Exploitalert - Database of Exploits

Lepin EP-KP001 KP001_V19 Authentication Bypass

CVE	Category	Price	Severity
CVE-2022-29948	CWE-657	$500	High

Author	Risk	Exploitation Type	Date
Unknown	High	Remote	2022-06-20

CVSS	EPSS	EPSSP
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	0.02192	0.50148

CVSS vector description

Metric	Value	Metric Description	Value Description
Attack vector	Network	AV	The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity	Low	AC	The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required	Low	PR	The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
User Interaction	None	UI	The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope	Unchanged	S	An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality	High	C	There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity	High	I	There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability	High	A	There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.

https://cxsecurity.com/ascii/WLB-2022060053

Lepin EP-KP001 KP001_V19 Authentication Bypass

Advisory ID: SYSS-2022-024 Product: EP-KP001 Manufacturer: Lepin Affected Version(s): KP001_V19 Tested Version(s): KP001_V19 Vulnerability Type: Violation of Secure Design Principles (CWE-657) Risk Level: High Solution Status: Open Manufacturer Notification: 2022-04-12 Solution Date: - Public Disclosure: 2022-06-10 CVE Reference: CVE-2022-29948 Author of Advisory: Matthias Deeg (SySS GmbH) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Overview: The Lepin EP-KP001 is a USB flash drive with AES-256 hardware encryption and a built-in keypad for passcode entry. The manufacturer describes the product as follows (see [1]): "[Safeguard Your Sensitive DATA] With Military Grade Full-disk 256-bit AES XTS Hardware Encryption to protect your important files. All your data is protected by hardware encryption, so no one can access your data without knowing the password." Due to an insecure design, the Lepin EP-KP001 flash drive is vulnerable to an authentication bypass attack which enables an attacker to gain unauthorized access to the stored encrypted data. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Vulnerability Details: When analyzing the USB flash drive Lepin EP-KP001, Matthias Deeg found out that it uses an insecure hardware design which allows an attacker to bypass the password-based user authentication. The Lepin EP-KP001 consists of the following four main parts: 1. An unknown NAND flash memory chip 2. An Alcor Micro flash disk controller (AU6989SNBL-GTD) 3. An unknown microcontroller (unkmarked chip) used as keypad controller 4. A high-speed analog switch (SGM7222) The encrypted disk partition with the stored user data can be unlocked by entering the correct passcode via the keypad and pressing the "unlock" button. Due to the performed analysis, the password-based user authentication via a passcode comprised of 6 to 14 digits is performed by the unknown microcontroller. By replacing this unknown microcontroller on a target device with one from an attacker-controlled Lepin EP-KP001 whose passcode was known, it was possible to successfully unlock the targeted Lepin EP-KP001 USB flash drive and to gain unauthorized access to the stored data in cleartext. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Proof of Concept (PoC): A successful authentication bypass attack could be performed via the following steps: 1. Set a passcode on an attacker-controlled Lepin EP-KP001. 2. Desolder the unmarked microcontroller from the attacker-controlled device. 3. Desolder the unmarked microcontroller from the targeted Lepin EP-KP001. 4. Solder the unmarked microcontroller from the attacker-controlled device on the targeted device. 5. Unlock the targeted device with the initially set and known passcode. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Solution: SySS is not aware of a security fix for the described security issue. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Disclosure Timeline: 2022-04-12: Vulnerability reported to manufacturer 2022-06-10: Public release of security advisory ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ References: [1] Product website for Lepin EP-KP001 https://www.amazon.com/Encrypted-Password-Aluminum-Portable-Protected/dp/B06W5H9GP7/ [2] SySS Security Advisory SYSS-2022-024 https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2022-024.txt [4] SySS GmbH, SySS Responsible Disclosure Policy https://www.syss.de/en/responsible-disclosure-policy ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Copyright: Creative Commons - Attribution (by) - Version 3.0 URL: http://creativecommons.org/licenses/by/3.0/deed.en

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