CVE-2018-6954

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This occurs even if the fs.protected_symlinks sysctl is turned on."}, {"lang": "es", "value": "systemd-tmpfiles en systemd, hasta 237, gestiona de manera incorrecta los v\u00ednculos simb\u00f3licos presentes en componentes de ruta no terminales. Esto permite que usuarios locales se hagan due\u00f1os de archivos arbitrarios mediante vectores relacionados con la creaci\u00f3n de un directorio y un archivo bajo ese directorio para, posteriormente, reemplazarlo por un v\u00ednculo simb\u00f3lico. Esto ocurre incluso aunque el sysctl fs.protected_symlinks est\u00e9 activado."}], "id": "CVE-2018-6954", "lastModified": "2026-06-17T02:02:30.433", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "HIGH", "cvssData": {"accessComplexity": "LOW", "accessVector": "LOCAL", "authentication": "NONE", "availabilityImpact": "COMPLETE", "baseScore": 7.2, "confidentialityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C", "version": "2.0"}, "exploitabilityScore": 3.9, "impactScore": 10.0, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2018-6954", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2025-06-09T15:53:55.273054Z", "version": "2.0.3"}}]}, "published": "2018-02-13T20:29:00.547", "references": [{"source": "cve@mitre.org", "tags": ["Third Party Advisory"], "url": "http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00062.html"}, {"source": "cve@mitre.org", "tags": ["Exploit", "Issue Tracking", "Patch", "Third Party Advisory"], "url": "https://github.com/systemd/systemd/issues/7986"}, {"source": "cve@mitre.org", "url": "https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E"}, {"source": "cve@mitre.org", "url": "https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E"}, {"source": "cve@mitre.org", "tags": ["Third Party Advisory"], "url": "https://usn.ubuntu.com/3816-1/"}, {"source": "cve@mitre.org", "tags": ["Third Party Advisory"], "url": "https://usn.ubuntu.com/3816-2/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00062.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Issue Tracking", "Patch", "Third Party Advisory"], "url": "https://github.com/systemd/systemd/issues/7986"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://usn.ubuntu.com/3816-1/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://usn.ubuntu.com/3816-2/"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-59"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-59"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "systemd: Mishandled symlinks in systemd-tmpfiles allows local users to obtain ownership of arbitrary files", "id": "1545017", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1545017"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-59", "details": ["systemd-tmpfiles in systemd through 237 mishandles symlinks present in non-terminal path components, which allows local users to obtain ownership of arbitrary files via vectors involving creation of a directory and a file under that directory, and later replacing that directory with a symlink. This occurs even if the fs.protected_symlinks sysctl is turned on.", "It has been discovered that systemd-tmpfiles mishandles symbolic links present in non-terminal path components. In some configurations a local user could use this vulnerability to get access to arbitrary files when the systemd-tmpfiles command is run."], "mitigation": {"lang": "en:us", "value": "There is no known mitigation available."}, "name": "CVE-2018-6954", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Will not fix", "package_name": "systemd", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "systemd", "product_name": "Red Hat Enterprise Linux 8"}], "public_date": "2018-01-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2018-6954\nhttps://nvd.nist.gov/vuln/detail/CVE-2018-6954"], "statement": "This flaw affects in particular those systems where custom tmpfiles files are configured (e.g. in /etc/tmpfiles.d). Indeed systemd-tmpfiles installed by system packages set privileges of a directory either to root or to a service specific user and not to interactive users. Even in case they provide one of the vulnerable tmpfiles configuration file (e.g. recursive \"Z\" type entries), an attacker would still need to perform the attack as the service specific user, which means they would first need to compromise that service.\nMoreover, systemd-tmpfiles service is automatically executed only when the system boots, when it is very unlikely an attacker has already a chance to perform any action at all. Otherwise, an attacker would have to wait for an administrator to manually run the `systemd-tmpfiles --create` command.", "threat_severity": "Moderate"}

{}