Debian Security Advisory

DLA-939-1 qemu-kvm -- LTS security update

Date Reported:
11 May 2017
Affected Packages:
qemu-kvm
Vulnerable:
Yes
Security database references:
In Mitre's CVE dictionary: CVE-2016-9603, CVE-2017-7718, CVE-2017-7980.
More information:

Multiple vulnerabilities have been discovered in qemu-kvm, a full virtualization solution on x86 hardware based on Quick Emulator(Qemu). The Common Vulnerabilities and Exposures project identifies the following problems:

  • CVE-2016-9603

    qemu-kvm built with the Cirrus CLGD 54xx VGA Emulator and the VNC display driver support is vulnerable to a heap buffer overflow issue. It could occur when Vnc client attempts to update its display after a vga operation is performed by a guest.

    A privileged user/process inside guest could use this flaw to crash the Qemu process resulting in DoS OR potentially leverage it to execute arbitrary code on the host with privileges of the Qemu process.

  • CVE-2017-7718

    qemu-kvm built with the Cirrus CLGD 54xx VGA Emulator support is vulnerable to an out-of-bounds access issue. It could occur while copying VGA data via bitblt functions cirrus_bitblt_rop_fwd_transp_ and/or cirrus_bitblt_rop_fwd_.

    A privileged user inside guest could use this flaw to crash the Qemu process resulting in DoS.

  • CVE-2017-7980

    qemu-kvm built with the Cirrus CLGD 54xx VGA Emulator support is vulnerable to an out-of-bounds r/w access issues. It could occur while copying VGA data via various bitblt functions.

    A privileged user inside guest could use this flaw to crash the Qemu process resulting in DoS OR potentially execute arbitrary code on a host with privileges of Qemu process on the host.

For Debian 7 Wheezy, these problems have been fixed in version 1.1.2+dfsg-6+deb7u21.

We recommend that you upgrade your qemu-kvm 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