Mark use of PKCS1v15 for encryption and decryption a vulnerability

[tomato42]

Is your feature request related to a problem? Please describe.
While pyca/cryptography is generally a high quality wrapper around OpenSSL, because of peculiarities of Python it is impossible to handle PKCS#1 v1.5 decryption failures in side channel free manner. As such, all usages of it will leak information useful in mounting the Bleichenbacher/Marvin attack: pyca/cryptography#9785

Describe the solution you'd like
Any use of the cryptography.hazmat.primitives.asymmetric.padding.PKCS1v15 for decryption (or encryption) should be marked as vulnerabilities.

Describe alternatives you've considered
it's impossible to handle exceptions in Python in side-channel free manner
the PKCS#1 v1.5 is known to be insecure for over 25 years at this point, it's high time to stop use of it

the alternative is to use RSA-OAEP encryption

Additional context
https://people.redhat.com/~hkario/marvin/

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[tomato42]

Same thing applies to python-rsa package: sybrenstuvel/python-rsa#230 but then, use of any private keys with it is insecure: https://github.com/sybrenstuvel/python-rsa#security not just PKCS#1 v1.5 decryption

[tomato42]

Same thing applies to the M2Crypto library: https://gitlab.com/m2crypto/m2crypto/-/issues/342

[tomato42]

The M2Crypto issue has been assigned CVE-2023-50781, the pyca/cryptography issue has been assigned CVE-2023-50782