CVE-2019-19582

An issue was discovered in Xen through 4.12.x allowing x86 guest OS users to cause a denial of service infinite loop because certain bit iteration is mishandled. In a number of places bitmaps are being used by the hypervisor to track certain state. Iteration over all bits involves functions which...

CVE-2019-19578

An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to cause a denial of service via degenerate chains of linear pagetables, because of an incorrect fix for CVE-2017-15595. "Linear pagetables" is a technique which involves either pointing a pagetable at itself, or to...

CVE-2019-19582

An issue was discovered in Xen through 4.12.x allowing x86 guest OS users to cause a denial of service infinite loop because certain bit iteration is mishandled. In a number of places bitmaps are being used by the hypervisor to track certain state. Iteration over all bits involves functions which...

find_next_bit() issues

ISSUE DESCRIPTION In a number of places bitmaps are being used by the hypervisor to track certain state. Iteration over all bits involves functions which may misbehave in certain corner cases: - On 32-bit Arm accesses to bitmaps with bit a count which is a multiple of 32, an out of bounds access...

Latest Microsoft Update Patches New Windows 0-Day Under Active Attack

With its latest and last Patch Tuesday for 2019, Microsoft is warning billions of its users of a new Windows zero-day vulnerability that attackers are actively exploiting in the wild in combination with a Chrome exploit to take remote control over vulnerable computers. Microsoft's December securi...

Citrix Hypervisor Security Update

Description of Problem A number of vulnerabilities have been found in Citrix Hypervisor formerly Citrix XenServer that may: i. Allow the host to be compromised by privileged code in a PV guest VM, ii. allow unprivileged code in a HVM guest VM to cause that guest to crash and iii. under certain...

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...

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...

CVE-2019-5544

OpenSLP as used in ESXi and the Horizon DaaS appliances has a heap overwrite issue. VMware has evaluated the severity of this issue to be in the Critical severity range with a maximum CVSSv3 base score of 9.8...

DEBIAN-CVE-2019-19579

An issue was discovered in Xen through 4.12.x allowing attackers to gain host OS privileges via DMA in a situation where an untrusted domain has access to a physical device and assignable-add is not used, because of an incomplete fix for CVE-2019-18424. XSA-302 relies on the use of libxl's...

Explained: What is containerization?

Containerization. Another one of those tech buzzwords folks love to say but often have no idea what it means. A better way to organize children's toys? The act of bringing tupperware out to dinner to safely transport home leftovers? Another name for Russian dolls? Containerization is, of course,...

Kernel: KVM: nVMX: use-after-free of the hrtimer for emulation of the preemption timer

A use-after-free vulnerability was found in the way the Linux kernel's KVM hypervisor emulates a preemption timer for L2 guests when nested =1 virtualization is enabled. This high resolution timerhrtimer runs when a L2 guest is active. After VM exit, the syncvmcs12 timer object is stopped. The...

NewStart CGSL CORE 5.04 / MAIN 5.04 : kernel-rt Multiple Vulnerabilities (NS-SA-2019-0222)

The remote NewStart CGSL host, running version CORE 5.04 / MAIN 5.04, has kernel-rt packages installed that are affected by multiple vulnerabilities: - Microarchitectural Store Buffer Data Sampling MSBDS: Store buffers on some microprocessors utilizing speculative execution may allow an...

[SECURITY] Fedora 31 Update: xen-4.12.1-7.fc31

This package contains the XenD daemon and xm command line tools, needed to manage virtual machines running under the Xen hypervisor...

CVE-2019-6670

On BIG-IP 15.0.0-15.0.1, 14.1.0-14.1.2, 14.0.0-14.0.1, 13.1.0-13.1.3.1, 12.1.0-12.1.5, and 11.5.1-11.6.5, vCMP hypervisors are incorrectly exposing the plaintext unit key for their vCMP guests on the filesystem...

CVE-2019-6670

CVE-2019-6670 affects F5 BIG-IP vCMP hypervisors. The vulnerability arises from a flaw that causes plaintext unit keys for vCMP guests to be exposed on the filesystem. Affected versions include BIG-IP 15.0.0–15.0.1, 14.1.0–14.1.2, 14.0.0–14.0.1, 13.1.0–13.1.3.1, 12.1.0–12.1.5, and 11.5.1–11.6.5. ...

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...

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...

Xen Restartable PV Type Change Operations Elevation of Privilege Vulnerability (XSA-299)

According to its self-reported version number, the Xen hypervisor installed on the remote host is affected by an elevation of privilege vulnerability due to race conditions in the pagetable promotion and demotion operations. An authenticated, remote attacker can exploit this issue, by triggering...