Debian Security Advisory

DLA-573-1 qemu -- LTS security update

Date Reported:
30 Jul 2016
Affected Packages:
qemu
Vulnerable:
Yes
Security database references:
In Mitre's CVE dictionary: CVE-2015-5239, CVE-2016-2857, CVE-2016-4020, CVE-2016-4439, CVE-2016-5403, CVE-2016-6351.
More information:

Multiple vulnerabilities have been discovered in QEMU, a fast processor emulator. The Common Vulnerabilities and Exposures project identifies the following problems:

  • CVE-2015-5239

    Lian Yihan discovered that QEMU incorrectly handled certain payload messages in the VNC display driver. A malicious guest could use this issue to cause the QEMU process to hang, resulting in a denial of service.

  • CVE-2016-2857

    Ling Liu discovered that QEMU incorrectly handled IP checksum routines. An attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service, or possibly leak host memory bytes.

  • CVE-2016-4020

    Donghai Zdh discovered that QEMU incorrectly handled the Task Priority Register(TPR). A privileged attacker inside the guest could use this issue to possibly leak host memory bytes.

  • CVE-2016-4439

    , CVE-2016-6351

    Li Qiang disovered that the emulation of the 53C9X Fast SCSI Controller is affected by out of bound access issues.

  • CVE-2016-5403

    Zhenhao Hong discovered that a malicious guest administrator can cause unbounded memory allocation in QEMU (which can cause an Out-of-Memory condition) by submitting virtio requests without bothering to wait for completion.

For Debian 7 Wheezy, these problems have been fixed in version 1.1.2+dfsg-6+deb7u14.

We recommend that you upgrade your qemu packages.

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS