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Vulnerability of Qemu: denial of service via websocket

Synthesis of the vulnerability 

A remote attacker can use the VNC websocket of Qemu, in order to trigger a denial of service.
Vulnerable software: Debian, Fedora, openSUSE, openSUSE Leap, RHEL, SUSE Linux Enterprise Desktop, SLES, Unix (platform) ~ not comprehensive.
Severity of this announce: 2/4.
Creation date: 24/03/2015.
Références of this computer vulnerability: CVE-2015-1779, DSA-3259-1, FEDORA-2015-5482, MDVSA-2015:210, openSUSE-SU-2016:0914-1, openSUSE-SU-2016:0995-1, RHSA-2015:1943-01, SUSE-SU-2015:0870-1, SUSE-SU-2015:0896-1, SUSE-SU-2016:0873-1, SUSE-SU-2016:0955-1, SUSE-SU-2016:1318-1, SUSE-SU-2021:14704-1, SUSE-SU-2021:14706-1, VIGILANCE-VUL-16453.

Description of the vulnerability 

The Qemu product implements the VNC protocol with websockets.

However, the ui/vnc-ws.c file does not limit the quantity of resources requested by the client before its authentication.

A remote attacker can therefore use the VNC websocket of Qemu, in order to trigger a denial of service.
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This weakness announce impacts software or systems such as Debian, Fedora, openSUSE, openSUSE Leap, RHEL, SUSE Linux Enterprise Desktop, SLES, Unix (platform) ~ not comprehensive.

Our Vigil@nce team determined that the severity of this vulnerability alert is medium.

The trust level is of type confirmed by the editor, with an origin of intranet client.

An attacker with a expert ability can exploit this computer threat announce.

Solutions for this threat 

Qemu: patch for websocket.
A patch is available in information sources.

Debian: new qemu packages.
New packages are available:
  Debian 7: qemu 1.1.2+dfsg-6a+deb7u7, qemu-kvm 1.1.2+dfsg-6+deb7u7
  Debian 8: qemu 1:2.1+dfsg-12

Fedora 21: new qemu packages.
New packages are available:
  Fedora 21: qemu 2.1.3-5.fc21

Mandriva: new qemu packages.
New packages are available:
  Mandriva BS1: qemu 1.6.2-1.3.mbs1
  Mandriva BS2: qemu 1.6.2-1.1.mbs2

openSUSE 13.2: new xen packages (11/04/2016).
New packages are available:
  openSUSE 13.2: xen 4.4.4_02-43.1

openSUSE Leap 42.1: new xen packages (31/03/2016).
New packages are available:
  openSUSE Leap 42.1: xen 4.5.2_06-12.1

RHEL 7.1: new qemu-kvm packages.
New packages are available:
  RHEL 7: qemu-kvm 1.5.3-86.el7_1.8

SUSE LE 11: new kvm packages.
New packages are available:
  SUSE LE 11: kvm 1.4.2-0.22.25.1

SUSE LE 11 SP3: new kvm packages.
New packages are available:
  SUSE LE 11 SP3: kvm 1.4.2-53.38.1

SUSE LE 11 SP4: new kvm packages.
New packages are available:
  SUSE LE 11 SP4: kvm 1.4.2-60.34.1

SUSE LE 11 SP4: new xen packages (05/04/2016).
New packages are available:
  SUSE LE 11 SP4: xen 4.4.4_02-32.1

SUSE LE 12: new qemu packages.
New packages are available:
  SUSE LE 12: qemu 2.0.2-46.1

SUSE LE 12: new xen packages.
New packages are available:
  SUSE LE 12 RTM: xen 4.4.4_02-22.19.1

SUSE LE 12 SP1: new xen packages.
New packages are available:
  SUSE LE 12 SP1: xen 4.5.2_06-7.1
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