CVE-2018-12633

{"id": "CVE-2018-12633", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 6.3, "accessVector": "LOCAL", "vectorString": "AV:L/AC:M/Au:N/C:C/I:N/A:C", "authentication": "NONE", "integrityImpact": "NONE", "accessComplexity": "MEDIUM", "availabilityImpact": "COMPLETE", "confidentialityImpact": "COMPLETE"}, "acInsufInfo": false, "impactScore": 9.2, "baseSeverity": "MEDIUM", "obtainAllPrivilege": false, "exploitabilityScore": 3.4, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV30": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.0", "baseScore": 6.3, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 1.0}]}, "published": "2018-06-22T00:29:00.270", "references": [{"url": "http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=bd23a7269834dc7c1f93e83535d16ebc44b75eba", "tags": ["Patch", "Vendor Advisory"], "source": "cve@mitre.org"}, {"url": "https://bugzilla.kernel.org/show_bug.cgi?id=200131", "tags": ["Issue Tracking", "Vendor Advisory"], "source": "cve@mitre.org"}, {"url": "https://github.com/torvalds/linux/commit/bd23a7269834dc7c1f93e83535d16ebc44b75eba", "tags": ["Patch", "Third Party Advisory"], "source": "cve@mitre.org"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-362"}]}], "descriptions": [{"lang": "en", "value": "An issue was discovered in the Linux kernel through 4.17.2. vbg_misc_device_ioctl() in drivers/virt/vboxguest/vboxguest_linux.c reads the same user data twice with copy_from_user. The header part of the user data is double-fetched, and a malicious user thread can tamper with the critical variables (hdr.size_in and hdr.size_out) in the header between the two fetches because of a race condition, leading to severe kernel errors, such as buffer over-accesses. This bug can cause a local denial of service and information leakage."}, {"lang": "es", "value": "Se ha descubierto un problema en el kernel de Linux hasta la versi\u00f3n 4.17.2. vbg_misc_device_ioctl() en drivers/virt/vboxguest/vboxguest_linux.c lee los mismos datos de usuario dos veces con copy_from_user. La cabecera de los datos de usuario es de tipo double-fetch y un hilo de usuario malicioso puede falsificar las variables cr\u00edticas (hdr.size_in y hdr.size_out) en la cabecera entre los dos fetch debido a una condici\u00f3n de carrera. Esto desemboca en varios errores del kernel, como accesos espec\u00edficos al b\u00fafer. Este error puede provocar una denegaci\u00f3n de servicio (DoS) local y una fuga de informaci\u00f3n."}], "lastModified": "2018-08-21T15:42:37.667", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A7B1384E-833A-4422-A6B1-F80FB3EA20B6", "versionEndIncluding": "4.17.2"}], "operator": "OR"}]}], "sourceIdentifier": "cve@mitre.org"}