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."
History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2019-08-20T16:22:18

Updated: 2024-08-05T11:01:15.083Z

Reserved: 2018-10-08T00:00:00

Link: CVE-2018-18056

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2019-08-20T17:15:11.087

Modified: 2019-09-12T18:15:10.990

Link: CVE-2018-18056

cve-icon Redhat

No data.