CVE-2018-18955

{"cve": {"data_type": "CVE", "references": {"reference_data": [{"url": "https://github.com/torvalds/linux/commit/d2f007dbe7e4c9583eea6eb04d60001e85c6f1bd", "name": "https://github.com/torvalds/linux/commit/d2f007dbe7e4c9583eea6eb04d60001e85c6f1bd", "tags": ["Patch", "Vendor Advisory"], "refsource": "MISC"}, {"url": "https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.2", "name": "https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.2", "tags": ["Patch", "Vendor Advisory"], "refsource": "MISC"}, {"url": "https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.19", "name": "https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.19", "tags": ["Patch", "Vendor Advisory"], "refsource": "MISC"}, {"url": "https://bugs.chromium.org/p/project-zero/issues/detail?id=1712", "name": "https://bugs.chromium.org/p/project-zero/issues/detail?id=1712", "tags": ["Patch", "Third Party Advisory"], "refsource": "MISC"}, {"url": "http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d2f007dbe7e4c9583eea6eb04d60001e85c6f1bd", "name": "http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d2f007dbe7e4c9583eea6eb04d60001e85c6f1bd", "tags": ["Patch", "Vendor Advisory"], "refsource": "MISC"}, {"url": "http://www.securityfocus.com/bid/105941", "name": "105941", "tags": ["Third Party Advisory", "VDB Entry"], "refsource": "BID"}, {"url": "https://www.exploit-db.com/exploits/45886/", "name": "45886", "tags": ["Exploit", "Patch", "Third Party Advisory", "VDB Entry"], "refsource": "EXPLOIT-DB"}, {"url": "https://usn.ubuntu.com/3833-1/", "name": "USN-3833-1", "tags": ["Third Party Advisory"], "refsource": "UBUNTU"}, {"url": "https://usn.ubuntu.com/3832-1/", "name": "USN-3832-1", "tags": ["Third Party Advisory"], "refsource": "UBUNTU"}, {"url": "https://www.exploit-db.com/exploits/45915/", "name": "45915", "tags": ["Exploit", "Third Party Advisory", "VDB Entry"], "refsource": "EXPLOIT-DB"}, {"url": "https://usn.ubuntu.com/3836-2/", "name": "USN-3836-2", "tags": ["Third Party Advisory"], "refsource": "UBUNTU"}, {"url": "https://usn.ubuntu.com/3836-1/", "name": "USN-3836-1", "tags": ["Third Party Advisory"], "refsource": "UBUNTU"}, {"url": "https://usn.ubuntu.com/3835-1/", "name": "USN-3835-1", "tags": ["Third Party Advisory"], "refsource": "UBUNTU"}, {"url": "https://support.f5.com/csp/article/K39103040", "name": "https://support.f5.com/csp/article/K39103040", "tags": [], "refsource": "CONFIRM"}, {"url": "https://security.netapp.com/advisory/ntap-20190416-0003/", "name": "https://security.netapp.com/advisory/ntap-20190416-0003/", "tags": [], "refsource": "CONFIRM"}]}, "data_format": "MITRE", "description": {"description_data": [{"lang": "en", "value": "In the Linux kernel 4.15.x through 4.19.x before 4.19.2, map_write() in kernel/user_namespace.c allows privilege escalation because it mishandles nested user namespaces with more than 5 UID or GID ranges. A user who has CAP_SYS_ADMIN in an affected user namespace can bypass access controls on resources outside the namespace, as demonstrated by reading /etc/shadow. This occurs because an ID transformation takes place properly for the namespaced-to-kernel direction but not for the kernel-to-namespaced direction."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "en", "value": "CWE-863"}]}]}, "data_version": "4.0", "CVE_data_meta": {"ID": "CVE-2018-18955", "ASSIGNER": "cve@mitre.org"}}, "impact": {"baseMetricV2": {"cvssV2": {"version": "2.0", "baseScore": 4.4, "accessVector": "LOCAL", "vectorString": "AV:L/AC:M/Au:N/C:P/I:P/A:P", "authentication": "NONE", "integrityImpact": "PARTIAL", "accessComplexity": "MEDIUM", "availabilityImpact": "PARTIAL", "confidentialityImpact": "PARTIAL"}, "severity": "MEDIUM", "acInsufInfo": false, "impactScore": 6.4, "obtainAllPrivilege": false, "exploitabilityScore": 3.4, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}, "baseMetricV3": {"cvssV3": {"scope": "UNCHANGED", "version": "3.0", "baseScore": 7.0, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.0}}, "publishedDate": "2018-11-16T20:29Z", "configurations": {"nodes": [{"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndExcluding": "4.19.2", "versionStartIncluding": "4.15"}]}, {"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*", "cpe_name": [], "vulnerable": true}]}], "CVE_data_version": "4.0"}, "lastModifiedDate": "2020-08-24T17:37Z"}