CWE-1312

Missing Protection for Mirrored Regions in On-Chip Fabric Firewall
AI Translation Available

The firewall in an on-chip fabric protects the main addressed region, but it does not protect any mirrored memory or memory-mapped-IO (MMIO) regions.

Status
draft
Abstraction
base

Few fabrics mirror memory and address ranges, where mirrored regions contain copies of the original data. This redundancy is used to achieve fault tolerance. Whatever protections the fabric firewall implements for the original region should also apply to the mirrored regions. If not, an attacker could bypass existing read/write protections by reading from/writing to the mirrored regions to leak or corrupt the original data.

Common Consequences

confidentiality integrity access control
Impacts
modify memory read memory bypass protection mechanism

Detection Methods

manual dynamic analysis

Potential Mitigations

Phases:
architecture and design implementation
Descriptions:
• The fabric firewall should apply the same protections as the original region to the mirrored regions.