Design/Logic Flaw

An out-of-bounds access issue was found in the Linux kernel, all versions through 5.3, in the way Linux kernel's KVM hypervisor implements the Coalesced MMIO write operation. It operates on an MMIO ring buffer 'struct kvmcoalescedmmio' object, wherein write indices 'ring-first' and 'ring-last'...

CVE-2019-14821

An out-of-bounds access issue was found in the Linux kernel, all versions through 5.3, in the way Linux kernel's KVM hypervisor implements the Coalesced MMIO write operation. It operates on an MMIO ring buffer 'struct kvmcoalescedmmio' object, wherein write indices 'ring-first' and 'ring-last'...

CVE-2019-14821

An out-of-bounds access issue was found in the Linux kernel, all versions through 5.3, in the way Linux kernel's KVM hypervisor implements the Coalesced MMIO write operation. It operates on an MMIO ring buffer 'struct kvmcoalescedmmio' object, wherein write indices 'ring-first' and 'ring-last'...

CVE-2019-14821

CVE-2019-14821 is a Linux kernel KVM issue: an out-of-bounds access in the Coalesced MMIO write path can occur if a host user controls the MMIO ring buffer indices (ring->first/ring->last). A local attacker with /dev/kvm access could crash the host kernel or potentially escalate privileges ...

Oracle Linux 8 : kernel (ELSA-2019-2703)

The remote Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2019-2703 advisory. - wireless mwifiex: fix 802.11n/WPA detection Jarod Wilson 1714475 1714476 CVE-2019-3846 - x86 x86/entry/64: Use JMP instead of JMPQ Josh Poimboeuf...

Kernel: KVM: nVMX: guest accesses L0 MSR causes potential DoS

A flaw was found in the way KVM hypervisor handled x2APIC Machine Specific Register MSR access with nested=1 virtualization enabled. In that, L1 guest could access L0's APIC register values via L2 guest, when 'virtualize x2APIC mode' is enabled. A guest could use this flaw to potentially crash th...

Attacking the VM Worker Process

In the past year we invested a lot of time making Hyper-V research more accessible to everyone. Our first blog post, “First Steps in Hyper-V Research”, describes the tools and setup for debugging the hypervisor and examines the interesting attack surfaces of the virtualization stack components. W...

Attacking the VM Worker Process

In the past year we invested a lot of time making Hyper-V research more accessible to everyone. Our first blog post, “First Steps in Hyper-V Research”, describes the tools and setup for debugging the hypervisor and examines the interesting attack surfaces of the virtualization stack components. W...

Attacking the VM Worker Process

In the past year we invested a lot of time making Hyper-V research more accessible to everyone. Our first blog post, “First Steps in Hyper-V Research”, describes the tools and setup for debugging the hypervisor and examines the interesting attack surfaces of the virtualization stack components. W...

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...

Applepie - A Hypervisor For Fuzzing Built With WHVP And Bochs

Hello! Welcome to applepie! This is a tool designed for fuzzing, introspection, and finding bugs! This is a hypervisor using the Windows Hypervisor Platform API present in recent versions of Windows specifically this was developed and tested on Windows 10 17763. Bochs is used for providing deep...

The vulnerabilities of the functions virConnectBaselineHypervisorCPU() and virConnectCompareHypervisorCPU() in the Libvirt management library allow a attacker to execute arbitrary code or escalate their privileges.

The vulnerabilities of the functions virConnectBaselineHypervisorCPU and virConnectCompareHypervisorCPU in the Libvirt management library are due to access control errors. Exploiting these vulnerabilities can allow an attacker to execute arbitrary code or increase their privileges...

NewStart CGSL CORE 5.04 / MAIN 5.04 : kernel Multiple Vulnerabilities (NS-SA-2019-0044)

The remote NewStart CGSL host, running version CORE 5.04 / MAIN 5.04, has kernel packages installed that are affected by multiple vulnerabilities: - A buffer overflow vulnerability due to a lack of input filtering of incoming fragmented datagrams was found in the IP-over-1394 driver firewire-net ...

NewStart CGSL CORE 5.05 / MAIN 5.05 : kernel-rt Multiple Vulnerabilities (NS-SA-2019-0086)

The remote NewStart CGSL host, running version CORE 5.05 / MAIN 5.05, has kernel-rt packages installed that are affected by multiple vulnerabilities: - Modern Intel microprocessors implement hardware-level micro-optimizations to improve the performance of writing data back to CPU caches. The writ...

NewStart CGSL CORE 5.05 / MAIN 5.05 : kernel Multiple Vulnerabilities (NS-SA-2019-0085)

The remote NewStart CGSL host, running version CORE 5.05 / MAIN 5.05, has kernel packages installed that are affected by multiple vulnerabilities: - 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...

Kernel: KVM: leak of uninitialized stack contents to guest

An information leakage issue was found in the way Linux kernel's KVM hypervisor handled page fault exceptions while emulating instructions like VMXON, VMCLEAR, VMPTRLD, and VMWRITE with memory address as an operand. It occurs if the operand is a mmio address, as the returned exception object hold...

PT-2019-17778 · Freebsd · Freebsd

Name of the Vulnerable Software and Affected Versions: FreeBSD versions 11.2-RELEASE through 11.2-RELEASE-p12 FreeBSD versions 11.3-RELEASE through 11.3-RELEASE-p1 FreeBSD versions 12.0-RELEASE through 12.0-RELEASE-p8 Description: The issue arises from the bhyve e1000 device emulation, which uses...

ALPINE-CVE-2019-10168

The virConnectBaselineHypervisorCPU and virConnectCompareHypervisorCPU libvirt APIs, 4.x.x before 4.10.1 and 5.x.x before 5.4.1, accept an "emulator" argument to specify the program providing emulation for a domain. Since v1.2.19, libvirt will execute that program to probe the domain's...

CVE-2019-10142

A flaw was found in the Linux kernel's freescale hypervisor manager implementation, kernel versions 5.0.x up to, excluding 5.0.17. A parameter passed to an ioctl was incorrectly validated and used in size calculations for the page size calculation. An attacker can use this flaw to crash the syste...

DEBIAN-CVE-2019-10142

A flaw was found in the Linux kernel's freescale hypervisor manager implementation, kernel versions 5.0.x up to, excluding 5.0.17. A parameter passed to an ioctl was incorrectly validated and used in size calculations for the page size calculation. An attacker can use this flaw to crash the syste...