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USN-3138-1: python-cryptography vulnerability

USN-3138-1: python-cryptography vulnerability

Ubuntu Security Notice USN-3138-1

28th November, 2016

python-cryptography vulnerability

A security issue affects these releases of Ubuntu and its
derivatives:

Summary

python-cryptography could generate incorrect keys.

Software description

Details

Markus Döring discovered that python-cryptography incorrectly handled
certain HKDF lengths. This could result in python-cryptography returning an
empty string instead of the expected derived key.

Update instructions

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

Ubuntu 16.10:
python3-cryptography

1.5-2ubuntu0.1
python-cryptography

1.5-2ubuntu0.1
Ubuntu 16.04 LTS:
python3-cryptography

1.2.3-1ubuntu0.1
python-cryptography

1.2.3-1ubuntu0.1

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

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

References

CVE-2016-9243

Source: USN-3138-1: python-cryptography vulnerability

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