名前: Improper Setting of Bus Controlling Capability in Fabric End-point

The bus controller enables bits in the fabric end-point to allow responder devices to control transactions on the fabric.

一般情報

導入モード

Architecture and Design
Implementation
System Configuration

適用可能なプラットフォーム

言語

クラス： Not Language-Specific (Undetermined)

オペレーティングシステム

クラス： Not OS-Specific (Undetermined)

アーキテクチャ

クラス： Not Architecture-Specific (Undetermined)

テクノロジー

クラス： Not Technology-Specific (Undetermined)

一般的な結果

スコープ	影響	可能性
Access Control	Modify Memory, Read Memory, Bypass Protection Mechanism

潜在的な緩和策

Phases : Architecture and Design
For responder devices, the register bit in the fabric end-point that enables the bus controlling capability must be set to 0 by default. This bit should not be set during secure-boot flows. Also, writes to this register must be access-protected to prevent malicious modifications to obtain bus-controlling capability.
Phases : Implementation
For responder devices, the register bit in the fabric end-point that enables the bus controlling capability must be set to 0 by default. This bit should not be set during secure-boot flows. Also, writes to this register must be access-protected to prevent malicious modifications to obtain bus-controlling capability.
Phases : System Configuration
For responder devices, the register bit in the fabric end-point that enables the bus controlling capability must be set to 0 by default. This bit should not be set during secure-boot flows. Also, writes to this register must be access-protected to prevent malicious modifications to obtain bus-controlling capability.

脆弱性マッピングノート

理由 : 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.
コメント : 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.

関連する攻撃パターン

CAPEC ID	攻撃パターン名
CAPEC-1	Accessing Functionality Not Properly Constrained by ACLs In applications, particularly web applications, access to functionality is mitigated by an authorization framework. This framework maps Access Control Lists (ACLs) to elements of the application's functionality; particularly URL's for web apps. In the case that the administrator failed to specify an ACL for a particular element, an attacker may be able to access it with impunity. An attacker with the ability to access functionality not properly constrained by ACLs can obtain sensitive information and possibly compromise the entire application. Such an attacker can access resources that must be available only to users at a higher privilege level, can access management sections of the application, or can run queries for data that they otherwise not supposed to.
CAPEC-180	Exploiting Incorrectly Configured Access Control Security Levels An attacker exploits a weakness in the configuration of access controls and is able to bypass the intended protection that these measures guard against and thereby obtain unauthorized access to the system or network. Sensitive functionality should always be protected with access controls. However configuring all but the most trivial access control systems can be very complicated and there are many opportunities for mistakes. If an attacker can learn of incorrectly configured access security settings, they may be able to exploit this in an attack.

参考文献

REF-1135

Bypassing IOMMU Protection against I/O Attacks
Benoit Morgan, Eric Alata, Vincent Nicomette, Mohamed Kaaniche.
https://hal.archives-ouvertes.fr/hal-01419962/document

REF-1136

Exploitation from malicious PCI Express peripherals
Colin L. Rothwell.
https://www.cl.cam.ac.uk/techreports/UCAM-CL-TR-934.pdf

登録情報

名前	組織	日付	リリース日	Version
Arun Kanuparthi, Hareesh Khattri, Parbati K. Manna	Intel Corporation	2020-05-19 +00:00	2020-12-10 +00:00	4.3

変更履歴

名前	組織	日付	コメント
CWE Content Team	MITRE	2021-10-28 +00:00	updated Maintenance_Notes
CWE Content Team	MITRE	2023-04-27 +00:00	updated Relationships
CWE Content Team	MITRE	2023-06-29 +00:00	updated Mapping_Notes
CWE Content Team	MITRE	2025-12-11 +00:00	updated Weakness_Ordinalities

CWE-1315 詳細

CWE-1315