TPM2.0 Secret Exposure in CryptoPro Secure Disk

Executive Summary

CPSD CryptoPro Secure Disk for Bitlocker before v7.7.4 stores TPM2.0 secrets in a serialized format within unused disk sectors. An unauthenticated attacker with physical access can recover these secrets and craft an environment to unseal the TPM.

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Detection Guidance

Physical inspection of disk sectors for serialized TPM2.0 secrets is required. Use forensic tools like 'dd' to read unused disk areas and search for patterns matching TPM data storage formats. Example: 'dd if=/dev/sdX of=sector_dump.bin bs=512 skip=START_SECTOR count=COUNT' followed by 'strings sector_dump.bin | grep -i tpm'.

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Impact Analysis

An attacker with physical access to the system disk could extract TPM2.0 secrets, bypass security controls, and gain unauthorized access to encrypted data or system resources.

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Compliance Impact

This vulnerability could lead to unauthorized data access, potentially violating confidentiality requirements in GDPR and HIPAA. Organizations may fail compliance audits if encryption keys are compromised.

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Mitigation Strategies

Upgrade CPSD CryptoPro Secure Disk to version 7.7.4 or later. Ensure physical access controls prevent unauthorized disk handling. Review disk encryption configurations to confirm TPM secrets are not stored in plaintext sectors.

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