CWE-1224 - Improper Restriction of Write-Once Bit Fields

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Description

The hardware design control register “sticky bits” or write-once bit fields are improperly implemented, such that they can be reprogrammed by software.

Modes of Introduction:

– Architecture and Design

Related Weaknesses

CWE-284

Consequences

Confidentiality, Integrity, Availability, Access Control: Varies by Context

System configuration cannot be programmed in a secure way.

Potential Mitigations

Phase: Architecture and Design

Description:

During hardware design all register write-once or sticky fields must be evaluated for proper configuration.

Phase: Testing

Description:

The testing phase should use automated tools to test that values are not reprogrammable and that write-once fields lock on writing zeros.

CVE References

InCWE- 1224, Improper Restriction of Write-Once Bit Fields

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