Ubuntu 4127-1: Python vulnerabilities

    Date09 Sep 2019
    CategoryUbuntu
    345
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in Python.
    ==========================================================================
    Ubuntu Security Notice USN-4127-1
    September 09, 2019
    
    python2.7, python3.5, python3.6, python3.7 vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 19.04
    - Ubuntu 18.04 LTS
    - Ubuntu 16.04 LTS
    
    Summary:
    
    Several security issues were fixed in Python.
    
    Software Description:
    - python2.7: An interactive high-level object-oriented language
    - python3.7: An interactive high-level object-oriented language
    - python3.6: An interactive high-level object-oriented language
    - python3.5: An interactive high-level object-oriented language
    
    Details:
    
    It was discovered that Python incorrectly handled certain pickle files. An
    attacker could possibly use this issue to consume memory, leading to a
    denial of service. This issue only affected Ubuntu 16.04 LTS and Ubuntu
    18.04 LTS. (CVE-2018-20406)
    
    It was discovered that Python incorrectly validated the domain when
    handling cookies. An attacker could possibly trick Python into sending
    cookies to the wrong domain. (CVE-2018-20852)
    
    Jonathan Birch and Panayiotis Panayiotou discovered that Python incorrectly
    handled Unicode encoding during NFKC normalization. An attacker could
    possibly use this issue to obtain sensitive information. (CVE-2019-9636,
    CVE-2019-10160)
    
    Colin Read and Nicolas Edet discovered that Python incorrectly handled
    parsing certain X509 certificates. An attacker could possibly use this
    issue to cause Python to crash, resulting in a denial of service. This
    issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2019-5010)
    
    It was discovered that Python incorrectly handled certain urls. A remote
    attacker could possibly use this issue to perform CRLF injection attacks.
    (CVE-2019-9740, CVE-2019-9947)
    
    Sihoon Lee discovered that Python incorrectly handled the local_file:
    scheme. A remote attacker could possibly use this issue to bypass blacklist
    meschanisms. (CVE-2019-9948)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 19.04:
      python2.7                       2.7.16-2ubuntu0.1
      python2.7-minimal               2.7.16-2ubuntu0.1
      python3.7                       3.7.3-2ubuntu0.1
      python3.7-minimal               3.7.3-2ubuntu0.1
    
    Ubuntu 18.04 LTS:
      python2.7                       2.7.15-4ubuntu4~18.04.1
      python2.7-minimal               2.7.15-4ubuntu4~18.04.1
      python3.6                       3.6.8-1~18.04.2
      python3.6-minimal               3.6.8-1~18.04.2
    
    Ubuntu 16.04 LTS:
      python2.7                       2.7.12-1ubuntu0~16.04.8
      python2.7-minimal               2.7.12-1ubuntu0~16.04.8
      python3.5                       3.5.2-2ubuntu0~16.04.8
      python3.5-minimal               3.5.2-2ubuntu0~16.04.8
    
    In general, a standard system update will make all the necessary changes.
    
    References:
      https://usn.ubuntu.com/4127-1
      CVE-2018-20406, CVE-2018-20852, CVE-2019-10160, CVE-2019-5010,
      CVE-2019-9636, CVE-2019-9740, CVE-2019-9947, CVE-2019-9948
    
    Package Information:
      https://launchpad.net/ubuntu/+source/python2.7/2.7.16-2ubuntu0.1
      https://launchpad.net/ubuntu/+source/python3.7/3.7.3-2ubuntu0.1
      https://launchpad.net/ubuntu/+source/python2.7/2.7.15-4ubuntu4~18.04.1
      https://launchpad.net/ubuntu/+source/python3.6/3.6.8-1~18.04.2
      https://launchpad.net/ubuntu/+source/python2.7/2.7.12-1ubuntu0~16.04.8
      https://launchpad.net/ubuntu/+source/python3.5/3.5.2-2ubuntu0~16.04.8
    
    
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