Xen CVE-2019-19580 Incomplete Fix Local Privilege Escalation Vulnerability

Description Xen is prone to a local privilege-escalation vulnerability. Local attacker can exploit this issue to gain elevated privileges on affected computers. Xen version 4.12.x and prior are vulnerable. Technologies Affected Citrix Hypervisor 8.0 Citrix XenServer 7.0 Citrix XenServer 7.1 LTSR...

Xen CVE-2019-19577 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 through 4.12.0 are vulnerable. Technologies Affected Citrix Hypervisor 8.0 Citrix XenServer 7.0 Citrix XenServer...

Xen CVE-2019-19583 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 through 4.12.0 are vulnerable. Technologies Affected Citrix Hypervisor 8.0 Citrix XenServer 7.0 Citrix XenServer...

Control domain memory leak issue on Citrix Hypervisor 8.0 when GPU in use

1. Any operation on VMs start, shutdown, creating and removing snapshot etc. with GPU are extremely slow 2. Citrix Hypervisor 8.0 freezing when GPU in use...

Ubuntu 18.04.2 VMs can fail to boot on Citrix Hypervisor (formerly XenServer)

When creating an Ubuntu 18.04.2 or18.04.3VM or updating an existing VM to Ubuntu 18.04.2 or 18.04.3, your VM can fail to boot. The console shows the boot sequence hung at the point "Starting Tool to automatically collect and submit kernel crash signatures..." If you switch the console to shell mo...

Citrix Hypervisor Security Update

Description of Problem A security issue has been identified in certain CPU hardware that may allow unprivileged code running on a CPU core to infer the value of memory data belonging to other processes, virtual machines or the hypervisor that are, or have recently been, running on the same CPU...

Multiple Intel Processors Side Channel CVE-2019-11135 Information Disclosure Vulnerability

Description Multiple Intel Processors are prone to a local information-disclosure vulnerability. A local attacker can leverage this issue to obtain sensitive information that may aid in further attacks. Technologies Affected Citrix Hypervisor 8.0 Citrix XenServer 7.0 Citrix XenServer 7.1 LTSR CU2...

Citrix Hypervisor Security Update

Description of Problem A number of vulnerabilities have been found in Citrix Hypervisor formerly Citrix XenServer that allow the host to be compromised by: i. Privileged code in a guest VM that has been assigned a PCI passthrough device ii. Privileged code in a PV guest VM iii. Unprivileged code ...

Xen CVE-2019-18424 Privilege Escalation Vulnerability

Description Xen is prone to a privilege-escalation vulnerability. An attacker can exploit this issue to gain elevated privileges on the affected system. Technologies Affected Citrix Hypervisor 8.0 Citrix XenServer 7.0 Citrix XenServer 7.1 LTSR CU2 Citrix XenServer 7.6 Xen Xen 3.2.0 Xen Xen 3.2.1...

Xen CVE-2019-18425 Privilege Escalation Vulnerability

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 Citr...

Xen CVE-2019-18421 Privilege Escalation Vulnerability

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 Citr...

Errors testing new connector to CHv 8 - "Connection Error: A failure occurred connecting to Citrix Hypervisor. Error = write EPROTO 140247625111360:error:1407742E:SSL routines:SSL23_GET_SERVER_HELLO:tlsv1 alert protocol"

When i try to configure a connector for this server on Citrix Hypervisor 8, if we check "Use Secured Communications", we get the error "Failed to connect to the server at ...". If we uncheck "Use Secured Communications" and "Ignore Certificate Errors", we can configure the connector. In the file...

Collect a complete memory dump on a MCS (non-persistent) machine on XenServer (Citrix Hypervisor)

This article outlines the steps to collect complete memory dump on a MCS non-persistent machine on XenServer Citrix Hypervisor. Often we are not able to get the memory dump in instances where MCS provisioned VDAs show behaviors like unresponsiveness/hang. The reason being the machine fails to sav...

Citrix Hypervisor Security Update.

Description of Problem A vulnerability has been found in Citrix Hypervisor formerly Citrix XenServer that may allow an unauthenticated attacker with the ability to send traffic to a host over a management or storage network to cause the host to crash. This vulnerability is identified as: •...

Citrix Hypervisor Security Update

Description of Problem A number of security issues have been identified in certain CPU hardware that may allow unprivileged code running on a CPU core to infer the value of memory data belonging to other processes, virtual machines or the hypervisor that are, or have recently been, running on the...

XenServer Hardware Compatibility List Explained

This article provides an understanding of the Hardware Compatibility List HCL for Citrix Hypervisor and XenServer. This article also contains information about how products get qualified for inclusion in the HCL and what listing in the HCL represents from a support perspective. Background The...

Citrix Hypervisor Export Running VM - Export snapshot to file through CLI

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How to pin Citrix Hypervisor Virtual CPUs to specific Physical CPUs

Citrix Hypervisor maps vCPUs to pCPUs by default in a semi-even way to distribute VM load on the host. In some cases it may be needed to have a specific mapping, for example, if some VMs will be CPU intensive while other wont, the intensive VMs can be mapped to exclusive physical CPUs while the...

Citrix Hypervisor Cannot Boot VM - Inaccessible_boot_device

After booting the VM an "Inaccessible Boot Device" error appears. The error may also appear as "The boot selection failed because a required device is inaccessible". This may be a critical VM that needs to be restored fast...

Troubleshooting common issues with XenServer clustered pools and GFS2 SRs

XenServer uses GFS2 to make thin provisioning available by using block-based storage devices that are accessed through iSCSI software initiator or Hardware HBA. This article provides a guide for troubleshooting common issues when GFS2 SRThin Provisioning is being used in XenServer or Citrix...