Headline
Ubuntu Security Notice USN-6673-3
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.
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Ubuntu Security Notice USN-6673-3
May 27, 2024
python-cryptography vulnerability
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 24.04 LTS
Summary:
python-cryptography could be made to crash if it received specially crafted
input.
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 24.04 LTS.
Original advisory details:
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 24.04 LTS
python3-cryptography 41.0.7-4ubuntu0.1
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-6673-3
https://ubuntu.com/security/notices/USN-6673-1
CVE-2024-26130
Package Information:
https://launchpad.net/ubuntu/+source/python-cryptography/41.0.7-4ubuntu0.1
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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.
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