Integer overflow in the qcow_open function in block/qcow.c in QEMU before 1.7.2 allows local users to cause a denial of service (crash) and possibly execute arbitrary code via a large image size, which triggers a buffer overflow or out-of-bounds read.

KVM was updated to fix the following security issues :

CVE-2015-3456: Buffer overflow in the floppy drive emulation, which could be used to carry out denial of service attacks or potential code execution against the host. This vulnerability is also known as VENOM.

CVE-2014-0222: Integer overflow in the qcow_open function in block/qcow.c in QEMU allowed remote attackers to cause a denial of service (crash) via a large L2 table in a QCOW version 1 image.

CVE-2014-0223: Integer overflow in the qcow_open function in block/qcow.c in QEMU allowed local users to cause a denial of service (crash) and possibly execute arbitrary code via a large image size, which triggers a buffer overflow or out-of-bounds read.

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Updated qemu packages fix multiple security vulnerabilities :

Sibiao Luo discovered that QEMU incorrectly handled device hot-unplugging. A local user could possibly use this flaw to cause a denial of service (CVE-2013-4377).

Michael S. Tsirkin discovered that QEMU incorrectly handled vmxnet3 devices. A local guest could possibly use this issue to cause a denial of service, or possibly execute arbitrary code on the host (CVE-2013-4544).

Multiple integer overflow, input validation, logic error, and buffer overflow flaws were discovered in various QEMU block drivers. An attacker able to modify a disk image file loaded by a guest could use these flaws to crash the guest, or corrupt QEMU process memory on the host, potentially resulting in arbitrary code execution on the host with the privileges of the QEMU process (CVE-2014-0143, CVE-2014-0144, CVE-2014-0145, CVE-2014-0147).

A buffer overflow flaw was found in the way the virtio_net_handle_mac() function of QEMU processed guest requests to update the table of MAC addresses. A privileged guest user could use this flaw to corrupt QEMU process memory on the host, potentially resulting in arbitrary code execution on the host with the privileges of the QEMU process (CVE-2014-0150).

A divide-by-zero flaw was found in the seek_to_sector() function of the parallels block driver in QEMU. An attacker able to modify a disk image file loaded by a guest could use this flaw to crash the guest (CVE-2014-0142).

A NULL pointer dereference flaw was found in the QCOW2 block driver in QEMU. An attacker able to modify a disk image file loaded by a guest could use this flaw to crash the guest (CVE-2014-0146).

It was found that the block driver for Hyper-V VHDX images did not correctly calculate BAT (Block Allocation Table) entries due to a missing bounds check. An attacker able to modify a disk image file loaded by a guest could use this flaw to crash the guest (CVE-2014-0148).

An out-of-bounds memory access flaw was found in the way QEMU's IDE device driver handled the execution of SMART EXECUTE OFFLINE commands.
A privileged guest user could use this flaw to corrupt QEMU process memory on the host, which could potentially result in arbitrary code execution on the host with the privileges of the QEMU process (CVE-2014-2894).

Two integer overflow flaws were found in the QEMU block driver for QCOW version 1 disk images. A user able to alter the QEMU disk image files loaded by a guest could use either of these flaws to corrupt QEMU process memory on the host, which could potentially result in arbitrary code execution on the host with the privileges of the QEMU process (CVE-2014-0222, CVE-2014-0223).

Multiple buffer overflow, input validation, and out-of-bounds write flaws were found in the way the virtio, virtio-net, virtio-scsi, and usb drivers of QEMU handled state loading after migration. A user able to alter the savevm data (either on the disk or over the wire during migration) could use either of these flaws to corrupt QEMU process memory on the (destination) host, which could potentially result in arbitrary code execution on the host with the privileges of the QEMU process (CVE-2013-4148, CVE-2013-4151, CVE-2013-4535, CVE-2013-4536, CVE-2013-4541, CVE-2013-4542, CVE-2013-6399, CVE-2014-0182, CVE-2014-3461).

An information leak flaw was found in the way QEMU's VGA emulator accessed frame buffer memory for high resolution displays. A privileged guest user could use this flaw to leak memory contents of the host to the guest by setting the display to use a high resolution in the guest (CVE-2014-3615).

When guest sends udp packet with source port and source addr 0, uninitialized socket is picked up when looking for matching and already created udp sockets, and later passed to sosendto() where NULL pointer dereference is hit during so->slirp->vnetwork_mask.s_addr access Only guests using qemu user networking are affected (CVE-2014-3640).

The Advanced Threat Research team at Intel Security reported that guest provided parameter were insufficiently validated in rectangle functions in the vmware-vga driver. A privileged guest user could use this flaw to write into qemu address space on the host, potentially escalating their privileges to those of the qemu host process (CVE-2014-3689).

It was discovered that QEMU incorrectly handled USB xHCI controller live migration. An attacker could possibly use this issue to cause a denial of service, or possibly execute arbitrary code (CVE-2014-5263).

James Spadaro of Cisco reported insufficiently sanitized bits_per_pixel from the client in the QEMU VNC display driver. An attacker having access to the guest's VNC console could use this flaw to crash the guest (CVE-2014-7815).

During migration, the values read from migration stream during ram load are not validated. Especially offset in host_from_stream_offset() and also the length of the writes in the callers of the said function.
A user able to alter the savevm data (either on the disk or over the wire during migration) could use either of these flaws to corrupt QEMU process memory on the (destination) host, which could potentially result in arbitrary code execution on the host with the privileges of the QEMU process (CVE-2014-7840).

Paolo Bonzini of Red Hat discovered that the blit region checks were insufficient in the Cirrus VGA emulator in qemu. A privileged guest user could use this flaw to write into qemu address space on the host, potentially escalating their privileges to those of the qemu host process (CVE-2014-8106).

This update also provides usbredirparser 0.6 as a prerequisite of qemu-1.6.2

Updated qemu packages fix security vulnerabilities :

Michael S. Tsirkin discovered that QEMU incorrectly handled vmxnet3 devices. A local guest could possibly use this issue to cause a denial of service, or possibly execute arbitrary code on the host (CVE-2013-4544).

Multiple integer overflow, input validation, logic error, and buffer overflow flaws were discovered in various QEMU block drivers. An attacker able to modify a disk image file loaded by a guest could use these flaws to crash the guest, or corrupt QEMU process memory on the host, potentially resulting in arbitrary code execution on the host with the privileges of the QEMU process (CVE-2014-0143, CVE-2014-0144, CVE-2014-0145, CVE-2014-0147).

A buffer overflow flaw was found in the way the virtio_net_handle_mac() function of QEMU processed guest requests to update the table of MAC addresses. A privileged guest user could use this flaw to corrupt QEMU process memory on the host, potentially resulting in arbitrary code execution on the host with the privileges of the QEMU process (CVE-2014-0150).

A divide-by-zero flaw was found in the seek_to_sector() function of the parallels block driver in QEMU. An attacker able to modify a disk image file loaded by a guest could use this flaw to crash the guest (CVE-2014-0142).

A NULL pointer dereference flaw was found in the QCOW2 block driver in QEMU. An attacker able to modify a disk image file loaded by a guest could use this flaw to crash the guest (CVE-2014-0146).

It was found that the block driver for Hyper-V VHDX images did not correctly calculate BAT (Block Allocation Table) entries due to a missing bounds check. An attacker able to modify a disk image file loaded by a guest could use this flaw to crash the guest (CVE-2014-0148).

An out-of-bounds memory access flaw was found in the way QEMU's IDE device driver handled the execution of SMART EXECUTE OFFLINE commands.
A privileged guest user could use this flaw to corrupt QEMU process memory on the host, which could potentially result in arbitrary code execution on the host with the privileges of the QEMU process (CVE-2014-2894).

Two integer overflow flaws were found in the QEMU block driver for QCOW version 1 disk images. A user able to alter the QEMU disk image files loaded by a guest could use either of these flaws to corrupt QEMU process memory on the host, which could potentially result in arbitrary code execution on the host with the privileges of the QEMU process (CVE-2014-0222, CVE-2014-0223).

Multiple buffer overflow, input validation, and out-of-bounds write flaws were found in the way the virtio, virtio-net, virtio-scsi, and usb drivers of QEMU handled state loading after migration. A user able to alter the savevm data (either on the disk or over the wire during migration) could use either of these flaws to corrupt QEMU process memory on the (destination) host, which could potentially result in arbitrary code execution on the host with the privileges of the QEMU process (CVE-2013-4148, CVE-2013-4151, CVE-2013-4535, CVE-2013-4536, CVE-2013-4541, CVE-2013-4542, CVE-2013-6399, CVE-2014-0182, CVE-2014-3461).

An information leak flaw was found in the way QEMU's VGA emulator accessed frame buffer memory for high resolution displays. A privileged guest user could use this flaw to leak memory contents of the host to the guest by setting the display to use a high resolution in the guest (CVE-2014-3615).

When guest sends udp packet with source port and source addr 0, uninitialized socket is picked up when looking for matching and already created udp sockets, and later passed to sosendto() where NULL pointer dereference is hit during so->slirp->vnetwork_mask.s_addr access Only guests using qemu user networking are affected (CVE-2014-3640).

The Advanced Threat Research team at Intel Security reported that guest provided parameter were insufficiently validated in rectangle functions in the vmware-vga driver. A privileged guest user could use this flaw to write into qemu address space on the host, potentially escalating their privileges to those of the qemu host process (CVE-2014-3689).

It was discovered that QEMU incorrectly handled USB xHCI controller live migration. An attacker could possibly use this issue to cause a denial of service, or possibly execute arbitrary code (CVE-2014-5263).

James Spadaro of Cisco reported insufficiently sanitized bits_per_pixel from the client in the QEMU VNC display driver. An attacker having access to the guest's VNC console could use this flaw to crash the guest (CVE-2014-7815).

Additionally qemu-1.6+ requires usbredir-0.6+ for USB redirection support which is also being provided with this advisory.

An updated rhev-hypervisor6 package that fixes three security issues and one bug is now available.

Red Hat Product Security has rated this update as having Important security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

The rhev-hypervisor6 package provides a Red Hat Enterprise Virtualization Hypervisor ISO disk image. The Red Hat Enterprise Virtualization Hypervisor is a dedicated Kernel-based Virtual Machine (KVM) hypervisor. It includes everything necessary to run and manage virtual machines: a subset of the Red Hat Enterprise Linux operating environment and the Red Hat Enterprise Virtualization Agent.

Note: Red Hat Enterprise Virtualization Hypervisor is only available for the Intel 64 and AMD64 architectures with virtualization extensions.

A NULL pointer dereference flaw was found in the way the Linux kernel's networking implementation handled logging while processing certain invalid packets coming in via a VxLAN interface. A remote attacker could use this flaw to crash the system by sending a specially crafted packet to such an interface. (CVE-2014-3535)

Two integer overflow flaws were found in the QEMU block driver for QCOW version 1 disk images. A user able to alter the QEMU disk image files loaded by a guest could use either of these flaws to corrupt QEMU process memory on the host, which could potentially result in arbitrary code execution on the host with the privileges of the QEMU process. (CVE-2014-0222, CVE-2014-0223)

Red Hat would like to thank NSA for reporting CVE-2014-0222 and CVE-2014-0223.

This update also fixes the following bug :

* Previously, an updated version of Qlogic firmware was not supported in the Red Hat Enterprise Virtualization Hypervisor 6.5 image and an error message returned when users were using a newer version of Qlogic firmware. This update includes the latest Qlogic firmware package in the Red Hat Enterprise Virtualization Hypervisor 6.5 image so no firmware errors are returned. (BZ#1135780)

This updated package also provides updated components that include fixes for various security issues. These issues have no security impact on Red Hat Enterprise Virtualization Hypervisor itself, however. The security fixes included in this update address the following CVE numbers :

CVE-2012-6647, CVE-2013-7339, CVE-2014-2672, CVE-2014-2678, CVE-2014-2706, CVE-2014-2851, CVE-2014-3144, CVE-2014-3145, CVE-2014-0205, CVE-2014-3917, and CVE-2014-4667 (kernel issues)

Users of the Red Hat Enterprise Virtualization Hypervisor are advised to upgrade to this updated package.

Updated qemu-kvm-rhev packages that fix two security issues and one bug are now available for Red Hat Enterprise Virtualization.

Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux on AMD64 and Intel 64 systems. The qemu-kvm-rhev package provides the user-space component for running virtual machines using KVM in environments managed by Red Hat Enterprise Virtualization Manager.

Two integer overflow flaws were found in the QEMU block driver for QCOW version 1 disk images. A user able to alter the QEMU disk image files loaded by a guest could use either of these flaws to corrupt QEMU process memory on the host, which could potentially result in arbitrary code execution on the host with the privileges of the QEMU process. (CVE-2014-0222, CVE-2014-0223)

Red Hat would like to thank NSA for reporting these issues.

This update also fixes the following bug :

* In certain scenarios, when performing live incremental migration, the disk size could be expanded considerably due to the transfer of unallocated sectors past the end of the base image. With this update, the bdrv_is_allocated() function has been fixed to no longer return 'True' for unallocated sectors, and the disk size no longer changes after performing live incremental migration. (BZ#1110681)

All users of qemu-kvm-rhev are advised to upgrade to these updated packages, which contain backported patches to correct these issues.
After installing this update, shut down all running virtual machines.
Once all virtual machines have shut down, start them again for this update to take effect.

kvm has been updated to fix issues in the embedded qemu :

  - An integer overflow flaw was found in the QEMU block     driver for QCOW version 1 disk images. A user able to     alter the QEMU disk image files loaded by a guest could     have used this flaw to corrupt QEMU process memory on     the host, which could potentially have resulted in     arbitrary code execution on the host with the privileges     of the QEMU process. (CVE-2014-0223)

  - A user able to alter the savevm data (either on the disk     or over the wire during migration) could have used this     flaw to to corrupt QEMU process memory on the     (destination) host, which could have potentially     resulted in arbitrary code execution on the host with     the privileges of the QEMU process. (CVE-2014-3461)

  - An integer overflow flaw was found in the QEMU block     driver for QCOW version 1 disk images. A user able to     alter the QEMU disk image files loaded by a guest could     have used this flaw to corrupt QEMU process memory on     the host, which could have potentially resulted in     arbitrary code execution on the host with the privileges     of the QEMU process. (CVE-2014-0222)

Non-security bugs fixed :

  - Fix exceeding IRQ routes that could have caused freezes     of guests. (bnc#876842)

  - Fix CPUID emulation bugs that may have broken Windows     guests with newer -cpu types (bnc#886535)

Several vulnerabilities were discovered in qemu, a fast processor emulator :

  - Various security issues have been found in the block     qemu drivers. Malformed disk images might result in the     execution of arbitrary code.
  - A NULL pointer dereference in SLIRP may result in denial     of service

  - An information leak was discovered in the VGA emulation

Several vulnerabilities were discovered in qemu-kvm, a full virtualization solution on x86 hardware :

  - Various security issues have been found in the block     qemu drivers. Malformed disk images might result in the     execution of arbitrary code.
  - A NULL pointer dereference in SLIRP may result in denial     of service

  - An information leak was discovered in the VGA emulation

Michael S. Tsirkin, Anthony Liguori, and Michael Roth discovered multiple issues with QEMU state loading after migration. An attacker able to modify the state data could use these issues to cause a denial of service, or possibly execute arbitrary code. (CVE-2013-4148, CVE-2013-4149, CVE-2013-4150, CVE-2013-4151, CVE-2013-4526, CVE-2013-4527, CVE-2013-4529, CVE-2013-4530, CVE-2013-4531, CVE-2013-4532, CVE-2013-4533, CVE-2013-4534, CVE-2013-4535, CVE-2013-4536, CVE-2013-4537, CVE-2013-4538, CVE-2013-4539, CVE-2013-4540, CVE-2013-4541, CVE-2013-4542, CVE-2013-6399, CVE-2014-0182, CVE-2014-3461)

Kevin Wolf, Stefan Hajnoczi, Fam Zheng, Jeff Cody, Stefan Hajnoczi, and others discovered multiple issues in the QEMU block drivers. An attacker able to modify disk images could use these issues to cause a denial of service, or possibly execute arbitrary code. (CVE-2014-0142, CVE-2014-0143, CVE-2014-0144, CVE-2014-0145, CVE-2014-0146, CVE-2014-0147, CVE-2014-0222, CVE-2014-0223)

It was discovered that QEMU incorrectly handled certain PCIe bus hotplug operations. A malicious guest could use this issue to crash the QEMU host, resulting in a denial of service. (CVE-2014-3471).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote host is affected by the vulnerability described in GLSA-201408-17 (QEMU: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in QEMU. Please review the       CVE identifiers referenced below for details.
  Impact :

    A local attacker could possibly execute arbitrary code with the       privileges of the process, or cause a Denial of       Service condition.
  Workaround :

    There is no known workaround at this time.

Updated qemu-kvm packages that fix two security issues and three bugs are now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux on AMD64 and Intel 64 systems. The qemu-kvm package provides the user-space component for running virtual machines using KVM.

Two integer overflow flaws were found in the QEMU block driver for QCOW version 1 disk images. A user able to alter the QEMU disk image files loaded by a guest could use either of these flaws to corrupt QEMU process memory on the host, which could potentially result in arbitrary code execution on the host with the privileges of the QEMU process. (CVE-2014-0222, CVE-2014-0223)

Red Hat would like to thank NSA for reporting these issues.

This update also fixes the following bugs :

* In certain scenarios, when performing live incremental migration, the disk size could be expanded considerably due to the transfer of unallocated sectors past the end of the base image. With this update, the bdrv_is_allocated() function has been fixed to no longer return 'True' for unallocated sectors, and the disk size no longer changes after performing live incremental migration. (BZ#1109715)

* This update enables ioeventfd in virtio-scsi-pci. This allows QEMU to process I/O requests outside of the vCPU thread, reducing the latency of submitting requests and improving single task throughput.
(BZ#1123271)

* Prior to this update, vendor-specific SCSI commands issued from a KVM guest did not reach the target device due to QEMU considering such commands as invalid. This update fixes this bug by properly propagating vendor-specific SCSI commands to the target device.
(BZ#1125131)

All qemu-kvm users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. After installing this update, shut down all running virtual machines. Once all virtual machines have shut down, start them again for this update to take effect.

Two integer overflow flaws were found in the QEMU block driver for QCOW version 1 disk images. A user able to alter the QEMU disk image files loaded by a guest could use either of these flaws to corrupt QEMU process memory on the host, which could potentially result in arbitrary code execution on the host with the privileges of the QEMU process. (CVE-2014-0222, CVE-2014-0223)

This update also fixes the following bugs :

  - In certain scenarios, when performing live incremental     migration, the disk size could be expanded considerably     due to the transfer of unallocated sectors past the end     of the base image. With this update, the     bdrv_is_allocated() function has been fixed to no longer     return 'True' for unallocated sectors, and the disk size     no longer changes after performing live incremental     migration.

  - This update enables ioeventfd in virtio-scsi-pci. This     allows QEMU to process I/O requests outside of the vCPU     thread, reducing the latency of submitting requests and     improving single task throughput.

  - Prior to this update, vendor-specific SCSI commands     issued from a KVM guest did not reach the target device     due to QEMU considering such commands as invalid. This     update fixes this bug by properly propagating     vendor-specific SCSI commands to the target device.

After installing this update, shut down all running virtual machines.
Once all virtual machines have shut down, start them again for this update to take effect.

From Red Hat Security Advisory 2014:1075 :

Updated qemu-kvm packages that fix two security issues and three bugs are now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux on AMD64 and Intel 64 systems. The qemu-kvm package provides the user-space component for running virtual machines using KVM.

Two integer overflow flaws were found in the QEMU block driver for QCOW version 1 disk images. A user able to alter the QEMU disk image files loaded by a guest could use either of these flaws to corrupt QEMU process memory on the host, which could potentially result in arbitrary code execution on the host with the privileges of the QEMU process. (CVE-2014-0222, CVE-2014-0223)

Red Hat would like to thank NSA for reporting these issues.

This update also fixes the following bugs :

* In certain scenarios, when performing live incremental migration, the disk size could be expanded considerably due to the transfer of unallocated sectors past the end of the base image. With this update, the bdrv_is_allocated() function has been fixed to no longer return 'True' for unallocated sectors, and the disk size no longer changes after performing live incremental migration. (BZ#1109715)

* This update enables ioeventfd in virtio-scsi-pci. This allows QEMU to process I/O requests outside of the vCPU thread, reducing the latency of submitting requests and improving single task throughput.
(BZ#1123271)

* Prior to this update, vendor-specific SCSI commands issued from a KVM guest did not reach the target device due to QEMU considering such commands as invalid. This update fixes this bug by properly propagating vendor-specific SCSI commands to the target device.
(BZ#1125131)

All qemu-kvm users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. After installing this update, shut down all running virtual machines. Once all virtual machines have shut down, start them again for this update to take effect.

Updated qemu-kvm packages that fix multiple security issues and various bugs are now available for Red Hat Enterprise Linux 7.

The Red Hat Security Response Team has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux on AMD64 and Intel 64 systems. The qemu-kvm package provides the user-space component for running virtual machines using KVM.

Two integer overflow flaws were found in the QEMU block driver for QCOW version 1 disk images. A user able to alter the QEMU disk image files loaded by a guest could use either of these flaws to corrupt QEMU process memory on the host, which could potentially result in arbitrary code execution on the host with the privileges of the QEMU process. (CVE-2014-0222, CVE-2014-0223)

Multiple buffer overflow, input validation, and out-of-bounds write flaws were found in the way virtio, virtio-net, virtio-scsi, usb, and hpet drivers of QEMU handled state loading after migration. A user able to alter the savevm data (either on the disk or over the wire during migration) could use either of these flaws to corrupt QEMU process memory on the (destination) host, which could potentially result in arbitrary code execution on the host with the privileges of the QEMU process. (CVE-2013-4148, CVE-2013-4149, CVE-2013-4150, CVE-2013-4151, CVE-2013-4527, CVE-2013-4529, CVE-2013-4535, CVE-2013-4536, CVE-2013-4541, CVE-2013-4542, CVE-2013-6399, CVE-2014-0182, CVE-2014-3461)

These issues were discovered by Michael S. Tsirkin, Anthony Liguori and Michael Roth of Red Hat: CVE-2013-4148, CVE-2013-4149, CVE-2013-4150, CVE-2013-4151, CVE-2013-4527, CVE-2013-4529, CVE-2013-4535, CVE-2013-4536, CVE-2013-4541, CVE-2013-4542, CVE-2013-6399, CVE-2014-0182, and CVE-2014-3461.

This update also fixes the following bugs :

* Previously, QEMU did not free pre-allocated zero clusters correctly and the clusters under some circumstances leaked. With this update, pre-allocated zero clusters are freed appropriately and the cluster leaks no longer occur. (BZ#1110188)

* Prior to this update, the QEMU command interface did not properly handle resizing of cache memory during guest migration, causing QEMU to terminate unexpectedly with a segmentation fault and QEMU to fail.
This update fixes the related code and QEMU no longer crashes in the described situation. (BZ#1110191)

* Previously, when a guest device was hot unplugged, QEMU correctly removed the corresponding file descriptor watch but did not re-create it after the device was re-connected. As a consequence, the guest became unable to receive any data from the host over this device. With this update, the file descriptor's watch is re-created and the guest in the above scenario can communicate with the host as expected.
(BZ#1110219)

* Previously, the QEMU migration code did not account for the gaps caused by hot unplugged devices and thus expected more memory to be transferred during migrations. As a consequence, guest migration failed to complete after multiple devices were hot unplugged. In addition, the migration info text displayed erroneous values for the 'remaining ram' item. With this update, QEMU calculates memory after a device has been unplugged correctly, and any subsequent guest migrations proceed as expected. (BZ#1110189)

All qemu-kvm users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. After installing this update, shut down all running virtual machines. Once all virtual machines have shut down, start them again for this update to take effect.

From Red Hat Security Advisory 2014:0927 :

Updated qemu-kvm packages that fix multiple security issues and various bugs are now available for Red Hat Enterprise Linux 7.

The Red Hat Security Response Team has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux on AMD64 and Intel 64 systems. The qemu-kvm package provides the user-space component for running virtual machines using KVM.

Two integer overflow flaws were found in the QEMU block driver for QCOW version 1 disk images. A user able to alter the QEMU disk image files loaded by a guest could use either of these flaws to corrupt QEMU process memory on the host, which could potentially result in arbitrary code execution on the host with the privileges of the QEMU process. (CVE-2014-0222, CVE-2014-0223)

Multiple buffer overflow, input validation, and out-of-bounds write flaws were found in the way virtio, virtio-net, virtio-scsi, usb, and hpet drivers of QEMU handled state loading after migration. A user able to alter the savevm data (either on the disk or over the wire during migration) could use either of these flaws to corrupt QEMU process memory on the (destination) host, which could potentially result in arbitrary code execution on the host with the privileges of the QEMU process. (CVE-2013-4148, CVE-2013-4149, CVE-2013-4150, CVE-2013-4151, CVE-2013-4527, CVE-2013-4529, CVE-2013-4535, CVE-2013-4536, CVE-2013-4541, CVE-2013-4542, CVE-2013-6399, CVE-2014-0182, CVE-2014-3461)

These issues were discovered by Michael S. Tsirkin, Anthony Liguori and Michael Roth of Red Hat: CVE-2013-4148, CVE-2013-4149, CVE-2013-4150, CVE-2013-4151, CVE-2013-4527, CVE-2013-4529, CVE-2013-4535, CVE-2013-4536, CVE-2013-4541, CVE-2013-4542, CVE-2013-6399, CVE-2014-0182, and CVE-2014-3461.

This update also fixes the following bugs :

* Previously, QEMU did not free pre-allocated zero clusters correctly and the clusters under some circumstances leaked. With this update, pre-allocated zero clusters are freed appropriately and the cluster leaks no longer occur. (BZ#1110188)

* Prior to this update, the QEMU command interface did not properly handle resizing of cache memory during guest migration, causing QEMU to terminate unexpectedly with a segmentation fault and QEMU to fail.
This update fixes the related code and QEMU no longer crashes in the described situation. (BZ#1110191)

* Previously, when a guest device was hot unplugged, QEMU correctly removed the corresponding file descriptor watch but did not re-create it after the device was re-connected. As a consequence, the guest became unable to receive any data from the host over this device. With this update, the file descriptor's watch is re-created and the guest in the above scenario can communicate with the host as expected.
(BZ#1110219)

* Previously, the QEMU migration code did not account for the gaps caused by hot unplugged devices and thus expected more memory to be transferred during migrations. As a consequence, guest migration failed to complete after multiple devices were hot unplugged. In addition, the migration info text displayed erroneous values for the 'remaining ram' item. With this update, QEMU calculates memory after a device has been unplugged correctly, and any subsequent guest migrations proceed as expected. (BZ#1110189)

All qemu-kvm users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. After installing this update, shut down all running virtual machines. Once all virtual machines have shut down, start them again for this update to take effect.

- QCOW1 validation CVEs: CVE-2014-0222, CVE-2014-0223 (bz     #1097232, bz #1097238, bz #1097222, bz #1097216)

    - CVE-2014-3461: Issues in USB post load checks (bz       #1097260, bz #1096821)

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
83854	SUSE SLES11 Security Update : KVM (SUSE-SU-2015:0929-1) (Venom)	Nessus	SuSE Local Security Checks	high
81944	Mandriva Linux Security Advisory : qemu (MDVSA-2015:061)	Nessus	Mandriva Local Security Checks	high
79407	Mandriva Linux Security Advisory : qemu (MDVSA-2014:220)	Nessus	Mandriva Local Security Checks	high
79048	RHEL 6 : rhev-hypervisor6 (RHSA-2014:1168)	Nessus	Red Hat Local Security Checks	high
79041	RHEL 6 : qemu-kvm-rhev (RHSA-2014:1076)	Nessus	Red Hat Local Security Checks	high
78105	SuSE 11.3 Security Update : kvm (SAT Patch Number 9739)	Nessus	SuSE Local Security Checks	high
78046	Debian DSA-3045-1 : qemu - security update	Nessus	Debian Local Security Checks	high
78045	Debian DSA-3044-1 : qemu-kvm - security update	Nessus	Debian Local Security Checks	high
77570	Ubuntu 14.04 LTS : QEMU vulnerabilities (USN-2342-1)	Nessus	Ubuntu Local Security Checks	high
77461	GLSA-201408-17 : QEMU: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	high
77286	CentOS 6 : qemu-kvm (CESA-2014:1075)	Nessus	CentOS Local Security Checks	high
77272	Scientific Linux Security Update : qemu-kvm on SL6.x i386/x86_64 (20140819)	Nessus	Scientific Linux Local Security Checks	high
77271	RHEL 6 : qemu-kvm (RHSA-2014:1075)	Nessus	Red Hat Local Security Checks	high
77270	Oracle Linux 6 : qemu-kvm (ELSA-2014-1075)	Nessus	Oracle Linux Local Security Checks	high
76907	RHEL 7 : qemu-kvm (RHSA-2014:0927)	Nessus	Red Hat Local Security Checks	high
76839	CentOS 7 : qemu-kvm (CESA-2014:0927)	Nessus	CentOS Local Security Checks	high
76748	Oracle Linux 7 : qemu-kvm (ELSA-2014-0927)	Nessus	Oracle Linux Local Security Checks	high
74414	Fedora 20 : qemu-1.6.2-6.fc20 (2014-6970)	Nessus	Fedora Local Security Checks	high

Detections

Analytics

CVE-2014-0223

high

Tenable Plugins

high

high

high

high

high

high

high

high

high

high

high

high

high

high

high

high

high

high