Python Security Updates for Ubuntu
Posted on: 09/10/2019 04:01 PM

Updated Python packages has been released for Ubuntu 12.04 ESM and 14.04 ESM

Python Security Updates for Ubuntu


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Ubuntu Security Notice USN-4127-2
September 10, 2019

python2.7, python3.4 vulnerabilities
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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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