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Vulnerability of Python: information disclosure via Punycode/IDNA NFKC Normalization

Synthesis of the vulnerability 

An attacker can bypass access restrictions to data via Punycode/IDNA NFKC Normalization of Python, in order to obtain sensitive information.
Vulnerable products: Debian, VNX Operating Environment, VNX Series, Fedora, IBM i, Junos Space, openSUSE Leap, Solaris, Python, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this weakness: 2/4.
Creation date: 08/03/2019.
Références of this bulletin: 1102875, 36216, bulletinapr2019, bulletinjul2019, CVE-2019-9636, DLA-1834-1, DLA-1835-1, DLA-1835-2, DSA-2019-131, FEDORA-2019-1ffd6b6064, JSA10993, openSUSE-SU-2019:1273-1, openSUSE-SU-2019:1282-1, openSUSE-SU-2019:1371-1, openSUSE-SU-2019:1580-1, openSUSE-SU-2020:0086-1, RHSA-2019:0710-01, RHSA-2019:0765-01, RHSA-2019:0806-01, RHSA-2019:0902-01, RHSA-2019:1467-01, RHSA-2019:2980-01, RHSA-2019:3170-01, SUSE-SU-2019:0961-1, SUSE-SU-2019:0971-1, SUSE-SU-2019:0972-1, SUSE-SU-2019:14018-1, SUSE-SU-2019:1439-1, SUSE-SU-2020:0114-1, SUSE-SU-2020:0234-1, SUSE-SU-2020:0302-1, USN-4127-1, USN-4127-2, VIGILANCE-VUL-28692.

Description of the vulnerability 

An attacker can bypass access restrictions to data via Punycode/IDNA NFKC Normalization of Python, in order to obtain sensitive information.
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This vulnerability bulletin impacts software or systems such as Debian, VNX Operating Environment, VNX Series, Fedora, IBM i, Junos Space, openSUSE Leap, Solaris, Python, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

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

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

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

Solutions for this threat 

Python: version 3.7.3.
The version 3.7.3 is fixed:
  https://www.python.org/downloads/

Python: version 3.6.9.
The version 3.6.9 is fixed:
  https://www.python.org/downloads/

Python: version 3.5.7.
The version 3.5.7 is fixed:
  https://www.python.org/downloads/

Python: version 3.4.10.
The version 3.4.10 is fixed:
  https://www.python.org/downloads/

Python: patch for Punycode/IDNA NFKC Normalization.
A patch is available:
  3.8: https://github.com/python/cpython/commit/16e6f7dee7f02bb81aa6b385b982dcdda5b99286
  3.7: https://github.com/python/cpython/commit/daad2c482c91de32d8305abbccc76a5de8b3a8be
  2.7: https://github.com/python/cpython/commit/e37ef41289b77e0f0bb9a6aedb0360664c55bdd5

Debian 8: new python2.7 packages.
New packages are available:
  Debian 8: python2.7 2.7.9-2+deb8u3

Debian 8: new python3.4 packages.
New packages are available:
  Debian 8: python3.4 3.4.2-1+deb8u4

Dell EMC VNXe3200: version 3.1.10.9946299.
The version 3.1.10.9946299 is fixed:
  https://www.dell.com/

Fedora: new python3 packages.
New packages are available:
  Fedora 30: python3 3.7.3-3.fc30

IBM i: solution for Python.
The solution is indicated in information sources.

Junos Space: version 19.4R1.
The version 19.4R1 is fixed:
  https://www.juniper.net/support/downloads/

openSUSE Leap 15.0: new python packages.
New packages are available:
  openSUSE Leap 15.0: python 2.7.14-lp150.6.10.1

openSUSE Leap 15.1: new python3 packages (22/01/2020).
New packages are available:
  openSUSE Leap 15.1: python3 3.6.10-lp151.6.7.1

openSUSE Leap 42.3: new python packages.
New packages are available:
  openSUSE Leap 42.3: python 2.7.13-27.15.1

openSUSE Leap: new python3 packages.
New packages are available:
  openSUSE Leap 15.0: python3 3.6.5-lp150.2.10.1
  openSUSE Leap 42.3: python3 3.4.6-12.10.2

Oracle Solaris: patch for third party software of April 2019 v2.
A patch is available:
  https://support.oracle.com/rs?type=doc&id=1448883.1

Oracle Solaris: patch for third party software of April 2020 v2.
A patch is available:
  https://support.oracle.com/rs?type=doc&id=1448883.1

Oracle Solaris: patch for third party software of July 2019 v2.
A patch is available:
  https://support.oracle.com/rs?type=doc&id=1448883.1

RHEL 6.10: new python packages.
New packages are available:
  RHEL 6: python 2.6.6-68.el6_10

RHEL 7.4: new python packages.
New packages are available:
  RHEL 7: python 2.7.5-59.el7_4

RHEL 7.5: new python packages.
New packages are available:
  RHEL 7: python 2.7.5-70.el7_5

RHEL 7.6: new python packages.
New packages are available:
  RHEL 7: python 2.7.5-77.el7_6

RHEL: new python27-python packages.
New packages are available:
  RHEL 6: python27-python 2.7.13-4.el6
  RHEL 7: python27-python 2.7.13-6.el7

RHEL: new rh-python35-python packages.
New packages are available:
  RHEL 6: rh-python35-python 3.5.1-12.el6
  RHEL 7: rh-python35-python 3.5.1-12.el7

RHEL: new rh-python36-python packages.
New packages are available:
  RHEL 6: rh-python36-python 3.6.3-4.el6
  RHEL 7: rh-python36-python 3.6.3-7.el7

SUSE LE 11: new python packages.
New packages are available:
  SUSE LE 11 SP3: python 2.6.9-40.24.1
  SUSE LE 11 SP4: python 2.6.9-40.24.1

SUSE LE 12: new python3 packages.
New packages are available:
  SUSE LE 12 RTM: python3 3.4.6-25.24.1
  SUSE LE 12 SP1: python3 3.4.6-25.24.1
  SUSE LE 12 SP3: python3 3.4.6-25.24.1
  SUSE LE 12 SP4: python3 3.4.6-25.24.1

SUSE LE 12: new python packages.
New packages are available:
  SUSE LE 12 SP1: python 2.7.13-28.26.1
  SUSE LE 12 SP2: python 2.7.13-28.26.1
  SUSE LE 12 SP3: python 2.7.13-28.26.1
  SUSE LE 12 SP4: python 2.7.13-28.26.1

SUSE LE 12 SP5: new python36 packages.
New packages are available:
  SUSE LE 12 SP5: python36 3.6.10-4.3.5

SUSE LE 15: new python3 packages (16/01/2020).
New packages are available:
  SUSE LE 15 RTM: python3 3.6.10-3.42.2
  SUSE LE 15 SP1: python3 3.6.10-3.42.2

SUSE LE 15: new python3 packages (18/04/2019).
New packages are available:
  SUSE LE 15 RTM: python3 3.6.5-3.11.1

SUSE LE 15: new python packages (18/04/2019).
New packages are available:
  SUSE LE 15 RTM: python 2.7.14-7.11.1

SUSE LE 15: new python packages (27/01/2020).
New packages are available:
  SUSE LE 15 RTM: python 2.7.17-7.32.2
  SUSE LE 15 SP1: python 2.7.17-7.32.2

Ubuntu: new python packages.
New packages are available:
  Ubuntu 19.04: python2.7 2.7.16-2ubuntu0.1, python3.7 3.7.3-2ubuntu0.1
  Ubuntu 18.04 LTS: python2.7 2.7.15-4ubuntu4~18.04.1, python3.6 3.6.8-1~18.04.2
  Ubuntu 16.04 LTS: python2.7 2.7.12-1ubuntu0~16.04.8, python3.5 3.5.2-2ubuntu0~16.04.8
  Ubuntu 14.04 ESM: python2.7 2.7.6-8ubuntu0.6+esm2, python3.4 3.4.3-1ubuntu1~14.04.7+esm2
  Ubuntu 12.04 ESM: python2.7 2.7.3-0ubuntu3.14

Wind River Linux: version 10.18.44.9.
The version 10.18.44.9 is fixed:
  https://support2.windriver.com/
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