain sensitive information or cause denial-of-service conditions.

Technologies Affected

  • Citrix Hypervisor 8.0
  • Citrix XenServer 7.0
  • Citrix XenServer 7.1 LTSR CU2
  • Citrix XenServer 7.6
  • Xen Xen 2.0
  • Xen Xen 3.0.2
  • Xen Xen 3.0.3
  • Xen Xen 3.0.4
  • Xen Xen 3.1
  • Xen Xen 3.1.3
  • Xen Xen 3.1.4
  • Xen Xen 3.2
  • Xen Xen 3.2.0
  • Xen Xen 3.2.1
  • Xen Xen 3.2.2
  • Xen Xen 3.2.3
  • Xen Xen 3.3
  • Xen Xen 3.3.0
  • Xen Xen 3.3.1
  • Xen Xen 3.3.2
  • Xen Xen 3.4
  • Xen Xen 3.4.0
  • Xen Xen 3.4.1
  • Xen Xen 3.4.2
  • Xen Xen 3.4.3
  • Xen Xen 3.4.4
  • Xen Xen 4.0
  • Xen Xen 4.0.0
  • Xen Xen 4.0.1
  • Xen Xen 4.0.2
  • Xen Xen 4.0.3
  • Xen Xen 4.0.4
  • Xen Xen 4.1
  • Xen Xen 4.1.0
  • Xen Xen 4.1.1
  • Xen Xen 4.1.2
  • Xen Xen 4.1.3
  • Xen Xen 4.1.4
  • Xen Xen 4.1.5
  • Xen Xen 4.1.6.1
  • 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 4.2
  • Xen Xen 4.2.0
  • Xen Xen 4.2.1
  • Xen Xen 4.2.2
  • Xen Xen 4.2.3
  • Xen Xen 4.3
  • Xen Xen 4.3.0
  • Xen Xen 4.3.0-1
  • Xen Xen 4.3.1
  • Xen Xen 4.4
  • Xen Xen 4.4.0
  • Xen Xen 4.4.1
  • Xen Xen 4.5
  • Xen Xen 4.5.0
  • Xen Xen 4.5.3
  • 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

Disable all unnecessary services.
Use access controls to regulate external access to all services that are not intended to be publicly available.

Run all software as a nonprivileged user with minimal access rights.
To reduce the impact of latent vulnerabilities, always run nonadministrative software as an unprivileged user with minimal access rights.

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 includes but is not limited to requests that include NOP sleds and unexplained incoming and outgoing traffic. 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.