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Ubuntu Security Notice USN-4613-1

Ubuntu Security Notice USN-4613-1
Posted Nov 3, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4613-1 - Hubert Kario discovered that python-cryptography incorrectly handled certain decryption. An attacker could possibly use this issue to expose sensitive information.

tags | advisory, python
systems | linux, ubuntu
advisories | CVE-2020-25659
MD5 | f58620abad4842bf57a4df18084b6b7d

Ubuntu Security Notice USN-4613-1

Change Mirror Download
=========================================================================
Ubuntu Security Notice USN-4613-1
November 03, 2020

python-cryptography vulnerability
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

python-cryptography could be made to expose sensitive information over the
network.

Software Description:
- python-cryptography: Cryptography Python library

Details:

Hubert Kario discovered that python-cryptography incorrectly handled certain decryption.
An attacker could possibly use this issue to expose sensitive information.

Update instructions:

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

Ubuntu 20.10:
python3-cryptography 3.0-1ubuntu0.1

Ubuntu 20.04 LTS:
python-cryptography 2.8-3ubuntu0.1
python3-cryptography 2.8-3ubuntu0.1

Ubuntu 18.04 LTS:
python-cryptography 2.1.4-1ubuntu1.4
python3-cryptography 2.1.4-1ubuntu1.4

Ubuntu 16.04 LTS:
python-cryptography 1.2.3-1ubuntu0.3
python3-cryptography 1.2.3-1ubuntu0.3

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

References:
https://usn.ubuntu.com/4613-1
CVE-2020-25659

Package Information:
https://launchpad.net/ubuntu/+source/python-cryptography/3.0-1ubuntu0.1
https://launchpad.net/ubuntu/+source/python-cryptography/2.8-3ubuntu0.1
https://launchpad.net/ubuntu/+source/python-cryptography/2.1.4-1ubuntu1.4
https://launchpad.net/ubuntu/+source/python-cryptography/1.2.3-1ubuntu0.3
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