USN-4127-2: Python vulnerabilities

Releases

• Ubuntu 14.04 ESM
• Ubuntu 12.04

Packages

• 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 blocklist
meschanisms. (CVE-2019-9948)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 14.04

• 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

• 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

• 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-4127-1: libpython3.7-stdlib, libpython3.5-minimal, libpython3.6, libpython3.6-testsuite, python3.6-doc, libpython3.7-testsuite, python3.6-minimal, python2.7-doc, idle-python3.7, python3.5-doc, python3.7, python3.5-dev, libpython3.6-dev, idle-python2.7, libpython2.7-testsuite, idle-python3.5, python3.6-venv, python3.5-minimal, python2.7, python2.7-minimal, python3.6-examples, libpython3.6-minimal, libpython3.6-stdlib, libpython2.7-stdlib, python3.5-examples, python3.6-dev, python3.7-doc, idle-python3.6, python3.6, libpython3.5-dev, libpython2.7, libpython3.7-dev, python2.7-examples, libpython3.5-stdlib, python3.5-venv, python3.7-examples, libpython3.7-minimal, python3.7-dev, python3.5, python3.7-minimal, libpython2.7-dev, python3.7-venv, libpython3.7, libpython2.7-minimal, libpython3.5-testsuite, python2.7-dev, libpython3.5