USN-4127-2: Python vulnerabilities

10 September 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

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.

References