Ubuntu 15.10: USN-2828-1 Moderate Advisory for QEMU DoS Vulnerabilities

ubuntu

December 3, 2015

Several security issues were fixed in QEMU.

Summary

Several security issues were fixed in QEMU.

Software Description:

- qemu: Machine emulator and virtualizer

- qemu-kvm: Machine emulator and virtualizer

Details:

Jason Wang discovered that QEMU incorrectly handled the virtio-net device.

A remote attacker could use this issue to cause guest network consumption,

resulting in a denial of service. (CVE-2015-7295)

Qinghao Tang and Ling Liu discovered that QEMU incorrectly handled the

pcnet driver when used in loopback mode. 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. (CVE-2015-7504)

Ling Liu and Jason Wang discovered that QEMU incorrectly handled the

pcnet driver. A remote attacker could use this issue to cause a denial of

service, or possibly execute arbitrary code on the host as th...

Read the Full Advisory

Topics Covered

security advisory remote code execution Ubuntu DoS risks QEMU issues

Update Instructions

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

Ubuntu 15.10:
  qemu-system                     1:2.3+dfsg-5ubuntu9.1
  qemu-system-aarch64             1:2.3+dfsg-5ubuntu9.1
  qemu-system-arm                 1:2.3+dfsg-5ubuntu9.1
  qemu-system-mips                1:2.3+dfsg-5ubuntu9.1
  qemu-system-misc                1:2.3+dfsg-5ubuntu9.1
  qemu-system-ppc                 1:2.3+dfsg-5ubuntu9.1
  qemu-system-sparc               1:2.3+dfsg-5ubuntu9.1
  qemu-system-x86                 1:2.3+dfsg-5ubuntu9.1

Ubuntu 15.04:
  qemu-system                     1:2.2+dfsg-5expubuntu9.7
  qemu-system-aarch64             1:2.2+dfsg-5expubuntu9.7
  qemu-system-arm                 1:2.2+dfsg-5expubuntu9.7
  qemu-system-mips                1:2.2+dfsg-5expubuntu9.7
  qemu-system-misc                1:2.2+dfsg-5expubuntu9.7
  qemu-system-ppc                 1:2.2+dfsg-5expubuntu9.7
  qemu-system-sparc               1:2.2+dfsg-5expubuntu9.7
  qemu-system-x86                 1:2.2+dfsg-5expubuntu9.7

Ubuntu 14.04 LTS:
  qemu-system                     2.0.0+dfsg-2ubuntu1.21
  qemu-system-aarch64             2.0.0+dfsg-2ubuntu1.21
  qemu-system-arm                 2.0.0+dfsg-2ubuntu1.21
  qemu-system-mips                2.0.0+dfsg-2ubuntu1.21
  qemu-system-misc                2.0.0+dfsg-2ubuntu1.21
  qemu-system-ppc                 2.0.0+dfsg-2ubuntu1.21
  qemu-system-sparc               2.0.0+dfsg-2ubuntu1.21
  qemu-system-x86                 2.0.0+dfsg-2ubuntu1.21

Ubuntu 12.04 LTS:
  qemu-kvm                        1.0+noroms-0ubuntu14.26

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