SCRT Information Security has reproduced Denis Andzakovic’s proof-of-concept showing that it is possible to read and write data from a BitLocker-protected device (for instance, a stolen laptop) by sniffing the Trusted Platform Module (TPM) key from the computer LCP bus.
Bitlocker is the Full Disk Encryption (FDE) solution offered by Microsoft for its Windows operating systems starting with Windows Vista to protect users’ data at rest. The solution offers various configurations including several ways to store the decryption key. The most common configuration consists in storing the Volume Master Key (VMK) within the Trusted Platform Module (TPM) that is embedded in recent computers.
This setup is interesting because the decryption is completely transparent to the user. This benefit surpasses others since many companies are reluctant to configure an additional password/PIN for the user to boot its computer. The downside is that it opens the door to several attacks including the TPM sniffing described in this post but also DMA or Cold Boot attacks.
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