{
  "threat_severity" : "Low",
  "public_date" : "2015-04-07T00:00:00Z",
  "bugzilla" : {
    "description" : "ntp: ntpd accepts unauthenticated packets with symmetric key crypto",
    "id" : "1199430",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=1199430"
  },
  "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." ],
  "statement" : "This issue did not affect the version of ntp as shipped with Red Hat Enterprise Linux 5",
  "acknowledgement" : "This issue was discovered by Miroslav Lichvár (Red Hat).",
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 6",
    "release_date" : "2015-07-21T00:00:00Z",
    "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 7",
    "release_date" : "2015-11-19T00:00:00Z",
    "advisory" : "RHSA-2015:2231",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7",
    "package" : "ntp-0:4.2.6p5-22.el7"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 5",
    "fix_state" : "Not affected",
    "package_name" : "ntp",
    "cpe" : "cpe:/o:redhat:enterprise_linux:5"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2015-1798\nhttps://nvd.nist.gov/vuln/detail/CVE-2015-1798" ],
  "name" : "CVE-2015-1798",
  "csaw" : false
}