Summary
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)
Fixed packages 2
| Release | Package | Fixed in |
|---|---|---|
| Ubuntu · 20.04 LTS 20.04:LTS | python-cryptography | 2.8-3ubuntu0.2 |
| Ubuntu · 22.04 LTS 22.04:LTS | python-cryptography | 3.4.8-1ubuntu2.1 |
Vulnerabilities 2
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Medium 5.9
cryptography vulnerable to NULL-dereference when loading PKCS7 certificates
cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Calling `load_pem_pkcs7_certificates` or `load_der_pkcs7_certificates` could lead to a NULL-pointer dereference and segfault. Exploitation of this vulnerab…
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Medium 4.8
Cipher.update_into can corrupt memory in 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 a…