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Ubuntu Security Notice USN-6513-1
November 23, 2023

python2.7, python3.5, python3.6 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS (Available with Ubuntu Pro)
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)
- Ubuntu 14.04 LTS (Available with Ubuntu Pro)

Summary:

Several security issues were fixed in Python.

Software Description:
- python2.7: 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 plist files.
If a user or an automated system were tricked into processing a specially
crafted plist file, an attacker could possibly use this issue to consume
resources, resulting in a denial of service. (CVE-2022-48564)

It was discovered that Python instances of ssl.SSLSocket were vulnerable
to a bypass of the TLS handshake. An attacker could possibly use this
issue to cause applications to treat unauthenticated received data before
TLS handshake as authenticated data after TLS handshake. (CVE-2023-40217)

Update instructions:

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

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
   python2.7                       2.7.17-1~18.04ubuntu1.13+esm4
   python3.6                       3.6.9-1~18.04ubuntu1.13+esm1

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
   python2.7                       2.7.12-1ubuntu0~16.04.18+esm9
   python3.5                       3.5.2-2ubuntu0~16.04.13+esm12

Ubuntu 14.04 LTS (Available with Ubuntu Pro):
   python2.7                       2.7.6-8ubuntu0.6+esm18

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

References:
   https://ubuntu.com/security/notices/USN-6513-1
   CVE-2022-48564, CVE-2023-40217