The virtqueue_map_sg function in hw/virtio/virtio.c in QEMU before 1.7.2 allows remote attackers to execute arbitrary files via a crafted savevm image, related to virtio-block or virtio-serial read.

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 qemu-kvm-rhev packages that fix several security issues are now available for Red Hat Enterprise Virtualization.

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-rhev package provides the user-space component for running virtual machines using KVM in environments managed by Red Hat Enterprise Virtualization Manager.

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)

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.

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.

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 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.

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.

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2014-0927 advisory.

    - Resolves: bz#1095782       (CVE-2014-0182 qemu-kvm: qemu: virtio: out-of-bounds buffer write on state load with invalid config_len     [rhel-7.0.z])
    - kvm-qcow1-Validate-L2-table-size-CVE-2014-0222.patch [bz#1097229]
    - kvm-qcow1-Validate-image-size-CVE-2014-0223.patch [bz#1097236]
    - Resolves: bz#1095677       (CVE-2013-4148 qemu-kvm: qemu: virtio-net: buffer overflow on invalid state load [rhel-7.0.z])
    - Resolves: bz#1095684       (CVE-2013-4149 qemu-kvm: qemu: virtio-net: out-of-bounds buffer write on load [rhel-7.0.z])
    - Resolves: bz#1095689       (CVE-2013-4150 qemu-kvm: qemu: virtio-net: out-of-bounds buffer write on invalid state load     [rhel-7.0.z])
    - Resolves: bz#1095694       (CVE-2013-4151 qemu-kvm: qemu: virtio: out-of-bounds buffer write on invalid state load [rhel-7.0.z])
    - Resolves: bz#1095706       (CVE-2013-4527 qemu-kvm: qemu: hpet: buffer overrun on invalid state load [rhel-7.0.z])
    - Resolves: bz#1095714       (CVE-2013-4529 qemu-kvm: qemu: hw/pci/pcie_aer.c: buffer overrun on invalid state load [rhel-7.0.z])
    - Resolves: bz#1095737       (CVE-2013-6399 qemu-kvm: qemu: virtio: buffer overrun on incoming migration [rhel-7.0.z])
    - Resolves: bz#1095741       (CVE-2013-4542 qemu-kvm: qemu: virtio-scsi: buffer overrun on invalid state load [rhel-7.0.z])
    - Resolves: bz#1095746       (CVE-2013-4541 qemu-kvm: qemu: usb: insufficient sanity checking of setup_index+setup_len in post_load     [rhel-7.0.z])
    - Resolves: bz#1095765       (CVE-2013-4535 CVE-2013-4536 qemu-kvm: qemu: virtio: insufficient validation of num_sg when mapping     [rhel-7.0.z])
    - Resolves: bz#1095782       (CVE-2014-0182 qemu-kvm: qemu: virtio: out-of-bounds buffer write on state load with invalid config_len     [rhel-7.0.z])
    - Resolves: bz#1096828       (CVE-2014-3461 qemu-kvm: Qemu: usb: fix up post load checks [rhel-7.0.z])
    - Resolves: bz#1097229       (CVE-2014-0222 qemu-kvm: Qemu: qcow1: validate L2 table size to avoid integer overflows [rhel-7.0.z])
    - Resolves: bz#1097236       (CVE-2014-0223 qemu-kvm: Qemu: qcow1: validate image size to avoid out-of-bounds memory access     [rhel-7.0.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.

Several security issues in KVM have been fixed. Some issues could have resulted in arbitrary code execution or crash of the kvm host.

  - virtio-net: buffer overflow in virtio_net_handle_mac()     function. (CVE-2014-0150)

  - Fixed out of bounds buffer accesses, guest triggerable     via IDE SMART. (CVE-2014-2894)

  - Fixed various virtio-net buffer overflows.
    (CVE-2013-4148 / CVE-2013-4149 / CVE-2013-4150 /     CVE-2013-4151)

  - Fixed ahci buffer overrun. (CVE-2013-4526)

  - Fixed hpet buffer overrun. (CVE-2013-4527)

  - Fixed a PCIE-AER buffer overrun. (CVE-2013-4529)

  - Fixed a buffer overrun in pl022. (CVE-2013-4530)

  - Fixed a vmstate buffer overflow. (CVE-2013-4531)

  - Fixed a pxa2xx buffer overrun. (CVE-2013-4533)

  - Fixed a openpic buffer overrun. (CVE-2013-4534)

  - Validate virtio num_sg mapping. (CVE-2013-4535 /     CVE-2013-4536)

  - Fixed ssi-sd buffer overrun. (CVE-2013-4537)

  - Fixed ssd0323 buffer overrun. (CVE-2013-4538)

  - Fixed tsc210x buffer overrun. (CVE-2013-4539)

  - Fixed Zaurus buffer overrun. (CVE-2013-4540)

  - Some USB sanity checking added. (CVE-2013-4541)

  - Fixed virtio scsi buffer overrun. (CVE-2013-4542)

  - Fixed another virtio buffer overrun. (CVE-2013-6399)

  - Validate config_len on load in virtio (CVE-2014-0182)

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)

This update also fixes the following bugs :

  - Previously, under certain circumstances, libvirt failed     to start guests which used a non-zero PCI domain and     SR-IOV Virtual Functions (VFs), and returned the     following error message :

Can't assign device inside non-zero PCI segment as this KVM module doesn't support it.

This update fixes this issue and guests using the aforementioned configuration no longer fail to start.

  - Due to an incorrect initialization of the cpus_sts     bitmap, which holds the enablement status of a vCPU,     libvirt could fail to start a guest with an unusual vCPU     topology (for example, a guest with three cores and two     sockets). With this update, the initialization of     cpus_sts has been corrected, and libvirt no longer fails     to start the aforementioned guests.

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 two bugs 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 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)

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.

This update also fixes the following bugs :

* Previously, under certain circumstances, libvirt failed to start guests which used a non-zero PCI domain and SR-IOV Virtual Functions (VFs), and returned the following error message :

Can't assign device inside non-zero PCI segment as this KVM module doesn't support it.

This update fixes this issue and guests using the aforementioned configuration no longer fail to start. (BZ#1099941)

* Due to an incorrect initialization of the cpus_sts bitmap, which holds the enablement status of a vCPU, libvirt could fail to start a guest with an unusual vCPU topology (for example, a guest with three cores and two sockets). With this update, the initialization of cpus_sts has been corrected, and libvirt no longer fails to start the aforementioned guests. (BZ#1100575)

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-2014-0743 advisory.

    [0.12.1.2-2.415.el6_5.10]
    - kvm-virtio-out-of-bounds-buffer-write-on-invalid-state-l.patch [bz#1095692]
    - kvm-usb-sanity-check-setup_index-setup_len-in-post_load.patch [bz#1095743]
    - kvm-usb-sanity-check-setup_index-setup_len-in-post_load-2.patch [bz#1095743]
    - kvm-virtio-scsi-fix-buffer-overrun-on-invalid-state-load.patch [bz#1095739]
    - kvm-virtio-avoid-buffer-overrun-on-incoming-migration.patch [bz#1095735]
    - kvm-virtio-validate-num_sg-when-mapping.patch [bz#1095763 bz#1096124]
    - kvm-virtio-allow-mapping-up-to-max-queue-size.patch [bz#1095763 bz#1096124]
    - kvm-enable-PCI-multiple-segments-for-pass-through-device.patch [bz#1099941]
    - kvm-virtio-net-fix-buffer-overflow-on-invalid-state-load.patch [bz#1095675]
    - kvm-virtio-validate-config_len-on-load.patch [bz#1095779]
    - kvm-usb-fix-up-post-load-checks.patch [bz#1096825]
    - kvm-CPU-hotplug-use-apic_id_for_cpu-round-2-RHEL-6-only.patch [bz#1100575]
    - Resolves: bz#1095675       ()
    - Resolves: bz#1095692       ()
    - Resolves: bz#1095735       ()
    - Resolves: bz#1095739       ()
    - Resolves: bz#1095743       ()
    - Resolves: bz#1095763       ()
    - Resolves: bz#1095779       ()
    - Resolves: bz#1096124       ()
    - Resolves: bz#1096825       ()
    - Resolves: bz#1099941       ()
    - Resolves: bz#1100575       (Some vCPU topologies not accepted by libvirt)

    [0.12.1.2-2.415.el6_5.9]
    - kvm-ide-Correct-improper-smart-self-test-counter-reset-i.patch [bz#1087978]
    - Resolves: bz#1087978       (CVE-2014-2894 qemu-kvm: QEMU: out of bounds buffer accesses, guest triggerable via IDE SMART     [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.

- Migration CVEs: CVE-2014-0182 etc.

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
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
79030	RHEL 6 : qemu-kvm-rhev (RHSA-2014:0744)	Nessus	Red Hat Local Security Checks	high
79029	RHEL 6 : rhev-hypervisor6 3.4.0 (RHSA-2014:0674)	Nessus	Red Hat Local Security Checks	high
77570	Ubuntu 14.04 LTS : QEMU vulnerabilities (USN-2342-1)	Nessus	Ubuntu 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
76138	SuSE 11.3 Security Update : KVM (SAT Patch Number 9302)	Nessus	SuSE Local Security Checks	high
74490	Scientific Linux Security Update : qemu-kvm on SL6.x i386/x86_64 (20140610)	Nessus	Scientific Linux Local Security Checks	high
74474	CentOS 6 : qemu-kvm (CESA-2014:0743)	Nessus	CentOS Local Security Checks	high
74461	RHEL 6 : qemu-kvm (RHSA-2014:0743)	Nessus	Red Hat Local Security Checks	high
74457	Oracle Linux 6 : qemu-kvm (ELSA-2014-0743)	Nessus	Oracle Linux Local Security Checks	high
74047	Fedora 20 : qemu-1.6.2-5.fc20 (2014-6288)	Nessus	Fedora Local Security Checks	high

Detections

Analytics

CVE-2013-4535

high

Tenable Plugins

critical

high

high

high

high

high

high

high

high

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high