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Vulnerability of Xen: buffer overflow of MSI-X

Synthesis of the vulnerability 

An attacker, who is administrator in a guest system, can generate a buffer overflow in MSI-X of Xen, in order to trigger a denial of service, and possibly to run code on the host system.
Vulnerable software: XenServer, Debian, Fedora, openSUSE, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Xen.
Severity of this announce: 1/4.
Creation date: 17/12/2015.
Références of this computer vulnerability: CERTFR-2015-AVI-551, CERTFR-2015-AVI-556, CTX203879, CVE-2015-8554, DLA-479-1, FEDORA-2015-c44bd3e0fa, FEDORA-2015-d8253e2b1d, openSUSE-SU-2016:0123-1, openSUSE-SU-2016:0124-1, openSUSE-SU-2016:0126-1, SUSE-SU-2016:0873-1, SUSE-SU-2016:0955-1, SUSE-SU-2016:1154-1, SUSE-SU-2016:1318-1, SUSE-SU-2016:1745-1, VIGILANCE-VUL-18553, XSA-164.

Description of the vulnerability 

The Xen product can be configured with "qemu-xen-traditional" (qemu-dm).

However, if the size of MSI-X data is greater than the size of the storage array, an overflow occurs.

An attacker, who is administrator in a guest system, can therefore generate a buffer overflow in MSI-X of Xen, in order to trigger a denial of service, and possibly to run code on the host system.
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This threat impacts software or systems such as XenServer, Debian, Fedora, openSUSE, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Xen.

Our Vigil@nce team determined that the severity of this computer threat is low.

The trust level is of type confirmed by the editor, with an origin of privileged shell.

An attacker with a expert ability can exploit this cybersecurity bulletin.

Solutions for this threat 

Xen: patch for MSI-X.
A patch is indicated in information sources.

Citrix XenServer: patch.
A patch is indicated in information sources.

Debian 7: new xen packages.
New packages are available:
  Debian 7: xen 4.1.6.1-1+deb7u1

Fedora: new xen packages.
New packages are available:
  Fedora 22: xen 4.5.2-6.fc22
  Fedora 23: xen 4.5.2-6.fc23

openSUSE 13.1: new xen packages (15/01/2016).
New packages are available:
  openSUSE 13.1: xen 4.3.4_10-53.1

openSUSE 13.2: new xen packages (15/01/2016).
New packages are available:
  openSUSE 13.2: xen 4.4.3_08-36.1

openSUSE Leap 42.1: new xen packages (15/01/2016).
New packages are available:
  openSUSE Leap 42.1: xen 4.5.2_04-9.2

SUSE LE 11 SP2: new xen packages (27/04/2016).
New packages are available:
  SUSE LE 11 SP2: xen 4.1.6_08-26.1

SUSE LE 11 SP3: new xen packages (06/07/2016).
New packages are available:
  SUSE LE 11 SP3: xen-kmp-default 4.2.5_20_3.0.101_0.47.79-24.9, xen-libs 4.2.5_20-24.9, xen-tools-domU 4.2.5_20-24.9

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 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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