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USN-2724-1: QEMU vulnerabilities

27 August 2015

Several security issues were fixed in QEMU.

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Releases

Packages

  • qemu - Machine emulator and virtualizer
  • qemu-kvm - Machine emulator and virtualizer

Details

It was discovered that QEMU incorrectly handled a PRDT with zero complete
sectors in the IDE functionality. A malicious guest could possibly use
this issue to cause a denial of service. This issue only affected Ubuntu
12.04 LTS and Ubuntu 14.04 LTS. (CVE-2014-9718)

Donghai Zhu discovered that QEMU incorrectly handled the RTL8139 driver.
A malicious guest could possibly use this issue to read sensitive
information from arbitrary host memory. (CVE-2015-5165)

Donghai Zhu discovered that QEMU incorrectly handled unplugging emulated
block devices. A malicious guest could use this issue to cause a denial of
service, or possibly execute arbitrary code on the host as the user running
the QEMU process. In the default installation, when QEMU is used with
libvirt, attackers would be isolated by the libvirt AppArmor profile. This
issue only affected Ubuntu 15.04. (CVE-2015-5166)

Qinghao Tang and Mr. Zuozhi discovered that QEMU incorrectly handled memory
in the VNC display driver. A malicious guest could use this issue to cause
a denial of service, or possibly execute arbitrary code on the host as the
user running the QEMU process. In the default installation, when QEMU is
used with libvirt, attackers would be isolated by the libvirt AppArmor
profile. This issue only affected Ubuntu 15.04. (CVE-2015-5225)

It was discovered that QEMU incorrectly handled the virtio-serial device.
A malicious guest could use this issue to cause a denial of service, or
possibly execute arbitrary code on the host as the user running the QEMU
process. In the default installation, when QEMU is used with libvirt,
attackers would be isolated by the libvirt AppArmor profile. This issue
only affected Ubuntu 14.04 LTS and Ubuntu 15.04. (CVE-2015-5745)

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Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

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Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 15.04
Ubuntu 14.04
Ubuntu 12.04

After a standard system update you need to restart all QEMU virtual
machines to make all the necessary changes.

References

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Further reading