Ubuntu 4127-2: Python vulnerabilities

    Date10 Sep 2019
    CategoryUbuntu
    236
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in Python.
    ==========================================================================
    Ubuntu Security Notice USN-4127-2
    September 10, 2019
    
    python2.7, python3.4 vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 14.04 ESM
    - Ubuntu 12.04 ESM
    
    Summary:
    
    Several security issues were fixed in Python.
    
    Software Description:
    - python2.7: An interactive high-level object-oriented language
    - python3.4: An interactive high-level object-oriented language
    
    Details:
    
    USN-4127-1 fixed several vulnerabilities in Python. This update provides
    the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.
    
    Original advisory 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 14.04 ESM. (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 14.04 ESM. (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 14.04 ESM:
      python2.7                       2.7.6-8ubuntu0.6+esm2
      python2.7-minimal               2.7.6-8ubuntu0.6+esm2
      python3.4                       3.4.3-1ubuntu1~14.04.7+esm2
      python3.4-minimal               3.4.3-1ubuntu1~14.04.7+esm2
    
    Ubuntu 12.04 ESM:
      python2.7                       2.7.3-0ubuntu3.14
      python2.7-minimal               2.7.3-0ubuntu3.14
    
    In general, a standard system update will make all the necessary changes.
    
    References:
      https://usn.ubuntu.com/4127-2
      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
    
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