CWE - CWE-1274: Improper Access Control for Volatile Memory Containing Boot Code (4.12)

Weakness ID: 1274

Abstraction: Base
Structure: Simple

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Description

The product conducts a secure-boot process that transfers bootloader code from Non-Volatile Memory (NVM) into Volatile Memory (VM), but it does not have sufficient access control or other protections for the Volatile Memory.

Extended Description

Adversaries could bypass the secure-boot process and execute their own untrusted, malicious boot code.

As a part of a secure-boot process, the read-only-memory (ROM) code for a System-on-Chip (SoC) or other system fetches bootloader code from Non-Volatile Memory (NVM) and stores the code in Volatile Memory (VM), such as dynamic, random-access memory (DRAM) or static, random-access memory (SRAM). The NVM is usually external to the SoC, while the VM is internal to the SoC. As the code is transferred from NVM to VM, it is authenticated by the SoC's ROM code.

If the volatile-memory-region protections or access controls are insufficient to prevent modifications from an adversary or untrusted agent, the secure boot may be bypassed or replaced with the execution of an adversary's code.

Relationships

This table shows the weaknesses and high level categories that are related to this weakness. These relationships are defined as ChildOf, ParentOf, MemberOf and give insight to similar items that may exist at higher and lower levels of abstraction. In addition, relationships such as PeerOf and CanAlsoBe are defined to show similar weaknesses that the user may want to explore.

Relevant to the view "Research Concepts" (CWE-1000)

Nature	Type	ID	Name
ChildOf	Pillar - a weakness that is the most abstract type of weakness and represents a theme for all class/base/variant weaknesses related to it. A Pillar is different from a Category as a Pillar is still technically a type of weakness that describes a mistake, while a Category represents a common characteristic used to group related things.	284	Improper Access Control

Relevant to the view "Hardware Design" (CWE-1194)

Nature	Type	ID	Name
MemberOf	Category - a CWE entry that contains a set of other entries that share a common characteristic.	1196	Security Flow Issues

Modes Of Introduction

The different Modes of Introduction provide information about how and when this weakness may be introduced. The Phase identifies a point in the life cycle at which introduction may occur, while the Note provides a typical scenario related to introduction during the given phase.

Phase	Note
Architecture and Design	This weakness can be introduced during hardware architecture or design but can be identified later during testing.

Applicable Platforms

This listing shows possible areas for which the given weakness could appear. These may be for specific named Languages, Operating Systems, Architectures, Paradigms, Technologies, or a class of such platforms. The platform is listed along with how frequently the given weakness appears for that instance.

Languages

Class: Not Language-Specific (Undetermined Prevalence)

Operating Systems

Class: Not OS-Specific (Undetermined Prevalence)

Architectures

Class: Not Architecture-Specific (Undetermined Prevalence)

Technologies

Class: Not Technology-Specific (Undetermined Prevalence)

Common Consequences

This table specifies different individual consequences associated with the weakness. The Scope identifies the application security area that is violated, while the Impact describes the negative technical impact that arises if an adversary succeeds in exploiting this weakness. The Likelihood provides information about how likely the specific consequence is expected to be seen relative to the other consequences in the list. For example, there may be high likelihood that a weakness will be exploited to achieve a certain impact, but a low likelihood that it will be exploited to achieve a different impact.

Scope	Impact	Likelihood
Access Control Integrity	Technical Impact: Modify Memory; Execute Unauthorized Code or Commands; Gain Privileges or Assume Identity	High

Demonstrative Examples

Example 1

A typical SoC secure boot's flow includes fetching the next piece of code (i.e., the boot loader) from NVM (e.g., serial, peripheral interface (SPI) flash), and transferring it to DRAM/SRAM volatile, internal memory, which is more efficient.

(bad code)

The volatile-memory protections or access controls are insufficient.

The memory from where the boot loader executes can be modified by an adversary.

(good code)

A good architecture should define appropriate protections or access controls to prevent modification by an adversary or untrusted agent, once the bootloader is authenticated.

Observed Examples

Reference	Description
CVE-2019-2267	Locked memory regions may be modified through other interfaces in a secure-boot-loader image due to improper access control.

Potential Mitigations

Phase: Architecture and Design

Ensure that the design of volatile-memory protections is enough to prevent modification from an adversary or untrusted code.

Phase: Testing

Test the volatile-memory protections to ensure they are safe from modification or untrusted code.

Weakness Ordinalities

Ordinality	Description
Primary	(where the weakness exists independent of other weaknesses)

Detection Methods

Manual Analysis

Ensure the volatile memory is lockable or has locks. Ensure the volatile memory is locked for writes from untrusted agents or adversaries. Try modifying the volatile memory from an untrusted agent, and ensure these writes are dropped.

Effectiveness: High

Manual Analysis

Analyze the device using the following steps:

1) Identify all fabric master agents that are active during system Boot Flow when initial code is loaded from Non-volatile storage to volatile memory.

2) Identify the volatile memory regions that are used for storing loaded system executable program.

3) During system boot, test programming the identified memory regions in step 2 from all the masters identified in step 1.

Only trusted masters should be allowed to write to the memory regions. For example, pluggable device peripherals should not have write access to program load memory regions.

Effectiveness: Moderate

Memberships

This MemberOf Relationships table shows additional CWE Categories and Views that reference this weakness as a member. This information is often useful in understanding where a weakness fits within the context of external information sources.

Nature	Type	ID	Name
MemberOf	View - a subset of CWE entries that provides a way of examining CWE content. The two main view structures are Slices (flat lists) and Graphs (containing relationships between entries).	1343	Weaknesses in the 2021 CWE Most Important Hardware Weaknesses List
MemberOf	Category - a CWE entry that contains a set of other entries that share a common characteristic.	1396	Comprehensive Categorization: Access Control

Vulnerability Mapping Notes

Usage: Allowed

(this CWE ID could be used to map to real-world vulnerabilities)

Reason: Acceptable-Use

Rationale:

This CWE entry is at the Base level of abstraction, which is a preferred level of abstraction for mapping to the root causes of vulnerabilities.

Comments:

Carefully read both the name and description to ensure that this mapping is an appropriate fit. Do not try to 'force' a mapping to a lower-level Base/Variant simply to comply with this preferred level of abstraction.

Related Attack Patterns

CAPEC-ID	Attack Pattern Name
CAPEC-456	Infected Memory
CAPEC-679	Exploitation of Improperly Configured or Implemented Memory Protections

Content History

Submissions
Submission Date	Submitter	Organization
2020-04-25 (CWE 4.1, 2020-02-24)	Arun Kanuparthi, Hareesh Khattri, Parbati Kumar Manna, Narasimha Kumar V Mangipudi	Intel Corporation
2020-04-25 (CWE 4.1, 2020-02-24)
Contributions
Contribution Date	Contributor	Organization
2021-10-20	Narasimha Kumar V Mangipudi	Lattice Semiconductor
2021-10-20	suggested content improvements
2021-10-22	Hareesh Khattri	Intel Corporation
2021-10-22	provided detection method
Modifications
Modification Date	Modifier	Organization
2020-08-20	CWE Content Team	MITRE
2020-08-20	updated Demonstrative_Examples, Description, Related_Attack_Patterns
2021-10-28	CWE Content Team	MITRE
2021-10-28	updated Common_Consequences, Demonstrative_Examples, Description, Detection_Factors, Maintenance_Notes, Name, Observed_Examples, Potential_Mitigations, Relationships, Weakness_Ordinalities
2022-04-28	CWE Content Team	MITRE
2022-04-28	updated Related_Attack_Patterns
2023-01-31	CWE Content Team	MITRE
2023-01-31	updated Related_Attack_Patterns
2023-04-27	CWE Content Team	MITRE
2023-04-27	updated Relationships
2023-06-29	CWE Content Team	MITRE
2023-06-29	updated Mapping_Notes
Previous Entry Names
Change Date	Previous Entry Name
2021-10-28	Insufficient Protections on the Volatile Memory Containing Boot Code


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Common Weakness Enumeration

CWE-1274: Improper Access Control for Volatile Memory Containing Boot Code

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