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{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:*", "matchCriteriaId": "E538FCAE-3E2C-4EA8-A74F-ABF47652C15C", "versionEndIncluding": "4.2.7p444", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "The symmetric-key feature in the receive function in ntp_proto.c in ntpd in NTP 4.x before 4.2.8p2 requires a correct MAC only if the MAC field has a nonzero length, which makes it easier for man-in-the-middle attackers to spoof packets by omitting the MAC."}, {"lang": "es", "value": "La caracter\u00edstica symmetric-key en la funci\u00f3n receive en ntp_proto.c en ntpd en NTP 4.x anterior a 4.2.8p2 requiere un MAC correcto \u00fanicamente si el campo MAC tiene una longitud que no sea cero, lo que facilita a atacantes man-in-the-middle falsificar paquetes mediante la omisi\u00f3n del MAC."}], "id": "CVE-2015-1798", "lastModified": "2026-05-06T22:30:45.220", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "LOW", "cvssData": {"accessComplexity": "HIGH", "accessVector": "ADJACENT_NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 1.8, "confidentialityImpact": "NONE", "integrityImpact": "PARTIAL", "vectorString": "AV:A/AC:H/Au:N/C:N/I:P/A:N", "version": "2.0"}, "exploitabilityScore": 3.2, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}]}, "published": "2015-04-08T10:59:04.610", "references": [{"source": "secalert@redhat.com", "url": "http://bugs.ntp.org/show_bug.cgi?id=2779"}, {"source": "secalert@redhat.com", "url": "http://lists.apple.com/archives/security-announce/2015/Jun/msg00002.html"}, {"source": "secalert@redhat.com", "url": "http://lists.fedoraproject.org/pipermail/package-announce/2015-April/155863.html"}, {"source": "secalert@redhat.com", "url": 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{"acknowledgement": "This issue was discovered by Miroslav Lichv\u00e1r (Red Hat).", "affected_release": [{"advisory": "RHSA-2015:1459", "cpe": "cpe:/o:redhat:enterprise_linux:6", "package": "ntp-0:4.2.6p5-5.el6", "product_name": "Red Hat Enterprise Linux 6", "release_date": "2015-07-21T00:00:00Z"}, {"advisory": "RHSA-2015:2231", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "ntp-0:4.2.6p5-22.el7", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2015-11-19T00:00:00Z"}], "bugzilla": {"description": "ntp: ntpd accepts unauthenticated packets with symmetric key crypto", "id": "1199430", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1199430"}, "csaw": false, "cvss": {"cvss_base_score": "2.6", "cvss_scoring_vector": "AV:N/AC:H/Au:N/C:N/I:P/A:N", "status": "verified"}, "cwe": "CWE-347", "details": ["The symmetric-key feature in the receive function in ntp_proto.c in ntpd in NTP 4.x before 4.2.8p2 requires a correct MAC only if the MAC field has a nonzero length, which makes it easier for man-in-the-middle attackers to spoof packets by omitting the MAC.", "It was found that ntpd did not check whether a Message Authentication Code (MAC) was present in a received packet when ntpd was configured to use symmetric cryptographic keys. A man-in-the-middle attacker could use this flaw to send crafted packets that would be accepted by a client or a peer without the attacker knowing the symmetric key."], "name": "CVE-2015-1798", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Not affected", "package_name": "ntp", "product_name": "Red Hat Enterprise Linux 5"}], "public_date": "2015-04-07T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2015-1798\nhttps://nvd.nist.gov/vuln/detail/CVE-2015-1798"], "statement": "This issue did not affect the version of ntp as shipped with Red Hat Enterprise Linux 5", "threat_severity": "Low"}

{}