CWE-1315: 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.
How it's found
Improper Setting of Bus Controlling Capability in Fabric End-point 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.
To support reusability, certain fabric interfaces and end points provide a configurable register bit that allows IP blocks connected to the controller to access other peripherals connected to the fabric. This allows the end point to be used with devices that function as a controller or responder. If this bit is set by default in hardware, or if firmware incorrectly sets it later, a device intended to be a responder on a fabric is now capable of controlling transactions to other devices and might compromise system security.
Consequences
- Modify Memory, Read Memory, Bypass Protection Mechanism
Mitigations
- 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.
- 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.
- 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.
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-1315?
The bus controller enables bits in the fabric end-point to allow responder devices to control transactions on the fabric.
How do you find Improper Setting of Bus Controlling Capability in Fabric End-point?
Improper Setting of Bus Controlling Capability in Fabric End-point 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-1315?
Modify Memory, Read Memory, Bypass Protection Mechanism
Does TurboPentest test for Improper Setting of Bus Controlling Capability in Fabric End-point?
This weakness is not covered by the automated black-box pentest. IntegSec pentesters cover it in a manual engagement.
Related CWEs
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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