CWE-1319: Improper Protection against Electromagnetic Fault Injection (EM-FI)
Weakness ID: 1319
Vulnerability Mapping:ALLOWEDThis CWE ID may be used to map to real-world vulnerabilities Abstraction:
BaseBase - a weakness that is still mostly independent of a resource or technology, but with sufficient details to provide specific methods for detection and prevention. Base level weaknesses typically describe issues in terms of 2 or 3 of the following dimensions: behavior, property, technology, language, and resource.
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Description
The device is susceptible to electromagnetic fault injection attacks, causing device internal information to be compromised or security mechanisms to be bypassed.
Extended Description
Electromagnetic fault injection may allow an attacker to locally and dynamically modify the signals (both internal and external) of an integrated circuit. EM-FI attacks consist of producing a local, transient magnetic field near the device, inducing current in the device wires. A typical EMFI setup is made up of a pulse injection circuit that generates a high current transient in an EMI coil, producing an abrupt magnetic pulse which couples to the target producing faults in the device, which can lead to:
Bypassing security mechanisms such as secure JTAG or Secure Boot
Leaking device information
Modifying program flow
Perturbing secure hardware modules (e.g. random number generators)
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.
Impact
Details
Modify Memory; Read Memory; Gain Privileges or Assume Identity; Bypass Protection Mechanism; Execute Unauthorized Code or Commands
1. Redundancy - By replicating critical operations and comparing the two outputs can help indicate whether a fault has been injected.
2. Error detection and correction codes - Gay, Mael, et al. proposed a new scheme that not only detects faults injected by a malicious adversary but also automatically corrects single nibble/byte errors introduced by low-multiplicity faults.
3. Fail by default coding - When checking conditions (switch or if) check all possible cases and fail by default because the default case in a switch (or the else part of a cascaded if-else-if construct) is used for dealing with the last possible (and valid) value without checking. This is prone to fault injection because this alternative is easily selected as a result of potential data manipulation [REF-1141].
4. Random Behavior - adding random delays before critical operations, so that timing is not predictable.
5. Program Flow Integrity Protection - The program flow can be secured by integrating run-time checking aiming at detecting control flow inconsistencies. One such example is tagging the source code to indicate the points not to be bypassed [REF-1147].
6. Sensors - Usage of sensors can detect variations in voltage and current.
7. Shields - physical barriers to protect the chips from malicious manipulation.
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" (View-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.
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
Implementation
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)
Power Management Hardware
(Undetermined Prevalence)
Processor Hardware
(Undetermined Prevalence)
Test/Debug Hardware
(Undetermined Prevalence)
Sensor Hardware
(Undetermined Prevalence)
Demonstrative Examples
Example 1
In many devices, security related information is stored in fuses. These fuses are loaded into shadow registers at boot time. Disturbing this transfer phase with EM-FI can lead to the shadow registers storing erroneous values potentially resulting in reduced security.
Colin O'Flynn has demonstrated an attack scenario which uses electro-magnetic glitching during booting to bypass security and gain read access to flash, read and erase access to shadow memory area (where the private password is stored). Most devices in the MPC55xx and MPC56xx series that include the Boot Assist Module (BAM) (a serial or CAN bootloader mode) are susceptible to this attack. In this paper, a GM ECU was used as a real life target. While the success rate appears low (less than 2 percent), in practice a success can be found within 1-5 minutes once the EMFI tool is setup. In a practical scenario, the author showed that success can be achieved within 30-60 minutes from a cold start.
Selected Observed
Examples
Note: this is a curated list of examples for users to understand the variety of ways in which this
weakness can be introduced. It is not a complete list of all CVEs that are related to this CWE entry.
Chain: microcontroller system-on-chip uses a register value stored in flash to set product protection state on the memory bus and does not contain protection against fault injection (CWE-1319) which leads to an incorrect initialization of the memory bus (CWE-1419) causing the product to be in an unprotected state.
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
Category - a CWE entry that contains a set of other entries that share a common characteristic.
(this CWE ID may 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.
Notes
Maintenance
This entry is attack-oriented and may require significant modification in future versions, or even deprecation. It is not clear whether there is really a design "mistake" that enables such attacks, so this is not necessarily a weakness and may be more appropriate for CAPEC.
A. Dehbaoui, J. M. Dutertre, B. Robisson, P. Orsatelli, P. Maurine, A. Tria. "Injection of transient faults using electromagnetic pulses. Practical results on a cryptographic system". 2012.
<https://eprint.iacr.org/2012/123.pdf>.
Description
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.
