// For flags

CVE-2018-18056

 

Severity Score

4.6
*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

An issue was discovered in the Texas Instruments (TI) TM4C, MSP432E and MSP432P microcontroller series. The eXecute-Only-Memory (XOM) implementation prevents code read-outs on protected memory by generating bus faults. However, single-stepping and using breakpoints is allowed in XOM-protected flash memory. As a consequence, it is possible to execute single instructions with arbitrary system states (e.g., registers, status flags, and SRAM content) and observe the state changes produced by the unknown instruction. An attacker could exploit this vulnerability by executing protected and unknown instructions with specific system states and observing the state changes. Based on the gathered information, it is possible to reverse-engineer the executed instructions. The processor acts as a kind of "instruction oracle."

Se detecto un problema en las series de microcontroladores TM4C, MSP432E y MSP432P de Texas Instruments (TI). La implementación de eXecute-Only-Memory (XOM) evita las lecturas de código en la memoria protegida mediante la generación de errores de bus. Sin embargo, se permite un solo paso y el uso de puntos de interrupción en la memoria flash protegida por XOM. Como consecuencia, es posible ejecutar instrucciones únicas con estados arbitrarios del sistema (por ejemplo, registros, indicadores de estado y contenido SRAM) y observar los cambios de estado producidos por la instrucción desconocida. Un atacante podría explotar esta vulnerabilidad ejecutando instrucciones protegidas y desconocidas con estados específicos del sistema y observando los cambios de estado. Sobre la base de la información recopilada, es posible realizar ingeniería inversa de las instrucciones ejecutadas. El procesador actúa como una especie de "instruction oracle."

*Credits: N/A
CVSS Scores
Attack Vector
Physical
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Attack Vector
Local
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
None
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2018-10-08 CVE Reserved
  • 2019-08-20 CVE Published
  • 2023-03-08 EPSS Updated
  • 2024-08-05 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Ti
Search vendor "Ti"
Tm4c123 Firmware
Search vendor "Ti" for product "Tm4c123 Firmware"
--
Affected
in Ti
Search vendor "Ti"
Tm4c123
Search vendor "Ti" for product "Tm4c123"
--
Safe
Ti
Search vendor "Ti"
Tm4c129 Firmware
Search vendor "Ti" for product "Tm4c129 Firmware"
--
Affected
in Ti
Search vendor "Ti"
Tm4c129
Search vendor "Ti" for product "Tm4c129"
--
Safe