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             AUSCERT External Security Bulletin Redistribution

                    USN-4333-1: Python vulnerabilities
                               22 April 2020


        AusCERT Security Bulletin Summary

Product:           Python
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Denial of Service        -- Remote with User Interaction
                   Access Confidential Data -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-8492 CVE-2019-18348 

Reference:         ESB-2020.1035

Original Bulletin: 

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USN-4333-1: Python vulnerabilities
21 April 2020

python2.7, python3.4, python3.5, python3.6, python3.7 vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:

  o Ubuntu 19.10
  o Ubuntu 18.04 LTS
  o Ubuntu 16.04 LTS
  o Ubuntu 14.04 ESM
  o Ubuntu 12.04 ESM


Several security issues were fixed in Python.

Software Description

  o python3.7 - An interactive high-level object-oriented language
  o python2.7 - An interactive high-level object-oriented language
  o python3.6 - An interactive high-level object-oriented language
  o python3.5 - An interactive high-level object-oriented language
  o python3.4 - An interactive high-level object-oriented language


It was discovered that Python incorrectly stripped certain characters from
requests. A remote attacker could use this issue to perform CRLF injection.

It was discovered that Python incorrectly handled certain HTTP requests. An
attacker could possibly use this issue to cause a denial of service.

Update instructions

The problem can be corrected by updating your system to the following package

Ubuntu 19.10
    python3.7 - 3.7.5-2~19.10ubuntu1
    python3.7-minimal - 3.7.5-2~19.10ubuntu1
Ubuntu 18.04 LTS
    python2.7 - 2.7.17-1~18.04ubuntu1
    python2.7-minimal - 2.7.17-1~18.04ubuntu1
    python3.6 - 3.6.9-1~18.04ubuntu1
    python3.6-minimal - 3.6.9-1~18.04ubuntu1
Ubuntu 16.04 LTS
    python2.7 - 2.7.12-1ubuntu0~16.04.11
    python2.7-minimal - 2.7.12-1ubuntu0~16.04.11
    python3.5 - 3.5.2-2ubuntu0~16.04.10
    python3.5-minimal - 3.5.2-2ubuntu0~16.04.10
Ubuntu 14.04 ESM
    python2.7 - 2.7.6-8ubuntu0.6+esm5
    python2.7-minimal - 2.7.6-8ubuntu0.6+esm5
    python3.4 - 3.4.3-1ubuntu1~14.04.7+esm6
    python3.4-minimal - 3.4.3-1ubuntu1~14.04.7+esm6
Ubuntu 12.04 ESM
    python2.7 - 2.7.3-0ubuntu3.17
    python2.7-minimal - 2.7.3-0ubuntu3.17

To update your system, please follow these instructions: https://
wiki.ubuntu.com/Security/Upgrades .

In general, a standard system update will make all the necessary changes.


  o CVE-2019-18348
  o CVE-2020-8492

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