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{"bugzilla": {"description": "ntp: Using port 123 for modes where a fixed port number is not required facilitates off-path attacks.", "id": "1703341", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1703341"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.1", "cvss3_scoring_vector": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-384", "details": ["Network Time Protocol (NTP), as specified in RFC 5905, uses port 123 even for modes where a fixed port number is not required, which makes it easier for remote attackers to conduct off-path attacks."], "mitigation": {"lang": "en:us", "value": "On Red Hat Enterprise Linux 6 and later, switching from ntp to chrony is recommended. Among other design improvements, chrony uses a randomised source port by default.\nIf using ntp, the source port can be randomised by iptables masquerading rules, effectively mitigating this vulnerability:\niptables -t nat -I POSTROUTING -p udp -m udp --sport 123 -j MASQUERADE --to-ports 60000-61000"}, "name": "CVE-2019-11331", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Will not fix", "package_name": "ntp", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Will not fix", "package_name": "ntp", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Will not fix", "package_name": "ntp", "product_name": "Red Hat Enterprise Linux 7"}], "public_date": "2019-04-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2019-11331\nhttps://nvd.nist.gov/vuln/detail/CVE-2019-11331"], "threat_severity": "Low"}