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  <DocumentTitle xml:lang="en">Security update for ntp</DocumentTitle>
  <DocumentType>SUSE Patch</DocumentType>
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    <ContactDetails>security@suse.de</ContactDetails>
    <IssuingAuthority>SUSE Security Team</IssuingAuthority>
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    <Status>Final</Status>
    <Version>1</Version>
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        <Number>1</Number>
        <Date>2018-04-17T06:40:15Z</Date>
        <Description>current</Description>
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    <InitialReleaseDate>2018-04-17T06:40:15Z</InitialReleaseDate>
    <CurrentReleaseDate>2018-04-17T06:40:15Z</CurrentReleaseDate>
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      <Date>2017-02-24T01:00:00Z</Date>
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  <DocumentNotes>
    <Note Title="Topic" Type="Summary" Ordinal="1" xml:lang="en">Security update for ntp</Note>
    <Note Title="Details" Type="General" Ordinal="2" xml:lang="en">This update for ntp fixes the following issues:

- Update to 4.2.8p11 (bsc#1082210):
  * CVE-2016-1549: Sybil vulnerability: ephemeral association
    attack. While fixed in ntp-4.2.8p7, there are significant
    additional protections for this issue in 4.2.8p11.
  * CVE-2018-7182: ctl_getitem(): buffer read overrun
    leads to undefined behavior and information leak. (bsc#1083426)
  * CVE-2018-7170: Multiple authenticated ephemeral
    associations. (bsc#1083424)
  * CVE-2018-7184: Interleaved symmetric mode cannot
    recover from bad state. (bsc#1083422)
  * CVE-2018-7185: Unauthenticated packet can reset
    authenticated interleaved association. (bsc#1083420)
  * CVE-2018-7183: ntpq:decodearr() can write beyond its
    buffer limit.(bsc#1083417)
- Don't use libevent's cached time stamps in sntp. (bsc#1077445)

This update was imported from the SUSE:SLE-12-SP1:Update update project.</Note>
    <Note Title="Terms of Use" Type="Legal Disclaimer" Ordinal="3" xml:lang="en">The CVRF data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).</Note>
  </DocumentNotes>
  <DocumentDistribution xml:lang="en">Copyright SUSE LLC under the Creative Commons License 4.0 with Attribution (CC-BY-4.0)</DocumentDistribution>
  <DocumentReferences>
    <Reference Type="Self">
      <URL>https://lists.opensuse.org/opensuse-updates/2018-04/msg00045.html</URL>
      <Description>E-Mail link for openSUSE-SU-2018:0970-1</Description>
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    <Notes>
      <Note Title="Vulnerability Description" Type="General" Ordinal="1" xml:lang="en">A malicious authenticated peer can create arbitrarily-many ephemeral associations in order to win the clock selection algorithm in ntpd in NTP 4.2.8p4 and earlier and NTPsec 3e160db8dc248a0bcb053b56a80167dc742d2b74 and a5fb34b9cc89b92a8fef2f459004865c93bb7f92 and modify a victim's clock.</Note>
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        <URL>https://www.suse.com/security/cve/CVE-2016-1549.html</URL>
        <Description>CVE-2016-1549</Description>
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      <Reference>
        <URL>https://bugzilla.suse.com/1083424</URL>
        <Description>SUSE Bug 1083424</Description>
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      <Reference>
        <URL>https://bugzilla.suse.com/977446</URL>
        <Description>SUSE Bug 977446</Description>
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        <URL>https://bugzilla.suse.com/977451</URL>
        <Description>SUSE Bug 977451</Description>
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    <Notes>
      <Note Title="Vulnerability Description" Type="General" Ordinal="1" xml:lang="en">ntpd in ntp 4.2.x before 4.2.8p7 and 4.3.x before 4.3.92 allows authenticated users that know the private symmetric key to create arbitrarily-many ephemeral associations in order to win the clock selection of ntpd and modify a victim's clock via a Sybil attack. This issue exists because of an incomplete fix for CVE-2016-1549.</Note>
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        <URL>https://www.suse.com/security/cve/CVE-2018-7170.html</URL>
        <Description>CVE-2018-7170</Description>
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        <URL>https://bugzilla.suse.com/1082210</URL>
        <Description>SUSE Bug 1082210</Description>
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        <URL>https://bugzilla.suse.com/1083424</URL>
        <Description>SUSE Bug 1083424</Description>
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      <Reference>
        <URL>https://bugzilla.suse.com/1098531</URL>
        <Description>SUSE Bug 1098531</Description>
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        <URL>https://bugzilla.suse.com/1155513</URL>
        <Description>SUSE Bug 1155513</Description>
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    <Notes>
      <Note Title="Vulnerability Description" Type="General" Ordinal="1" xml:lang="en">The ctl_getitem method in ntpd in ntp-4.2.8p6 before 4.2.8p11 allows remote attackers to cause a denial of service (out-of-bounds read) via a crafted mode 6 packet with a ntpd instance from 4.2.8p6 through 4.2.8p10.</Note>
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        <URL>https://bugzilla.suse.com/1082210</URL>
        <Description>SUSE Bug 1082210</Description>
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        <Description>SUSE Bug 1083426</Description>
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      <Note Title="Vulnerability Description" Type="General" Ordinal="1" xml:lang="en">Buffer overflow in the decodearr function in ntpq in ntp 4.2.8p6 through 4.2.8p10 allows remote attackers to execute arbitrary code by leveraging an ntpq query and sending a response with a crafted array.</Note>
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        <URL>https://bugzilla.suse.com/1082210</URL>
        <Description>SUSE Bug 1082210</Description>
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        <Description>SUSE Bug 1083417</Description>
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    <Notes>
      <Note Title="Vulnerability Description" Type="General" Ordinal="1" xml:lang="en">ntpd in ntp 4.2.8p4 before 4.2.8p11 drops bad packets before updating the "received" timestamp, which allows remote attackers to cause a denial of service (disruption) by sending a packet with a zero-origin timestamp causing the association to reset and setting the contents of the packet as the most recent timestamp. This issue is a result of an incomplete fix for CVE-2015-7704.</Note>
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      <Note Title="Vulnerability Description" Type="General" Ordinal="1" xml:lang="en">The protocol engine in ntp 4.2.6 before 4.2.8p11 allows a remote attackers to cause a denial of service (disruption) by continually sending a packet with a zero-origin timestamp and source IP address of the "other side" of an interleaved association causing the victim ntpd to reset its association.</Note>
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        <Description>SUSE Bug 1083420</Description>
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