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Ubuntu Security Notice USN-6673-2

Ubuntu Security Notice 6673-2 - USN-6673-1 provided a security update for python-cryptography. This update provides the corresponding update for Ubuntu 16.04 LTS. 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.

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

python-cryptography vulnerability

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

Related news

Ubuntu Security Notice USN-6673-1

Ubuntu Security Notice 6673-1 - 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. It was discovered that python-cryptography incorrectly handled memory operations when processing mismatched PKCS#12 keys. A remote attacker could possibly use this issue to cause python-cryptography to crash, leading to a denial of service. This issue only affected Ubuntu 23.10.

GHSA-3ww4-gg4f-jr7f: Python Cryptography package vulnerable to Bleichenbacher timing oracle attack

A flaw was found in the python-cryptography package. This issue may allow a remote attacker to decrypt captured messages in TLS servers that use RSA key exchanges, which may lead to exposure of confidential or sensitive data.

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