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    CVE-2016-4955

    ntpd in NTP 4.x before 4.2.8p8, when autokey is enabled, allows remote attackers to cause a denial of service (peer-variable clearing and association outage) by sending (1) a spoofed crypto-NAK packet or (2) a packet with an incorrect MAC value at a certain time.

    Published:Jun 2, 2016
    Last Modified:Apr 12, 2025
    EPS:Jul 5, 2016
    EPSS Score:0.05194
    CVSS Score:5.9

    Affected Products

    Vendor
    Novell
    Product
    Suse Manager
    Vendor
    Ntp
    Product
    Ntp
    Vendor
    Opensuse
    Product
    Leap
    Vendor
    Opensuse
    Product
    Opensuse
    Vendor
    Oracle
    Product
    Solaris
    Vendor
    Siemens
    Product
    Simatic Net Cp 443-1 Opc Ua
    Vendor
    Siemens
    Product
    Simatic Net Cp 443-1 Opc Ua Firmware
    Vendor
    Suse
    Product
    Linux Enterprise Desktop
    Vendor
    Suse
    Product
    Linux Enterprise Server
    Vendor
    Suse
    Product
    Manager Proxy
    Vendor
    Suse
    Product
    Openstack Cloud

    Exploits

    No exploit reference

    References

    http://bugs.ntp.org/3043
    http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00018.html
    http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00020.html
    http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00023.html
    http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00024.html
    http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00028.html
    http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00040.html
    http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00026.html
    http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00042.html
    http://packetstormsecurity.com/files/137321/Slackware-Security-Advisory-ntp-Updates.html
    http://packetstormsecurity.com/files/137322/FreeBSD-Security-Advisory-FreeBSD-SA-16-24.ntp.html
    http://support.ntp.org/bin/view/Main/NtpBug3043
    http://support.ntp.org/bin/view/Main/SecurityNotice
    http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160603-ntpd
    http://www.kb.cert.org/vuls/id/321640
    http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
    http://www.securityfocus.com/archive/1/538599/100/0/threaded
    http://www.securityfocus.com/archive/1/538600/100/0/threaded
    http://www.securityfocus.com/archive/1/archive/1/538599/100/0/threaded
    http://www.securityfocus.com/archive/1/archive/1/538600/100/0/threaded
    http://www.securityfocus.com/bid/91007
    http://www.securitytracker.com/id/1036037
    http://www.ubuntu.com/usn/USN-3096-1
    https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/K3EYJQHJZ2KTVQ7ICEFHXTLZ36MRASWX/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ORAMN3Q7TVJ54MBYF75XCJOE3DP7LYHT/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WNWGCQLW2VY72NIUYMJOCAKJKTXHDUK2/
    https://security.FreeBSD.org/advisories/FreeBSD-SA-16:24.ntp.asc
    https://security.gentoo.org/glsa/201607-15
    https://us-cert.cisa.gov/ics/advisories/icsa-21-159-11
    https://www.kb.cert.org/vuls/id/321640
    http://bugs.ntp.org/3043
    http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00018.html
    http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00020.html
    http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00023.html
    http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00024.html
    http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00028.html
    http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00040.html
    http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00026.html
    http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00042.html
    http://packetstormsecurity.com/files/137321/Slackware-Security-Advisory-ntp-Updates.html
    http://packetstormsecurity.com/files/137322/FreeBSD-Security-Advisory-FreeBSD-SA-16-24.ntp.html
    http://support.ntp.org/bin/view/Main/NtpBug3043
    http://support.ntp.org/bin/view/Main/SecurityNotice
    http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160603-ntpd
    http://www.kb.cert.org/vuls/id/321640
    http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
    http://www.securityfocus.com/archive/1/538599/100/0/threaded
    http://www.securityfocus.com/archive/1/538600/100/0/threaded
    http://www.securityfocus.com/archive/1/archive/1/538599/100/0/threaded
    http://www.securityfocus.com/archive/1/archive/1/538600/100/0/threaded
    http://www.securityfocus.com/bid/91007
    http://www.securitytracker.com/id/1036037
    http://www.ubuntu.com/usn/USN-3096-1
    https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/K3EYJQHJZ2KTVQ7ICEFHXTLZ36MRASWX/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ORAMN3Q7TVJ54MBYF75XCJOE3DP7LYHT/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WNWGCQLW2VY72NIUYMJOCAKJKTXHDUK2/
    https://security.FreeBSD.org/advisories/FreeBSD-SA-16:24.ntp.asc
    https://security.gentoo.org/glsa/201607-15
    https://us-cert.cisa.gov/ics/advisories/icsa-21-159-11
    https://www.kb.cert.org/vuls/id/321640

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High