Xen Multiple Privilege Escalation and Denial of Service Vulnerabilities

Bugtraq ID:	106182
Class:	Design Error
CVE:	CVE-2018-19962 CVE-2018-19963 CVE-2018-19964 CVE-2018-19965 CVE-2018-19966 CVE-2018-19961
Remote:	Yes
Local:	No
Published:	Dec 07 2018 12:00AM
Updated:	Apr 03 2019 12:00PM
Credit:	Paul Durrant, Matthew Daley, Julien Grall, the security team of Prgmr.com.
Vulnerable:	Xen Xen 4.11 Xen Xen 4.10.2 Xen Xen 4.9.3 Xen Xen 4.8.4 Xen Xen 4.0.4 Xen Xen 4.0.1 Xen Xen 4.1 Xen Xen 4.0.3 Xen Xen 4.0.2 Xen Xen 4.0.0 Xen Xen 4.0 Xen Xen 3.4.4 Xen Xen 3.4.3 Xen Xen 3.4.2 Xen Xen 3.4.1 Xen Xen 3.4.0 Xen Xen 3.4 Xen Xen 3.3.2 Xen Xen 3.3.1 Xen Xen 3.3.0 Xen Xen 3.3 Xen Xen 3.2.3 Xen Xen 3.2.2 Xen Xen 3.2.1 Xen Xen 3.2.0 Xen Xen 3.2 Citrix XenServer 7.6 Citrix XenServer 7.5 Citrix XenServer 7.1 LTSR CU1 Citrix XenServer 7.0
Not Vulnerable:

Xen Multiple Privilege Escalation and Denial of Service Vulnerabilities

Xen is prone to multiple privilege-escalation and denial-of-service vulnerabilities.

Successful exploits allow attackers with access to a guest operating system can exploit this issue to crash the host operating system, effectively denying service to legitimate users, to gain host privileges and perform unauthorized actions.

Xen Multiple Privilege Escalation and Denial of Service Vulnerabilities

Currently we are not aware of any working exploits. If you feel we are in error or if you are aware of more recent information, please mail us at: [email protected]

Xen Multiple Privilege Escalation and Denial of Service Vulnerabilities

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

Xen Multiple Privilege Escalation and Denial of Service Vulnerabilities

References:

• Citrix Homepage (Citrix)
  
• Xen HomePage (Xen)
  
• Fix for XSA-240 conflicts with shadow paging (Xen)
  
• Citrix XenServer Security Update (Citrix)
  
• insufficient TLB flushing / improper large page mappings with AMD IOMMUs (Xen)
  
• resource accounting issues in x86 IOREQ server handling (Xen)
  
• x86: DoS from attempting to use INVPCID with a non-canonical addresses (Xen)
  
• x86: incorrect error handling for guest p2m page removals (Xen)