Qemu before 1.6.2 block diver for the various disk image formats used by Bochs and for the QCOW version 2 format, are vulnerable to a possible crash caused by signed data types or a logic error while creating QCOW2 snapshots, which leads to incorrectly calling update_refcount() routine.

The remote Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2014:0434 advisory.

    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 Linux OpenStack Platform.

    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)

    The CVE-2014-0143 issues were discovered by Kevin Wolf and Stefan Hajnoczi     of Red Hat, the CVE-2014-0144 issues were discovered by Fam Zheng, Jeff     Cody, Kevin Wolf, and Stefan Hajnoczi of Red Hat, the CVE-2014-0145 issues     were discovered by Stefan Hajnoczi of Red Hat, the CVE-2014-0150 issue was     discovered by Michael S. Tsirkin of Red Hat, the CVE-2014-0142,     CVE-2014-0146, and CVE-2014-0147 issues were discovered by Kevin Wolf of     Red Hat, and the CVE-2014-0148 issue was discovered by Jeff Cody of     Red Hat.

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 5 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - qemu: insufficient parameter validation during ram load (CVE-2014-7840)

  - Qemu: net: buffer overflow in MIPSnet emulator (CVE-2016-4002)

  - The KVM subsystem in the Linux kernel before 3.0 does not check whether kernel addresses are specified     during allocation of memory slots for use in a guest's physical address space, which allows local users to     gain privileges or obtain sensitive information from kernel memory via a crafted application, related to     arch/x86/kvm/paging_tmpl.h and virt/kvm/kvm_main.c. (CVE-2013-1943)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

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.

Updated rhev-hypervisor6 packages that fix multiple security issues, several bugs, and add various enhancements are now available.

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.

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.

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)

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 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)

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)

The CVE-2014-0143 issues were discovered by Kevin Wolf and Stefan Hajnoczi of Red Hat, the CVE-2014-0144 issues were discovered by Fam Zheng, Jeff Cody, Kevin Wolf, and Stefan Hajnoczi of Red Hat, the CVE-2014-0145 issues were discovered by Stefan Hajnoczi of Red Hat, the CVE-2014-0150 issue was discovered by Michael S. Tsirkin of Red Hat, the CVE-2014-0142, CVE-2014-0146, and CVE-2014-0147 issues were discovered by Kevin Wolf of Red Hat, the CVE-2014-0148 issue was discovered by Jeff Cody of Red Hat, and the CVE-2013-4148, CVE-2013-4151, CVE-2013-4535, CVE-2013-4536, CVE-2013-4541, CVE-2013-4542, CVE-2013-6399, CVE-2014-0182, and CVE-2014-3461 issues were discovered by Michael S. Tsirkin of Red Hat, Anthony Liguori, and Michael Roth.

Other changes to the rhev-hypervisor6 component :

* The most recent builds of rhn-virtualization-common and rhn-virtualization-host are included in version 3.4.0. (BZ#1095812)

All users of qemu-kvm-rhev are advised to upgrade to these updated packages, which contain backported patches to correct these issues and add these enhancements. 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.

The remote Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2014:0421 advisory.

    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.

    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)

    The CVE-2014-0143 issues were discovered by Kevin Wolf and Stefan Hajnoczi     of Red Hat, the CVE-2014-0144 issues were discovered by Fam Zheng, Jeff     Cody, Kevin Wolf, and Stefan Hajnoczi of Red Hat, the CVE-2014-0145 issues     were discovered by Stefan Hajnoczi of Red Hat, the CVE-2014-0150 issue was     discovered by Michael S. Tsirkin of Red Hat, the CVE-2014-0142,     CVE-2014-0146, and CVE-2014-0147 issues were discovered by Kevin Wolf of     Red Hat, and the CVE-2014-0148 issue was discovered by Jeff Cody of     Red Hat.

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

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

The remote Ubuntu 14.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-2342-1 advisory.

    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)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

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.

The QEMU embedded within KVM received various security fixes.

Various issues in the block layer have been fixed :

  - A virtio security issue in config io space handling.
    (CVE-2013-2016)

  - A SCSI report LUNs buffer overflow. (CVE-2013-4344)

  - A buffer overflow in the QEMU USB stack. (CVE-2013-4541)

- Fix arm sd warnings with latest kernel (bz #1091548)

    - Fix regression in CVE backport that affects openstack       (thanks lbezdick)

    - Fix guest startup crashes from autotest (bz #1081610)

    - Block/image format validation CVE-2014-0142 -       2014-0148 (bz #1078201, bz #1086710, bz #1079140, bz       #1086724, bz #1079240, bz #1086735, bz #1078885, bz       #1086720, bz #1078232, bz #1086713, bz #1078848, bz       #1086717, bz #1078212, bz #1086712)

    - CVE-2014-0150: virtio-net: buffer overflow in       virtio_net_handle_mac() function (bz #1086775, bz       #1078846)

    - CVE-2013-4544: vmxnet3: bounds checking buffer overrun       (bz #1087513, bz #1087522)

    - CVE-2014-2894: out of bounds buffer accesses, guest       triggerable via IDE SMART (bz #1087981, bz #1087971)

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.

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)

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 are now available for Red Hat Enterprise Linux 6.

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.

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)

The CVE-2014-0143 issues were discovered by Kevin Wolf and Stefan Hajnoczi of Red Hat, the CVE-2014-0144 issues were discovered by Fam Zheng, Jeff Cody, Kevin Wolf, and Stefan Hajnoczi of Red Hat, the CVE-2014-0145 issues were discovered by Stefan Hajnoczi of Red Hat, the CVE-2014-0150 issue was discovered by Michael S. Tsirkin of Red Hat, the CVE-2014-0142, CVE-2014-0146, and CVE-2014-0147 issues were discovered by Kevin Wolf of Red Hat, and the CVE-2014-0148 issue was discovered by Jeff Cody of Red Hat.

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.

The remote Oracle Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2014-0420 advisory.

    - kvm-qcow2-Check-backing_file_offset-CVE-2014-0144.patch [bz#1079452 bz#1079453]
    - kvm-qcow2-Check-refcount-table-size-CVE-2014-0144.patch [bz#1079452 bz#1079453]
    - kvm-qcow2-Fix-new-L1-table-size-check-CVE-2014-0143.patch [bz#1079318 bz#1079319]
    - kvm-bochs-Check-catalog_size-header-field-CVE-2014-0143.patch [bz#1079318 bz#1079319]
    - kvm-bochs-Check-extent_size-header-field-CVE-2014-0142.patch [bz#1079313 bz#1079314]
    - kvm-vpc-Validate-block-size-CVE-2014-0142.patch [bz#1079313 bz#1079314]
    - kvm-dmg-prevent-chunk-buffer-overflow-CVE-2014-0145.patch [bz#1079323 bz#1079324]
    - kvm-block-Limit-request-size-CVE-2014-0143.patch [bz#1079318 bz#1079319]
    - kvm-parallels-Sanity-check-for-s-tracks-CVE-2014-0142.patch [bz#1079313 bz#1079314]
    - Resolves: bz#1078849       (EMBARGOED CVE-2014-0150 qemu-kvm: qemu: virtio-net: buffer overflow in virtio_net_handle_mac() function     [rhel-6.5.z])
    - Resolves: bz#1079313       (CVE-2014-0142 qemu-kvm: qemu: crash by possible division by zero [rhel-6.5.z])
    - Resolves: bz#1079318       (CVE-2014-0143 qemu-kvm: Qemu: block: multiple integer overflow flaws [rhel-6.5.z])
    - Resolves: bz#1079323       (CVE-2014-0145 qemu-kvm: Qemu: prevent possible buffer overflows [rhel-6.5.z])
    - Resolves: bz#1079330       (CVE-2014-0146 qemu-kvm: Qemu: qcow2: NULL dereference in qcow2_open() error path [rhel-6.5.z])
    - Resolves: bz#1079337       (CVE-2014-0147 qemu-kvm: Qemu: block: possible crash due signed types or logic error [rhel-6.5.z])
    - Resolves: bz#1079343       (CVE-2014-0148 qemu-kvm: Qemu: vhdx: bounds checking for block_size and logical_sector_size     [rhel-6.5.z])
    - Resolves: bz#1079452       (CVE-2014-0144 qemu-kvm: Qemu: block: missing input validation [rhel-6.5.z])

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
210182	RHEL 6 : qemu-kvm-rhev (RHSA-2014:0434)	Nessus	Red Hat Local Security Checks	high
199962	RHEL 5 : kvm (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	critical
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
79029	RHEL 6 : rhev-hypervisor6 3.4.0 (RHSA-2014:0674)	Nessus	Red Hat Local Security Checks	high
79015	RHEL 6 : qemu-kvm-rhev (RHSA-2014:0421)	Nessus	Red Hat 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
73939	SuSE 11.3 Security Update : kvm (SAT Patch Number 9142)	Nessus	SuSE Local Security Checks	high
73818	Fedora 20 : qemu-1.6.2-4.fc20 (2014-5825)	Nessus	Fedora Local Security Checks	high
73664	Scientific Linux Security Update : qemu-kvm on SL6.x i386/x86_64 (20140422)	Nessus	Scientific Linux Local Security Checks	high
73663	RHEL 6 : qemu-kvm (RHSA-2014:0420)	Nessus	Red Hat Local Security Checks	high
73662	Oracle Linux 6 : qemu-kvm (ELSA-2014-0420)	Nessus	Oracle Linux Local Security Checks	high
73656	CentOS 6 : qemu-kvm (CESA-2014:0420)	Nessus	CentOS Local Security Checks	high

Detections

Analytics

CVE-2014-0147

medium

Tenable Plugins

high

critical

high

high

high

high

high

high

high

high

high

high

high

high

high

high