CWE-1312 Base Borrador

Missing Protection for Mirrored Regions in On-Chip Fabric Firewall

An on-chip fabric firewall fails to apply its security rules to mirrored memory or MMIO regions, only protecting the primary address range. This allows attackers to bypass read/write restrictions by…

Definición

What is CWE-1312?

An on-chip fabric firewall fails to apply its security rules to mirrored memory or MMIO regions, only protecting the primary address range. This allows attackers to bypass read/write restrictions by targeting the unprotected mirrored copies.
Many on-chip fabrics use mirrored memory regions—duplicate copies of original data—to provide redundancy and fault tolerance. However, a critical oversight occurs when the fabric's firewall enforces access controls only on the primary region and neglects to extend those same protections to the mirrored copies. This creates a security gap where the mirrored regions become unprotected backdoors to the same sensitive data. Attackers can exploit this gap to completely bypass the intended security policy. By simply reading from or writing to the mirrored address, they can leak confidential information from the original region or corrupt its data, undermining the firewall's entire purpose. To prevent this, any firewall rule for a primary memory region must be automatically and consistently applied to all of its mirrored counterparts.
Impacto en el mundo real

Real-world CVEs caused by CWE-1312

Todavía no hay CVEs públicos enlazados a esta CWE en el catálogo de MITRE.

Cómo lo explotan los atacantes

Ruta del atacante paso a paso

  1. 1

    A memory-controller IP block is connected to the on-chip fabric in a System on Chip (SoC). The memory controller is configured to divide the memory into four parts: one original and three mirrored regions inside the memory. The upper two bits of the address indicate which region is being addressed. 00 indicates the original region and 01, 10, and 11 are used to address the mirrored regions. All four regions operate in a lock-step manner and are always synchronized. The firewall in the on-chip fabric is programmed to protect the assets in the memory.

  2. 2

    The firewall only protects the original range but not the mirrored regions.

  3. 3

    The attacker (as an unprivileged user) sends a write transaction to the mirrored region. The mirrored region has an address with the upper two bits set to "10" and the remaining bits of the address pointing to an asset. The firewall does not block this write transaction. Once the write is successful, contents in the protected-memory region are also updated. Thus, the attacker can bypass existing, memory protections.

  4. 4

    Firewall should protect mirrored regions.

Ejemplo de código vulnerable

Vulnerable pseudo

MITRE no ha publicado un ejemplo de código para esta CWE. El patrón siguiente es ilustrativo — consulta Recursos para referencias canónicas.

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

Secure pseudo

Seguro 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.
Lista de prevención

How to prevent CWE-1312

  • Architecture and Design The fabric firewall should apply the same protections as the original region to the mirrored regions.
  • Implementation The fabric firewall should apply the same protections as the original region to the mirrored regions.
Señales de detección

How to detect CWE-1312

Manual Dynamic Analysis High

Using an external debugger, send write transactions to mirrored regions to test if original, write-protected regions are modified. Similarly, send read transactions to mirrored regions to test if the original, read-protected signals can be read.

Auto-corrección de Plexicus

Plexicus detecta automáticamente CWE-1312 y abre un PR de corrección en menos de 60 segundos.

Codex Remedium escanea cada commit, identifica esta debilidad concreta y entrega un pull request listo para revisión con el parche. Sin tickets. Sin traspasos.

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Preguntas frecuentes

Frequently asked questions

¿Qué es CWE-1312?

An on-chip fabric firewall fails to apply its security rules to mirrored memory or MMIO regions, only protecting the primary address range. This allows attackers to bypass read/write restrictions by targeting the unprotected mirrored copies.

¿Qué gravedad tiene CWE-1312?

MITRE no ha publicado una calificación de probabilidad de explotación para esta debilidad. Trátala como de impacto medio hasta que tu modelo de amenazas demuestre lo contrario.

¿Qué lenguajes o plataformas se ven afectados por CWE-1312?

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

¿Cómo puedo prevenir CWE-1312?

The fabric firewall should apply the same protections as the original region to the mirrored regions. The fabric firewall should apply the same protections as the original region to the mirrored regions.

¿Cómo detecta y corrige Plexicus CWE-1312?

El motor SAST de Plexicus detecta la firma de flujo de datos para CWE-1312 en cada commit. Cuando hay coincidencia, nuestro agente Codex Remedium abre un PR de corrección con el código corregido, las pruebas y un resumen de una línea para el revisor.

¿Dónde puedo aprender más sobre CWE-1312?

MITRE publica la definición canónica en https://cwe.mitre.org/data/definitions/1312.html. También puedes consultar la documentación de OWASP y NIST para guías relacionadas.

Debilidades relacionadas

Weaknesses related to CWE-1312

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Recursos

Further reading

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