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CVE-2019-9836

Status Candidate

Overview

Secure Encrypted Virtualization (SEV) on Advanced Micro Devices (AMD) Platform Security Processor (PSP; aka AMD Secure Processor or AMD-SP) 0.17 build 11 and earlier has an insecure cryptographic implementation.

Related Files

AMD Secure Encrypted Virtualization (SEV) Key Recovery
Posted Jun 26, 2019
Authored by Google Security Research, Cfir Cohen

AMD Secure Encrypted Virtualization (SEV) is a hardware memory encryption feature. SEV protects guest virtual machines from the hypervisor, provides confidentiality guarantees at runtime and remote attestation at launch time. The SEV elliptic-curve (ECC) implementation was found to be vulnerable to an invalid curve attack. At launch-start command, an attacker can send small order ECC points not on the official NIST curves, and force the SEV firmware to multiply a small order point by the firmware's private DH scalar. By collecting enough modular residues, an attacker can recover the complete PDH private key. With the PDH, an attacker can recover the session key and the VM's launch secret. This breaks the confidentiality guarantees offered by SEV.

tags | advisory, remote
advisories | CVE-2019-9836
MD5 | 559575654f299416a1c983c68aaf13ba
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