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Ubuntu Security Notice USN-6673-2
March 14, 2024

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

- Ubuntu 16.04 LTS (Available with Ubuntu Pro)

Summary:

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

Software Description:
- python-cryptography: Cryptography Python library

Details:

USN-6673-1 provided a security update for python-cryptography.
This update provides the corresponding update for Ubuntu 16.04 LTS.

Original advisory details:

  Hubert Kario discovered that python-cryptography incorrectly handled
  errors returned by the OpenSSL API when processing incorrect padding in
  RSA PKCS#1 v1.5. A remote attacker could possibly use this issue to expose
  confidential or sensitive information. (CVE-2023-50782)

Update instructions:

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

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
   python-cryptography             1.2.3-1ubuntu0.3+esm1
   python3-cryptography            1.2.3-1ubuntu0.3+esm1

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

References:
   https://ubuntu.com/security/notices/USN-6673-2
   https://ubuntu.com/security/notices/USN-6673-1
   CVE-2023-50782