Headline
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.
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Ubuntu Security Notice USN-6673-1
March 04, 2024
python-cryptography vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 23.10
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS (Available with Ubuntu Pro)
Summary:
Several security issues were fixed in python-cryptography.
Software Description:
- python-cryptography: Cryptography Python library
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)
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. (CVE-2024-26130)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 23.10:
python3-cryptography 38.0.4-4ubuntu0.23.10.2
Ubuntu 22.04 LTS:
python3-cryptography 3.4.8-1ubuntu2.2
Ubuntu 20.04 LTS:
python-cryptography 2.8-3ubuntu0.3
python3-cryptography 2.8-3ubuntu0.3
Ubuntu 18.04 LTS (Available with Ubuntu Pro):
python-cryptography 2.1.4-1ubuntu1.4+esm1
python3-cryptography 2.1.4-1ubuntu1.4+esm1
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-6673-1
CVE-2023-50782, CVE-2024-26130
Package Information:
https://launchpad.net/ubuntu/+source/python-cryptography/38.0.4-4ubuntu0.23.10.2
https://launchpad.net/ubuntu/+source/python-cryptography/3.4.8-1ubuntu2.2
https://launchpad.net/ubuntu/+source/python-cryptography/2.8-3ubuntu0.3
Related news
Gentoo Linux Security Advisory 202407-6 - Multiple vulnerabilities have been discovered in cryptography, the worst of which could lead to a denial of service. Versions greater than or equal to 42.0.4 are affected.
Red Hat Security Advisory 2024-3781-03 - An update is now available for Red Hat Ansible Automation Platform 2.4. Issues addressed include HTTP request smuggling, buffer overflow, code execution, cross site scripting, denial of service, memory exhaustion, null pointer, and password leak vulnerabilities.
Ubuntu Security Notice 6673-3 - USN-6673-1 provided a security update for python-cryptography. This update provides the corresponding update for Ubuntu 24.04 LTS. 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.
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.
If `pkcs12.serialize_key_and_certificates` is called with both: 1. A certificate whose public key did not match the provided private key 2. An `encryption_algorithm` with `hmac_hash` set (via `PrivateFormat.PKCS12.encryption_builder().hmac_hash(...)` Then a NULL pointer dereference would occur, crashing the Python process. This has been resolved, and now a `ValueError` is properly raised. Patched in https://github.com/pyca/cryptography/pull/10423
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.