이름: Internal Asset Exposed to Unsafe Debug Access Level or State

The product uses physical debug or test interfaces with support for multiple access levels, but it assigns the wrong debug access level to an internal asset, providing unintended access to the asset from untrusted debug agents.

일반 정보

배경 세부 정보

취약점 도입 방식

Architecture and Design
Implementation

적용 가능한 플랫폼

언어

클래스: Not Language-Specific (Undetermined)

운영 체제

클래스: Not OS-Specific (Undetermined)

아키텍처

클래스: Not Architecture-Specific (Undetermined)

기술

클래스: System on Chip (Undetermined)

일반적인 결과

범위	영향	가능성
Confidentiality	Read Memory 참고: If a protection mechanism does not ensure that internal assets have the correct debug access level during each boot stage or change in system state, an attacker could obtain sensitive information from the internal asset using a debugger.
Integrity	Modify Memory
Authorization Access Control	Gain Privileges or Assume Identity, Bypass Protection Mechanism

관찰된 예시

참고 자료	설명
CVE-2019-18827	After ROM code execution, JTAG access is disabled. But before the ROM code is executed, JTAG access is possible, allowing a user full system access. This allows a user to modify the boot flow and successfully bypass the secure-boot process.

잠재적 완화 방법

Phases : Architecture and Design // Implementation
Phases : Architecture and Design
Apply blinding [REF-1219] or masking techniques in strategic areas.
Phases : Implementation
Add shielding or tamper-resistant protections to the device, which increases the difficulty and cost for accessing debug/test interfaces.

탐지 방법

Manual Analysis

Check 2 devices for their passcode to authenticate access to JTAG/debugging ports. If the passcodes are missing or the same, update the design to fix and retest. Check communications over JTAG/debugging ports for encryption. If the communications are not encrypted, fix the design and retest.
효과성 : Moderate

취약점 매핑 메모

근거 : This CWE entry is at the Base level of abstraction, which is a preferred level of abstraction for mapping to the root causes of vulnerabilities.
댓글 : Carefully read both the name and description to ensure that this mapping is an appropriate fit. Do not try to 'force' a mapping to a lower-level Base/Variant simply to comply with this preferred level of abstraction.

메모

CWE-1191 and CWE-1244 both involve physical debug access, but the weaknesses are different. CWE-1191 is effectively about missing authorization for a debug interface, i.e. JTAG. CWE-1244 is about providing internal assets with the wrong debug access level, exposing the asset to untrusted debug agents.

참고 자료

REF-1056

Multiple Vulnerabilities in Barco Clickshare: JTAG access is not permanently disabled
F-Secure Labs.
https://labs.withsecure.com/advisories/multiple-vulnerabilities-in-barco-clickshare

REF-1057

Attacks and Defenses for JTAG
Kurt Rosenfeld, Ramesh Karri.
https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5406671

REF-1219

Blindsight: Blinding EM Side-Channel Leakage using Built-In Fully Integrated Inductive Voltage Regulator
Monodeep Kar, Arvind Singh, Santosh Ghosh, Sanu Mathew, Anand Rajan, Vivek De, Raheem Beyah, Saibal Mukhopadhyay.
https://arxiv.org/pdf/1802.09096

REF-1377

csr_regile.sv line 938
https://github.com/HACK-EVENT/hackatdac19/blob/57e7b2109c1ea2451914878df2e6ca740c2dcf34/src/csr_regfile.sv#L938

REF-1378

Fix for csr_regfile.sv line 938
https://github.com/HACK-EVENT/hackatdac19/blob/a7b61209e56c48eec585eeedea8413997ec71e4a/src/csr_regfile.sv#L938C31-L938C56

제출

이름	조직	날짜	출시일	Version
Arun Kanuparthi, Hareesh Khattri, Parbati Kumar Manna, Narasimha Kumar V Mangipudi	Intel Corporation	2020-02-12 +00:00	2020-02-24 +00:00	4.0

수정 사항

이름	조직	날짜	댓글
CWE Content Team	MITRE	2020-08-20 +00:00	updated Demonstrative_Examples, Name, Observed_Examples, Related_Attack_Patterns
CWE Content Team	MITRE	2021-03-15 +00:00	updated Maintenance_Notes
CWE Content Team	MITRE	2021-10-28 +00:00	updated Demonstrative_Examples, Description, Detection_Factors, Maintenance_Notes, Name, Observed_Examples, Potential_Mitigations, References, Relationship_Notes, Relationships, Weakness_Ordinalities
CWE Content Team	MITRE	2022-04-28 +00:00	updated Related_Attack_Patterns
CWE Content Team	MITRE	2023-04-27 +00:00	updated References, Relationships
CWE Content Team	MITRE	2023-06-29 +00:00	updated Mapping_Notes
CWE Content Team	MITRE	2024-02-29 +00:00	updated Demonstrative_Examples, References
CWE Content Team	MITRE	2025-09-09 +00:00	updated References, Relationships
CWE Content Team	MITRE	2025-12-11 +00:00	updated Common_Consequences, Description
CWE Content Team	MITRE	2026-10-28 +00:00	updated Background_Details, Demonstrative_Examples, Description

CWE-1244 상세 정보

CWE-1244