USN-4127-1: Python vulnerabilities

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

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

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

• CVE-2018-20406
• CVE-2018-20852
• CVE-2019-10160
• CVE-2019-5010
• CVE-2019-9636
• CVE-2019-9740
• CVE-2019-9947
• CVE-2019-9948

Source: USN-4127-1: Python vulnerabilities