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{"acknowledgement": "Red Hat would like to thank The Samba Team for reporting this issue. Upstream acknowledges Alex MacCuish as the original reporter.", "bugzilla": {"description": "samba: Double-free in Samba AD DC KDC with PKINIT", "id": "1642545", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1642545"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.7", "cvss3_scoring_vector": "CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["Samba from version 4.3.0 and before versions 4.7.12, 4.8.7 and 4.9.3 are vulnerable to a denial of service. When configured to accept smart-card authentication, Samba's KDC will call talloc_free() twice on the same memory if the principal in a validly signed certificate does not match the principal in the AS-REQ. This is only possible after authentication with a trusted certificate. talloc is robust against further corruption from a double-free with talloc_free() and directly calls abort(), terminating the KDC process.", "A double-free was found when Samba's KDC is used as an Active Directory Domain Controller. An authenticated attacker could use this flaw to cause a denial of service (application crash)."], "name": "CVE-2018-16841", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "samba4", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "samba", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "samba", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/a:redhat:storage:3", "fix_state": "Not affected", "package_name": "samba", "product_name": "Red Hat Storage 3"}, {"cpe": "cpe:/o:redhat:rhev_hypervisor:4", "fix_state": "Not affected", "package_name": "samba", "product_name": "Red Hat Virtualization 4"}], "public_date": "2018-11-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2018-16841\nhttps://nvd.nist.gov/vuln/detail/CVE-2018-16841\nhttps://www.samba.org/samba/security/CVE-2018-16841.html"], "statement": "This flaw does not affect the version of samba shipped with Red Hat Enterprise Linux because there is no support for samba as Active Directory Domain Controller.", "threat_severity": "Moderate", "upstream_fix": "samba 4.7.12, samba 4.8.7, samba 4.9.3"}