CVE-2018-18056: Infoleak
First published: Tue Aug 20 2019(Updated: )
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."
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Ti Tm4c123 Firmware | ||
| Ti Tm4c123 | ||
| Ti Tm4c129 Firmware | ||
| Ti Tm4c129 |
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Reference Links
Frequently Asked Questions
What is CVE-2018-18056?
CVE-2018-18056 is a vulnerability discovered in the Texas Instruments (TI) TM4C, MSP432E and MSP432P microcontroller series that allows single-stepping and the use of breakpoints in XOM-protected flash memory.
How does CVE-2018-18056 affect TI TM4C123 firmware?
CVE-2018-18056 affects TI TM4C123 firmware by allowing single-stepping and the use of breakpoints in XOM-protected flash memory.
Does CVE-2018-18056 affect TI TM4C123 microcontroller?
No, CVE-2018-18056 does not affect TI TM4C123 microcontroller as it is marked as not-vulnerable.
How does CVE-2018-18056 affect TI TM4C129 firmware?
CVE-2018-18056 affects TI TM4C129 firmware by allowing single-stepping and the use of breakpoints in XOM-protected flash memory.
Does CVE-2018-18056 affect TI TM4C129 microcontroller?
No, CVE-2018-18056 does not affect TI TM4C129 microcontroller as it is marked as not-vulnerable.
What is the severity of CVE-2018-18056?
The severity of CVE-2018-18056 is medium with a severity value of 4.6.
What is the Common Weakness Enumeration (CWE) ID for CVE-2018-18056?
The Common Weakness Enumeration (CWE) ID for CVE-2018-18056 is 200.
Where can I find more information about CVE-2018-18056?
You can find more information about CVE-2018-18056 at the following references: [Reference 1](https://www.usenix.org/conference/woot19/presentation/schink) and [Reference 2](https://www.usenix.org/system/files/woot19-paper_schink.pdf).
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