#git

### Summary A malicious host may provide a crafted LUKS2 volume to a confidential computing guest that is using the [OpenCryptDevice](https://github.com/edgelesssys/constellation/blob/6eff250f16f8ae48221d412550e4a64a4bf0d77b/csi/cryptmapper/cryptmapper.go#L89) feature. The guest will open the volume and write secret data using a volume key known to the attacker. The attacker can also pre-load data on the device, which could potentially compromise guest execution. LUKS2 volume metadata is not authenticated and supports null key-encryption algorithms, allowing an attacker to create a volume such that the volume: - Opens (cryptsetup open) without error using any passphrase or token - Records all writes in plaintext (or ciphertext with an attacker-known key) - Contains arbitrary data chosen by the attacker ### Details The Constellation CVM image uses LUKS2-encrypted volumes for persistent storage. When opening an encrypted storage device, the CVM uses the `libcryptsetup` function [cry...

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