CWE-1318 Base Incomplet

Missing Support for Security Features in On-chip Fabrics or Buses

This vulnerability occurs when the communication channels (fabrics or buses) within a chip lack built-in or enabled security features, such as privilege separation or access controls, leaving data…

Définition

What is CWE-1318?

This vulnerability occurs when the communication channels (fabrics or buses) within a chip lack built-in or enabled security features, such as privilege separation or access controls, leaving data transfers unprotected.

Many on-chip communication systems, especially simpler or low-power designs, are built solely for moving data and lack interfaces to carry critical security attributes like privilege levels or device identity from a master component (like a CPU) to a slave (like a peripheral). Without these dedicated signals, the fabric cannot enforce security policies, making it unsafe for transporting any sensitive security metadata. Even when a bus specification includes optional security signaling, these features are often left unconnected or disabled when the hardware design is generated. Consequently, any peripheral that handles security-sensitive assets should not be connected directly to such a bus unless robust access control is implemented at an earlier point, such as a bridge or intermediary module, before transactions enter the insecure fabric.

Impact réel

Real-world CVEs caused by CWE-1318

Aucune référence CVE publique n'est liée à ce CWE dans le catalogue MITRE pour le moment.

Comment les attaquants l'exploitent

Parcours de l'attaquant étape par étape

1
Several systems on chips (SoCs) use the Advanced-Microcontroller Bus Architecture (AMBA) Advanced-Peripheral Bus (APB) protocol. APB is a simple, low-power bus and uses the PPROT[2:0] bits to indicate the security state of the bus masters ;PPROT[0] indicates privilege, PPROT[1] indicates secure/non-secure transaction, and PPROT[2] indicates instruction/data. Assume that there is no fabric bridge in the SoC. One of the slaves, the power-management unit, contains registers that store the thermal-shutdown limits.
2
The APB bus is used to connect several bus masters, each with a unique and immutable hardware identity, to several slaves. For a CPU supporting 8 potential identities (each with varying privilege levels), 16 types of outgoing transactions can be made--8 read transactions with each supported privilege level and 8 write transactions with each supported privilege level.
3
Since APB PPROT can only support up to 8 transaction types, access-control checks cannot be performed on transactions going to the slaves at the right granularity for all possible transaction types. Thus, potentially, user code running on the CPU could maliciously corrupt the thermal-shutdown-configuration registers to burn the device, resulting in permanent denial of service.
4
In this scenario, only peripherals that need access protection from 8 of the 16 possible transaction types can be connected to the APB bus. Peripherals that require protection from the remaining 8 transaction types can be connected to a different APB bus. Alternatively, a bridge could be implemented to handle such complex scenarios before forwarding traffic to the APB bus.
5
The Open-Core-Protocol (OCP) fabric supports two configurable, width-optional signals for transporting security attributes: MReqInfo and SRespInfo. MReqInfo is used to transport security attributes from bus master to slave, and SRespInfo is used to transport security attributes from slave to bus master. An SoC uses OCP to connect several bus masters, each with a unique and immutable hardware identity, to several slaves. One of the bus masters, the CPU, reports the privilege level (user or super user) in addition to the unique identity. One of the slaves, the power-management unit, contains registers that store the thermal-shutdown limits.

Exemple de code vulnérable

Vulnerable pseudo

MITRE n'a pas publié d'exemple de code pour ce CWE. Le motif ci-dessous est illustratif — voir Ressources pour les références canoniques.

Vulnérable pseudo

// Example pattern — see MITRE for the canonical references.
function handleRequest(input) {
  // Untrusted input flows directly into the sensitive sink.
  return executeUnsafe(input);
}

Exemple de code sécurisé

Secure pseudo

Sécurisé pseudo

// Validate, sanitize, or use a safe API before reaching the sink.
function handleRequest(input) {
  const safe = validateAndEscape(input);
  return executeWithGuards(safe);
}

What changed: the unsafe sink is replaced (or the input is validated/escaped) so the same payload no longer triggers the weakness.

Liste de contrôle de prévention

How to prevent CWE-1318

Architecture and Design If fabric does not support security features, implement security checks in a bridge or any component that is between the master and the fabric. Alternatively, connect all fabric slaves that do not have any security assets under one such fabric and connect peripherals with security assets to a different fabric that supports security features.

Signaux de détection

How to detect CWE-1318

Architecture or Design Review High

Review the fabric specification and ensure that it contains signals to transfer security-sensitive signals.

Manual Static Analysis - Source Code High

Lack of security features can also be confirmed through manual RTL review of the fabric RTL.

Correction automatique Plexicus

Plexicus détecte automatiquement CWE-1318 et ouvre une PR de correction en moins de 60 secondes.

Codex Remedium analyse chaque commit, identifie cette faiblesse précise et livre une pull request prête à être relue avec le correctif. Pas de tickets. Pas de transferts.

Obtenir une démo Essayer Plexicus gratuitement

Questions fréquentes

Frequently asked questions

Qu'est-ce que CWE-1318 ?

Quelle est la gravité de CWE-1318 ?

MITRE n'a pas publié de note de probabilité d'exploitation pour cette faiblesse. Traitez-la comme un impact moyen jusqu'à ce que votre modèle de menace prouve le contraire.

Quels langages ou plateformes sont affectés par CWE-1318 ?

MITRE lists the following affected platforms: Not OS-Specific, Not Architecture-Specific, Processor Hardware, Not Technology-Specific.

Comment puis-je prévenir CWE-1318 ?

If fabric does not support security features, implement security checks in a bridge or any component that is between the master and the fabric. Alternatively, connect all fabric slaves that do not have any security assets under one such fabric and connect peripherals with security assets to a different fabric that supports security features.

Comment Plexicus détecte et corrige CWE-1318 ?

Le moteur SAST de Plexicus reconnaît la signature de flux de données de CWE-1318 à chaque commit. Lorsqu'une correspondance est trouvée, notre agent Codex Remedium ouvre une PR de correction avec le code corrigé, les tests et un résumé d'une ligne pour le relecteur.

Où puis-je en savoir plus sur CWE-1318 ?

MITRE publie la définition canonique à https://cwe.mitre.org/data/definitions/1318.html. Vous pouvez également consulter la documentation OWASP et NIST pour des conseils adjacents.

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