USN-4127-1: Python vulnerabilities

Releases

• Ubuntu 19.04
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM

Packages

• python2.7 - An interactive high-level object-oriented language
• python3.5 - An interactive high-level object-oriented language
• python3.6 - An interactive high-level object-oriented language
• python3.7 - 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 blocklist
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

• 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

• 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

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

Related notices

• USN-4127-2: python2.7, libpython3.4, idle-python3.4, libpython3.4-testsuite, python3.4-dev, python3.4-venv, idle-python2.7, python2.7-examples, libpython2.7-minimal, python2.7-doc, python2.7-minimal, libpython2.7-dev, python3.4-minimal, python2.7-dev, libpython2.7-testsuite, libpython2.7, libpython2.7-stdlib, python3.4, libpython3.4-stdlib, python3.4-examples, python3.4-doc, libpython3.4-minimal, libpython3.4-dev
• USN-6891-1: idle-python3.9, libpython3.9, libpython3.5, python3.10-nopie, libpython3.10-dev, libpython3.11-testsuite, libpython3.5-minimal, python3.9-venv, libpython3.7-minimal, python3.8-venv, python3.11, python3.11-examples, libpython3.8-minimal, libpython3.6-dev, idle-python3.10, python3.8, python3.10-minimal, libpython3.7, python3.12-examples, python3.11-doc, python3.7-examples, libpython3.12-testsuite, python3.11-minimal, libpython3.8-stdlib, idle-python3.7, python3.10-full, python3.9-examples, python3.8-examples, libpython3.8, python3.6-examples, python3.9, python3.11-full, libpython3.8-dev, python3.12-minimal, python3.10-dev, python3.9-doc, python3.12-nopie, python3.10-venv, python3.10-examples, python3.11-dev, python3.7, python3.7-venv, libpython3.8-testsuite, python3.11-nopie, python3.9-full, idle-python3.6, python3.8-dev, python3.6-dev, libpython3.6-stdlib, python3.12-doc, libpython3.10-stdlib, libpython3.5-stdlib, libpython3.9-testsuite, idle-python3.12, python3.6-venv, libpython3.12-stdlib, libpython3.9-dev, libpython3.11-dev, libpython3.10, libpython3.7-testsuite, python3.7-minimal, libpython3.10-testsuite, libpython3.6-testsuite, idle-python3.5, idle-python3.8, python3.5, python3.5-doc, python3.6, libpython3.11, python3.12-dev, libpython3.11-minimal, python3.12, libpython3.12-dev, python3.8-minimal, python3.8-full, python3.9-minimal, python3.12-full, libpython3.7-dev, libpython3.12-minimal, python3.5-examples, libpython3.12, python3.9-dev, idle-python3.11, libpython3.6-minimal, libpython3.5-dev, libpython3.11-stdlib, libpython3.5-testsuite, python3.5-minimal, libpython3.9-minimal, python3.11-venv, python3.7-dev, libpython3.6, python3.6-minimal, python3.6-doc, python3.8-doc, python3.5-dev, python3.5-venv, libpython3.9-stdlib, python3.12-venv, libpython3.7-stdlib, python3.7-doc, python3.10-doc, libpython3.10-minimal, python3.10