USN-4127-1: Python vulnerabilities

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

Ubuntu 18.04 LTS

Ubuntu 16.04 LTS

To update your system, please follow these instructions: