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Ubuntu Security Notice USN-4127-2

Ubuntu Security Notice USN-4127-2
Posted Sep 10, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4127-2 - USN-4127-1 fixed several vulnerabilities in Python. This update provides the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM. 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. Various other issues were also addressed.

tags | advisory, denial of service, vulnerability, python
systems | linux, ubuntu
advisories | CVE-2018-20406, CVE-2018-20852, CVE-2019-10160, CVE-2019-5010, CVE-2019-9636, CVE-2019-9948
SHA-256 | 84c230971385afb0f2cb1c23a9c79b6f7d17c2b51f829ff4d131be71dbab0644

Ubuntu Security Notice USN-4127-2

Change Mirror Download
=========================================================================
Ubuntu Security Notice USN-4127-2
September 10, 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

In general, a standard system update will make all the necessary changes.

References:
https://usn.ubuntu.com/4127-2
https://usn.ubuntu.com/4127-1
CVE-2018-20406, CVE-2018-20852, CVE-2019-10160, CVE-2019-5010,
CVE-2019-9636, CVE-2019-9740, CVE-2019-9947, CVE-2019-9948
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