Advisory ID:               SYSS-2022-006
Product:                   Store 'n' Go Secure Portable HDD
Manufacturer:              Verbatim
Affected Version(s):       GD25LK01-3637-C VER4.0
Tested Version(s):         GD25LK01-3637-C VER4.0
Vulnerability Type:        Use of a Cryptographic Primitive with a Risky
                            Implementation (CWE-1240)
Risk Level:                Low
Solution Status:           Open
Manufacturer Notification: 2022-01-31
Solution Date:             -
Public Disclosure:         2022-06-08
CVE Reference:             CVE-2022-28382
Author of Advisory:        Matthias Deeg (SySS GmbH)

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Overview:

The Verbatim Store 'n' Go Secure Portable HDD is a portable USB drive
with AES 256-bit hardware encryption and a built-in keypad for passcode
entry.

The manufacturer describes the product as follows:

"The AES 256-bit Hardware Encryption seamlessly encrypts all data on the
drive in real-time with a built-in keypad for password input. The SSD
does not store passwords in the computer or system's volatile memory
making it far more secure than software encryption. Also, if it falls
into the wrong hands, the SSD will lock and require re-formatting after
20 failed password attempts."[1]

Due to the use of an insecure encryption AES mode (Electronic Codebook),
an attacker may be able to extract information even from
encrypted data, for example by observing repeating byte patterns.

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Vulnerability Details:

When analyzing the external SSD Verbatim Store 'n' Go Secure Portable
HDD, Matthias Deeg found out that the firmware of the USB-to-SATA bridge
controller INIC-3637EN uses AES-256 with the ECB (Electronic Codebook)
mode.

This operation mode of block ciphers like AES encrypts identical
plaintext data, in this case blocks of 16 bytes, always to identical
ciphertext data.

For some data, for instance bitmap images, the lack of the cryptographic
property called diffusion concerning the ECB mode can leak sensitive
information even in encrypted data.

One famous example for this is an ECB-encrypted image of the TUX
penguin, which, for instance, is referenced in the Wikipedia article
about block cipher modes of operation[2] to illustrate this issue.

Thus, the use of the ECB operation mode can put the confidentiality of
specific information at risk, even in an encrypted form.

Additionally, in attack scenarios where an attacker has short-time
physical access to a Verbatim Store 'n' Go Portable Secure HDD, and
later returns it to its legitimate owner, the attacker may be able to
compromise the integrity of the stored data by exploiting the fact that
the same 16-byte plaintext blocks result in the same 16-byte ciphertext
blocks, by replacing specific encrypted 16-byte blocks with other ones.

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Proof of Concept (PoC):

The same 16 byte long plaintext pattern was written several times to an
unlocked Verbatim Store 'n' Go Secure Portable HDD.

When the SSD was then read using another SSD enclosure, the same 16
byte long ciphertext pattern could be observed for the corresponding
plaintext data.

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Solution:

SySS GmbH is not aware of a solution for the described security issue.

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Disclosure Timeline:

2022-01-31: Vulnerability reported to manufacturer
2022-02-11: Vulnerability reported to manufacturer again
2022-03-07: Vulnerability reported to manufacturer again
2022-06-08: Public release of security advisory

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References:

[1] Product website for Verbatim Store 'n' Go Secure Portable HDD
 
https://www.verbatim-europe.co.uk/en/prod/store-n-go-portable-ssd-with-keypad-access-256gb-53402/
[2] Wikipedia article about block cipher mode of operation
 
https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Electronic_codebook_(ECB)
[3] SySS Security Advisory SYSS-2022-006
 
https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2022-006.txt
[4] SySS GmbH, SySS Responsible Disclosure Policy
     https://www.syss.de/en/responsible-disclosure-policy

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Credits:

This security vulnerability was found by Matthias Deeg of SySS GmbH.

E-Mail: matthias.deeg (at) syss.de
Public Key: 
https://www.syss.de/fileadmin/dokumente/Materialien/PGPKeys/Matthias_Deeg.asc
Key fingerprint = D1F0 A035 F06C E675 CDB9 0514 D9A4 BF6A 34AD 4DAB

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Disclaimer:

The information provided in this security advisory is provided "as is"
and without warranty of any kind. Details of this security advisory may
be updated in order to provide as accurate information as possible. The
latest version of this security advisory is available on the SySS website.

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Copyright:

Creative Commons - Attribution (by) - Version 3.0
URL: http://creativecommons.org/licenses/by/3.0/deed.en