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Vulnerability of Python: information disclosure via HTTP Header Injection

Synthesis of the vulnerability 

An attacker can bypass access restrictions to data via HTTP Header Injection of Python, in order to obtain sensitive information.
Impacted software: Fedora, Python, RHEL, Ubuntu.
Severity of this computer vulnerability: 2/4.
Creation date: 20/07/2020.
Références of this announce: 39603, CVE-2020-26116, FEDORA-2020-16167a66a2, FEDORA-2020-4cf7c3910b, FEDORA-2020-887d3fa26f, FEDORA-2020-d30881c970, FEDORA-2020-e33acdea18, RHSA-2020:4273-01, RHSA-2020:4285-01, RHSA-2020:4299-01, USN-4581-1, VIGILANCE-VUL-32884.

Description of the vulnerability 

An attacker can bypass access restrictions to data via HTTP Header Injection of Python, in order to obtain sensitive information.
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This weakness impacts software or systems such as Fedora, Python, RHEL, Ubuntu.

Our Vigil@nce team determined that the severity of this vulnerability announce 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 threat bulletin.

Solutions for this threat 

Python: version 3.8.5.
The version 3.8.5 is fixed:
  https://www.python.org/downloads/release/python-385/

Python: version 3.7.9.
The version 3.7.9 is fixed:
  https://www.python.org/

Python: version 3.6.12.
The version 3.6.12 is fixed:
  https://www.python.org/

Fedora 31-32: new python35 packages.
New packages are available:
  Fedora 31: python35 3.5.10-1.fc31
  Fedora 32: python35 3.5.10-1.fc32

Python: version 3.5.10.
The version 3.5.10 is fixed:
  https://www.python.org/downloads/release/python-3510/

Python: patch for HTTP Header Injection.
A patch is available:
  https://github.com/python/cpython/commit/668d321476d974c4f51476b33aaca870272523bf

Fedora 31: new python2 packages.
New packages are available:
  Fedora 31: python2 2.7.18-6.fc31

Fedora 32: new python27 packages.
New packages are available:
  Fedora 32: python27 2.7.18-6.fc32

Fedora 32: new python34 packages.
New packages are available:
  Fedora 32: python34 3.4.10-11.fc32

RHEL 6, 7: new rh-python36 packages.
New packages are available:
  RHEL 6.0-6.10: rh-python36 python-3.6.12-1.el6
  RHEL 7.0-7.9: rh-python36 python-3.6.12-1.el7

RHEL 7: new python27 packages.
New packages are available:
  RHEL 7.0-7.9: python27 python-2.7.18-2.el7

RHEL 7: new rh-python38 packages.
New packages are available:
  RHEL 7.0-7.9: rh-python38 python-3.8.6-1.el7

Ubuntu: new python packages.
New packages are available:
  Ubuntu 18.04 LTS: python2.7 2.7.17-1~18.04ubuntu1.2, python3.6 3.6.9-1~18.04ubuntu1.3
  Ubuntu 16.04 LTS: python2.7 2.7.12-1ubuntu0~16.04.13, python3.5 3.5.2-2ubuntu0~16.04.12
  Ubuntu 14.04 ESM: python2.7 2.7.6-8ubuntu0.6+esm7, python3.4 3.4.3-1ubuntu1~14.04.7+esm8
  Ubuntu 12.04 ESM: python2.7 2.7.3-0ubuntu3.19

Wind River Linux: version 10.18.44.20.
The version 10.18.44.20 is fixed:
  https://support2.windriver.com/index.php?page=cve&on=list&show=50&product_id=1&product_version%5B0%5D=23&id_status%5B0%5D=4&cve_id_filter=&s=&submit=&order_by=cve_modified_date&order_way=desc#list

Wind River Linux: version 10.19.45.13.
The version 10.19.45.13 is fixed:
  https://support2.windriver.com/index.php?page=cve&on=list&show=50&product_id=1&product_version%5B0%5D=24&id_status%5B0%5D=4&cve_id_filter=&s=&submit=&order_by=cve_modified_date&order_way=desc#list
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