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Vulnerability of Linux kernel: information disclosure via pptp_bind

Synthesis of the vulnerability 

A local attacker can read a memory fragment by calling the getsockname() function on a PPTP socket on the Linux kernel, in order to obtain sensitive information.
Impacted software: Debian, Fedora, Linux, openSUSE, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this computer vulnerability: 1/4.
Creation date: 16/12/2015.
Références of this announce: CERTFR-2016-AVI-004, CERTFR-2016-AVI-044, CERTFR-2016-AVI-069, CERTFR-2016-AVI-073, CERTFR-2016-AVI-110, CVE-2015-8569, DSA-3434-1, FEDORA-2016-5d43766e33, FEDORA-2016-6ce812a1e0, openSUSE-SU-2016:0280-1, openSUSE-SU-2016:0301-1, openSUSE-SU-2016:0318-1, openSUSE-SU-2016:2649-1, SUSE-SU-2016:0168-1, SUSE-SU-2016:0585-1, SUSE-SU-2016:0911-1, SUSE-SU-2016:1102-1, SUSE-SU-2016:1203-1, SUSE-SU-2016:2074-1, USN-2886-1, USN-2886-2, USN-2888-1, USN-2890-1, USN-2890-2, USN-2890-3, USN-2907-1, USN-2907-2, USN-2910-1, USN-2910-2, VIGILANCE-VUL-18538.

Description of the vulnerability 

The Linux kernel supports PPTP (Point-to-Point Tunneling Protocol).

The pptp_bind() and pptp_connect() functions are called when a socket is initialized. However, if the size of data in the sockaddr structure is less than the size of a PPTP address, the final bytes are not set.

A local attacker can therefore read a memory fragment by calling the getsockname() function on a PPTP socket on the Linux kernel, in order to obtain sensitive information.
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This computer weakness impacts software or systems such as Debian, Fedora, Linux, openSUSE, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this vulnerability note is low.

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

A proof of concept or an attack tool is available, so your teams have to process this alert. An attacker with a technician ability can exploit this cybersecurity threat.

Solutions for this threat 

Linux kernel: patch for pptp_bind.
A patch is indicated in information sources.

Debian: new linux packages (06/01/2016).
New packages are available:
  Debian 7: linux 3.2.73-2+deb7u2
  Debian 8: linux 3.16.7-ckt20-1+deb8u2

Fedora 22: new kernel packages.
New packages are available:
  Fedora 22: kernel 4.3.4-200.fc22

Fedora 23: new kernel packages.
New packages are available:
  Fedora 23: kernel 4.3.3-300.fc23

openSUSE 11.4: new kernel packages.
New packages are available:
  openSUSE 11.4: kernel 3.0.101-105.1

openSUSE 13.1: new kernel packages (01/02/2016).
New packages are available:
  openSUSE 13.1: kernel 3.11.10-32.1

openSUSE 13.2: new kernel packages (03/02/2016).
New packages are available:
  openSUSE 13.2: kernel 3.16.7-32.1

openSUSE Leap 42.1: new kernel packages (29/01/2016).
New packages are available:
  openSUSE Leap 42.1: kernel pae-4.1.15-8.1

SUSE LE 11: new kernel packages.
New packages are available:
  SUSE LE 11 SP4: kernel 3.0.101-71.2

SUSE LE 11 SP2: new kernel packages (16/08/2016).
New packages are available:
  SUSE LE 11 SP2: kernel 3.0.101-0.7.40.1

SUSE LE 11 SP3: new kernel packages (04/05/2016).
New packages are available:
  SUSE LE 11 SP3: kernel 3.0.101-0.47.79.1

SUSE LE 11 SP4: new kernel-rt packages (20/04/2016).
New packages are available:
  SUSE LE 11 SP4: kernel-rt 3.0.101.rt130-51.1

SUSE LE 12: new kernel packages.
New packages are available:
  SUSE LE 12 RTM: kernel 3.12.51-52.34.1

SUSE LE 12 SP1: new kernel packages (26/02/2016).
New packages are available:
  SUSE LE 12 SP1: kernel 3.12.53-60.30.1

Ubuntu 14.04: new linux-image-3.19.0-51-generic packages.
New packages are available:
  Ubuntu 14.04 LTS: linux-image-3.19.0-51-generic 3.19.0-51.57~14.04.1

Ubuntu: new linux-image-3.13.0-79-generic packages.
New packages are available:
  Ubuntu 12.04 LTS: linux-image-3.13.0-79-generic 3.13.0-79.123~precise1
  Ubuntu 14.04 LTS: linux-image-3.13.0-79-generic 3.13.0-79.123

Ubuntu: new linux-image-3.16.0-60-generic packages.
New packages are available:
  Ubuntu 14.04 LTS: linux-image-3.16.0-60-generic 3.16.0-60.80~14.04.1

Ubuntu: new linux-image-3.2.0-1476-omap4 packages.
New packages are available:
  Ubuntu 12.04 LTS: linux-image-3.2.0-1476-omap4 3.2.0-1476.99

Ubuntu: new linux-image-3.2.0-98-generic packages.
New packages are available:
  Ubuntu 12.04 LTS: linux-image-3.2.0-98-generic 3.2.0-98.138

Ubuntu: new linux-image-4.2.0-1022-raspi2 packages.
New packages are available:
  Ubuntu 15.10: linux-image-4.2.0-1022-raspi2 4.2.0-1022.29

Ubuntu: new linux-image-4.2.0-27-generic packages.
New packages are available:
  Ubuntu 15.10: linux-image-4.2.0-27-generic 4.2.0-27.32
  Ubuntu 14.04 LTS: linux-image-4.2.0-27-generic 4.2.0-27.32~14.04.1
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