CWE-1312: Missing Protection for Mirrored Regions in On-Chip Fabric Firewall
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.
How it's found
Missing Protection for Mirrored Regions in On-Chip Fabric Firewall is typically found by tracing untrusted input from where it enters the system to the point where it is used without the check or neutralization this weakness describes, combining manual code review with dynamic testing.
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.
Consequences
- Modify Memory, Read Memory, Bypass Protection Mechanism
Mitigations
- 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.
Where this fits in a TurboPentest engagement
This weakness is not covered by the automated black-box pentest. IntegSec pentesters cover it in a manual engagement.
Frequently asked questions
What is CWE-1312?
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.
How do you find Missing Protection for Mirrored Regions in On-Chip Fabric Firewall?
Missing Protection for Mirrored Regions in On-Chip Fabric Firewall is typically found by tracing untrusted input from where it enters the system to the point where it is used without the check or neutralization this weakness describes, combining manual code review with dynamic testing.
What is the impact of CWE-1312?
Modify Memory, Read Memory, Bypass Protection Mechanism
Does TurboPentest test for Missing Protection for Mirrored Regions in On-Chip Fabric Firewall?
This weakness is not covered by the automated black-box pentest. IntegSec pentesters cover it in a manual engagement.
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Written and reviewed by
Michel Chamberland - Founder & CEO, IntegSec
CISSP, OSCP, OSCE, CEH, GIAC, CCSK · 20+ years in offensive security
Michel has spent 20+ years on offensive security teams including IBM X-Force Red and Trustwave SpiderLabs, leading penetration tests, red team engagements, and breach response for Fortune 500 customers. He is the founder of IntegSec and the architect of TurboPentest.
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