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{"acknowledgement": "Red Hat would like to thank the Samba project for reporting this issue. Upstream acknowledges Christian Naumer as the original reporter.", "bugzilla": {"description": "samba: Use after free during DNS zone scavenging in Samba AD DC", "id": "1791204", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1791204"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["There is a use-after-free issue in all samba 4.9.x versions before 4.9.18, all samba 4.10.x versions before 4.10.12 and all samba 4.11.x versions before 4.11.5, essentially due to a call to realloc() while other local variables still point at the original buffer.", "A flaw was found in samba. An off-by-default feature to tombstone dynamically created DNS records once they have reached their expiry time contains a use-after-free flaw that allows read memory to be saved back into the database. The highest threat from this vulnerability is to system availability."], "mitigation": {"lang": "en:us", "value": "The code in question is not run in the default configuration, so the workaround is simply to not set\ndns zone scavenging = yes"}, "name": "CVE-2019-19344", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Not affected", "package_name": "samba", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "samba", "product_name": "Red Hat Enterprise Linux 6"}, {"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": "2020-01-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2019-19344\nhttps://nvd.nist.gov/vuln/detail/CVE-2019-19344\nhttps://www.samba.org/samba/security/CVE-2019-19344.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 4.11.5, samba 4.10.12, samba 4.9.18"}