CVE-2023-23931 — Cipher.update_into can corrupt memory in pyca cryptography

Affected: pyca cryptography

cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. In affected versions `Cipher.update_into` would accept Python objects which implement the buffer protocol, but provide only immutable buffers. This would allow immutable objects (such as `bytes`) to be mutated, thus violating fundamental rules of Python and resulting in corrupted output. This now correctly raises an exception. This issue has been present since `update_into` was originally introduced in cryptography 1.8.

USN-6539-1 — python-cryptography vulnerabilities

Affected: Ubuntu:20.04:LTS: python-cryptography, Ubuntu:22.04:LTS: python-cryptography

It was discovered that the python-cryptography Cipher.update_into function would incorrectly accept objects with immutable buffers. This would result in corrupted output, contrary to expectations. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, and Ubuntu 23.04. (CVE-2023-23931)

It was dicovered that python-cryptography incorrectly handled loading certain PKCS7 certificates. A remote attacker could possibly use this issue to cause python-cryptography to crash, resulting in a denial of service. This issue only affected Ubuntu 22.04 LTS, Ubuntu 23.04, and Ubuntu 23.10. (CVE-2023-49083)

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CVE-2023-23931 — Cipher.update_into can corrupt memory in pyca cryptography

USN-6539-1 — python-cryptography vulnerabilities