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CWE-1314 Base Rascunho
Missing Write Protection for Parametric Data Values
This vulnerability occurs when a hardware device fails to protect the scaling parameters used to convert raw sensor readings. Untrusted software can alter these conversion factors, making dangerous…
Definição
What is CWE-1314?
This vulnerability occurs when a hardware device fails to protect the scaling parameters used to convert raw sensor readings. Untrusted software can alter these conversion factors, making dangerous conditions appear safe and potentially leading to hardware damage or system failure.
Hardware systems use sensors to monitor critical limits for temperature, power, voltage, and other operational parameters. Trusted firmware like the BIOS typically sets and protects these safety thresholds. However, the raw data from sensors often needs to be scaled using conversion parameters to produce meaningful values (like degrees Celsius or volts). The core issue is that while the final safety limits are often locked down, these underlying scaling factors are left exposed and writable.
By manipulating these unprotected scaling parameters, an attacker can distort the sensor's reported values. For example, they could make a dangerously high temperature appear within a normal range. This bypasses the intended safety checks, allowing the system to operate outside its safe design limits, which can cause physical damage to components or lead to a complete operational failure.
Impacto no mundo real
Real-world CVEs caused by CWE-1314
-
Kernel can inject faults in computations during the execution of TrustZone leading to information disclosure in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer Electronics Connectivity, Snapdragon Consumer IOT, Snapdragon Industrial IOT, Snapdragon IoT, Snapdragon Mobile, Snapdragon Voice and Music, Snapdragon Wearables, Snapdragon Wired Infrastructure and Networking.
Como os atacantes a exploram
Trajeto do atacante passo a passo
- 1
Identificar um caminho de código que trata input não confiável sem validação.
- 2
Criar um payload que explora o comportamento inseguro — injeção, traversal, overflow ou abuso de lógica.
- 3
Entregar o payload através de um pedido normal e observar a reação da aplicação.
- 4
Iterar até que a resposta exponha dados, execute código do atacante ou escale privilégios.
Exemplo de código vulnerável
Vulnerable Other
Malicious software executes instructions to increase power consumption to the highest possible level while causing the clock frequency to increase to its maximum value. Such a program executing for an extended period of time would likely overheat the device, possibly resulting in permanent damage to the device. A ring, oscillator-based temperature sensor will generally report the sensed value as oscillator frequency rather than degrees centigrade. The temperature sensor will have calibration values that are used to convert the detected frequency into the corresponding temperature in degrees centigrade. Consider a SoC design where the critical maximum temperature limit is set in fuse values to 100C and is not modifiable by software. If the scaled thermal sensor output equals or exceeds this limit, the system is commanded to shut itself down. The thermal sensor calibration values are programmable through registers that are exposed to system software. These registers allow software to affect the converted temperature output such that the output will never exceed the maximum temperature limit.
The sensor frequency value is scaled by applying the function:
```
Sensed Temp = a + b * Sensor Freq
```
where a and b are the programmable calibration data coefficients. Software sets a and b to zero ensuring the sensed temperature is always zero. Exemplo de código seguro
Secure Other
This weakness may be addressed by preventing access to a and b.
The sensor frequency value is scaled by applying the function:
```
Sensed Temp = a + b * Sensor Freq
```
where a and b are the programmable calibration data coefficients. Untrusted software is prevented from changing the values of either a or b, preventing this method of manipulating the temperature. What changed: the unsafe sink is replaced (or the input is validated/escaped) so the same payload no longer triggers the weakness.
Lista de verificação de prevenção
How to prevent CWE-1314
- Architecture and Design Access controls for sensor blocks should ensure that only trusted software is allowed to change threshold limits and sensor parametric data.
Sinais de deteção
How to detect CWE-1314
Executar testes dinâmicos de segurança de aplicações (DAST) contra o endpoint em execução.
Monitorizar os registos em tempo de execução para traços de exceção invulgares, input malformado ou tentativas de contornar a autorização.
Revisão de código: sinalizar qualquer novo código que trate input desta superfície sem usar os ajudantes validados do framework.
O Plexicus deteta automaticamente o CWE-1314 e abre um PR de correção em menos de 60 segundos.
O Codex Remedium analisa cada commit, identifica esta fraqueza exata e entrega um pull request pronto para revisão com o patch. Sem tickets. Sem transferências.
Perguntas frequentes O que é o CWE-1314?
Qual a gravidade do CWE-1314?
Que linguagens ou plataformas são afetadas pelo CWE-1314?
Como posso prevenir o CWE-1314?
Como é que o Plexicus deteta e corrige o CWE-1314?
Onde posso saber mais sobre o CWE-1314?
Frequently asked questions
O que é o CWE-1314?
This vulnerability occurs when a hardware device fails to protect the scaling parameters used to convert raw sensor readings. Untrusted software can alter these conversion factors, making dangerous conditions appear safe and potentially leading to hardware damage or system failure.
Qual a gravidade do CWE-1314?
A MITRE não publicou uma classificação de probabilidade de exploração para esta fraqueza. Trate-a como impacto médio até o seu modelo de ameaças provar o contrário.
Que linguagens ou plataformas são afetadas pelo CWE-1314?
MITRE lists the following affected platforms: Not OS-Specific, Not Architecture-Specific, Sensor Hardware.
Como posso prevenir o CWE-1314?
Access controls for sensor blocks should ensure that only trusted software is allowed to change threshold limits and sensor parametric data.
Como é que o Plexicus deteta e corrige o CWE-1314?
O motor SAST do Plexicus correlaciona a assinatura de fluxo de dados do CWE-1314 em cada commit. Quando é encontrada uma correspondência, o nosso agente Codex Remedium abre um PR de correção com o código corrigido, testes e um resumo de uma linha para o revisor.
Onde posso saber mais sobre o CWE-1314?
A MITRE publica a definição canónica em https://cwe.mitre.org/data/definitions/1314.html. Pode também consultar a documentação da OWASP e do NIST para orientações adjacentes.
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