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Vulnerability of QEMU: directory traversal via SLiRP TFTP Server

Synthesis of the vulnerability 

An attacker can traverse directories via SLiRP TFTP Server of QEMU, in order to read a file outside the service root path.
Impacted systems: QEMU, SUSE Linux Enterprise Desktop, SLES.
Severity of this alert: 2/4.
Creation date: 17/01/2020.
Références of this alert: CVE-2020-7211, SUSE-SU-2020:0334-1, SUSE-SU-2020:0388-1, SUSE-SU-2020:1138-1, SUSE-SU-2020:1139-1, SUSE-SU-2020:14444-1, SUSE-SU-2020:14448-1, SUSE-SU-2020:1630-1, VIGILANCE-VUL-31355.

Description of the vulnerability 

An attacker can traverse directories via SLiRP TFTP Server of QEMU, in order to read a file outside the service root path.
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This computer threat bulletin impacts software or systems such as QEMU, SUSE Linux Enterprise Desktop, SLES.

Our Vigil@nce team determined that the severity of this security threat is medium.

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

An attacker with a expert ability can exploit this computer vulnerability alert.

Solutions for this threat 

QEMU: patch for SLiRP TFTP Server.
A patch is available:
  https://gitlab.freedesktop.org/slirp/libslirp/commit/14ec36e107a8c9af7d0a80c3571fe39b291ff1d4

SUSE LE 11 SP3: new xen packages.
New packages are available:
  SUSE LE 11 SP3: xen 4.2.5_22-45.36.1

SUSE LE 12 SP1: new xen packages.
New packages are available:
  SUSE LE 12 SP1: xen 4.5.5_28-22.64.1

SUSE LE 12 SP2: new xen packages.
New packages are available:
  SUSE LE 12 SP2: xen 4.7.6_06-43.59.1

SUSE LE 12 SP3: new xen packages (17/06/2020).
New packages are available:
  SUSE LE 12 SP3: xen 4.9.4_06-3.62.1

SUSE LE 12 SP4: new xen packages (05/08/2020).
New packages are available:
  SUSE LE 11 SP4: xen 4.4.4_42-61.52.1

SUSE LE 12 SP4, SP5: new xen packages.
New packages are available:
  SUSE LE 12 SP4: xen 4.11.3_04-2.23.1
  SUSE LE 12 SP5: xen 4.12.2_04-3.11.1

Wind River Linux: version 10.19.45.8.
The version 10.19.45.8 is fixed.
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