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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"}