CVE-2018-18056

{"id": "CVE-2018-18056", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 2.1, "accessVector": "LOCAL", "vectorString": "AV:L/AC:L/Au:N/C:P/I:N/A:N", "authentication": "NONE", "integrityImpact": "NONE", "accessComplexity": "LOW", "availabilityImpact": "NONE", "confidentialityImpact": "PARTIAL"}, "acInsufInfo": false, "impactScore": 2.9, "baseSeverity": "LOW", "obtainAllPrivilege": false, "exploitabilityScore": 3.9, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV30": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.0", "baseScore": 4.6, "attackVector": "PHYSICAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 3.6, "exploitabilityScore": 0.9}]}, "published": "2019-08-20T17:15:11.087", "references": [{"url": "https://www.usenix.org/conference/woot19/presentation/schink", "tags": ["Technical Description", "Third Party Advisory"], "source": "cve@mitre.org"}, {"url": "https://www.usenix.org/system/files/woot19-paper_schink.pdf", "tags": ["Technical Description", "Third Party Advisory"], "source": "cve@mitre.org"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-200"}]}], "descriptions": [{"lang": "en", "value": "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.\""}, {"lang": "es", "value": "Se detecto un problema en las series de microcontroladores TM4C, MSP432E y MSP432P de Texas Instruments (TI). La implementaci\u00f3n de eXecute-Only-Memory (XOM) evita las lecturas de c\u00f3digo en la memoria protegida mediante la generaci\u00f3n de errores de bus. Sin embargo, se permite un solo paso y el uso de puntos de interrupci\u00f3n en la memoria flash protegida por XOM. Como consecuencia, es posible ejecutar instrucciones \u00fanicas con estados arbitrarios del sistema (por ejemplo, registros, indicadores de estado y contenido SRAM) y observar los cambios de estado producidos por la instrucci\u00f3n desconocida. Un atacante podr\u00eda explotar esta vulnerabilidad ejecutando instrucciones protegidas y desconocidas con estados espec\u00edficos del sistema y observando los cambios de estado. Sobre la base de la informaci\u00f3n recopilada, es posible realizar ingenier\u00eda inversa de las instrucciones ejecutadas. El procesador act\u00faa como una especie de \"instruction oracle.\""}], "lastModified": "2019-09-12T18:15:10.990", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:ti:tm4c123_firmware:-:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C27D6975-5D56-45FD-A53A-6F136D3EBD8D"}], "operator": "OR"}, {"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:h:ti:tm4c123:-:*:*:*:*:*:*:*", "vulnerable": false, "matchCriteriaId": "C7F9060E-4C74-4143-A97C-C07EB641C399"}], "operator": "OR"}], "operator": "AND"}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:ti:tm4c129_firmware:-:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "77E4B816-0F19-4554-AA37-F627D214EF58"}], "operator": "OR"}, {"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:h:ti:tm4c129:-:*:*:*:*:*:*:*", "vulnerable": false, "matchCriteriaId": "C653611B-4D19-4A97-A02A-92F57F55D957"}], "operator": "OR"}], "operator": "AND"}], "sourceIdentifier": "cve@mitre.org"}