Texas Instruments TM4C Protected Memory information disclosure

Summaryinfo

A vulnerability was found in Texas Instruments TM4C. It has been classified as critical. Affected by this issue is some unknown functionality of the component Protected Memory. This manipulation causes information disclosure. This vulnerability appears as CVE-2018-18056. It is feasible to perform the attack on the physical device. There is no available exploit.

Detailsinfo

A vulnerability classified as critical was found in Texas Instruments TM4C (unknown version). Affected by this vulnerability is an unknown code block of the component Protected Memory. The manipulation with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

An issue was discovered in the Texas Instruments (TI) TM4C microcontroller series, such as the TM4C123. 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."

The weakness was presented 08/20/2019. This vulnerability is known as CVE-2018-18056 since 10/08/2018. Attacking locally is a requirement. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• Texas Instruments

Name

• TM4C

CPE 2.3info

• 🔍

CPE 2.2info

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