CVE-2018-6557

{"containers": {"cna": {"affected": [{"product": "base-files", "vendor": "Ubuntu", "versions": [{"lessThan": "10.1ubuntu2.2", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "credits": [{"lang": "en", "value": "Sander Bos"}], "datePublic": "2018-08-21T00:00:00.000Z", "descriptions": [{"lang": "en", "value": "The MOTD update script in the base-files package in Ubuntu 18.04 LTS before 10.1ubuntu2.2, and Ubuntu 18.10 before 10.1ubuntu6 incorrectly handled temporary files. A local attacker could use this issue to cause a denial of service, or possibly escalate privileges if kernel symlink restrictions were disabled."}], "problemTypes": [{"descriptions": [{"description": "Insecure Temporary File", "lang": "en", "type": "text"}]}], "providerMetadata": {"dateUpdated": "2018-08-28T09:57:01.000Z", "orgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc", "shortName": "canonical"}, "references": [{"name": "USN-3748-1", "tags": ["vendor-advisory", "x_refsource_UBUNTU"], "url": "https://usn.ubuntu.com/3748-1/"}, {"name": "1041530", "tags": ["vdb-entry", "x_refsource_SECTRACK"], "url": "http://www.securitytracker.com/id/1041530"}, {"name": "105148", "tags": ["vdb-entry", "x_refsource_BID"], "url": "http://www.securityfocus.com/bid/105148"}], "source": {"discovery": "EXTERNAL"}, "title": "Insecure temporary file use in base-files", "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security@ubuntu.com", "DATE_PUBLIC": "2018-08-21T00:00:00.000Z", "ID": "CVE-2018-6557", "STATE": "PUBLIC", "TITLE": "Insecure temporary file use in base-files"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "base-files", "version": {"version_data": [{"affected": "<", "version_affected": "<", "version_value": "10.1ubuntu2.2"}]}}]}, "vendor_name": "Ubuntu"}]}}, "credit": [{"lang": "eng", "value": "Sander Bos"}], "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "The MOTD update script in the base-files package in Ubuntu 18.04 LTS before 10.1ubuntu2.2, and Ubuntu 18.10 before 10.1ubuntu6 incorrectly handled temporary files. A local attacker could use this issue to cause a denial of service, or possibly escalate privileges if kernel symlink restrictions were disabled."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "Insecure Temporary File"}]}]}, "references": {"reference_data": [{"name": "USN-3748-1", "refsource": "UBUNTU", "url": "https://usn.ubuntu.com/3748-1/"}, {"name": "1041530", "refsource": "SECTRACK", "url": "http://www.securitytracker.com/id/1041530"}, {"name": "105148", "refsource": "BID", "url": "http://www.securityfocus.com/bid/105148"}]}, "source": {"discovery": "EXTERNAL"}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-05T06:10:10.072Z"}, "title": "CVE Program Container", "references": [{"name": "USN-3748-1", "tags": ["vendor-advisory", "x_refsource_UBUNTU", "x_transferred"], "url": "https://usn.ubuntu.com/3748-1/"}, {"name": "1041530", "tags": ["vdb-entry", "x_refsource_SECTRACK", "x_transferred"], "url": "http://www.securitytracker.com/id/1041530"}, {"name": "105148", "tags": ["vdb-entry", "x_refsource_BID", "x_transferred"], "url": "http://www.securityfocus.com/bid/105148"}]}]}, "cveMetadata": {"assignerOrgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc", "assignerShortName": "canonical", "cveId": "CVE-2018-6557", "datePublished": "2018-08-21T16:00:00.000Z", "dateReserved": "2018-02-02T00:00:00.000Z", "dateUpdated": "2024-09-16T18:24:32.413Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

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{"affected": [{"affectedData": [{"product": "base-files", "vendor": "Ubuntu", "versions": [{"lessThan": "10.1ubuntu2.2", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "source": "security@ubuntu.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:base-files_project:base-files:10.1ubuntu2.2:*:*:*:*:*:*:*", "matchCriteriaId": "8A95C549-93EC-4A40-904F-7CFED2A94694", "vulnerable": true}, {"criteria": "cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*", "matchCriteriaId": "23A7C53F-B80F-4E6A-AFA9-58EEA84BE11D", "vulnerable": true}, {"criteria": "cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*", "matchCriteriaId": "07C312A0-CD2C-4B9C-B064-6409B25C278F", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "The MOTD update script in the base-files package in Ubuntu 18.04 LTS before 10.1ubuntu2.2, and Ubuntu 18.10 before 10.1ubuntu6 incorrectly handled temporary files. A local attacker could use this issue to cause a denial of service, or possibly escalate privileges if kernel symlink restrictions were disabled."}, {"lang": "es", "value": "El script de actualizaci\u00f3n de MOTD en el paquete de archivos base en Ubuntu 18.04 LTS en versiones anteriores a la 10.1ubuntu2.2 y Ubuntu 18.10 anteriores a la 10.1ubuntu6 manejaba incorrectamente los archivos temporales. Un atacante local podr\u00eda usar este problema para provocar una denegaci\u00f3n de servicio o posiblemente escalar privilegios si se desactivan las restricciones de enlaces simb\u00f3licos del kernel."}], "id": "CVE-2018-6557", "lastModified": "2026-06-17T02:02:01.367", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "LOCAL", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 4.4, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:L/AC:M/Au:N/C:P/I:P/A:P", "version": "2.0"}, "exploitabilityScore": 3.4, "impactScore": 6.4, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.0, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2018-08-21T16:29:00.637", "references": [{"source": "security@ubuntu.com", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://www.securityfocus.com/bid/105148"}, {"source": "security@ubuntu.com", "tags": ["Broken Link", "Third Party Advisory", "VDB Entry"], "url": "http://www.securitytracker.com/id/1041530"}, {"source": "security@ubuntu.com", "tags": ["Vendor Advisory"], "url": "https://usn.ubuntu.com/3748-1/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://www.securityfocus.com/bid/105148"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Broken Link", "Third Party Advisory", "VDB Entry"], "url": "http://www.securitytracker.com/id/1041530"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://usn.ubuntu.com/3748-1/"}], "sourceIdentifier": "security@ubuntu.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-59"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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