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    CVE-2016-4954

    The process_packet function in ntp_proto.c in ntpd in NTP 4.x before 4.2.8p8 allows remote attackers to cause a denial of service (peer-variable modification) by sending spoofed packets from many source IP addresses in a certain scenario, as demonstrated by triggering an incorrect leap indication.

    Published:Jun 2, 2016
    Last Modified:Apr 12, 2025
    EPS:Jul 5, 2016
    EPSS Score:0.06941
    CVSS Score:7.5

    Affected Products

    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
    Siemens
    Product
    Tim 4r-ie
    Vendor
    Siemens
    Product
    Tim 4r-ie Dnp3
    Vendor
    Siemens
    Product
    Tim 4r-ie Dnp3 Firmware
    Vendor
    Siemens
    Product
    Tim 4r-ie Firmware
    Vendor
    Suse
    Product
    Linux Enterprise Desktop
    Vendor
    Suse
    Product
    Linux Enterprise Server
    Vendor
    Suse
    Product
    Manager
    Vendor
    Suse
    Product
    Manager Proxy
    Vendor
    Suse
    Product
    Openstack Cloud

    Exploits

    No exploit reference

    Related CVEs

    CVE-2023-26554 (CVSS 5.6) — mstolfp in libntp/mstolfp.c in NTP 4.2.8p15 has an out-of-bounds write when adding a '\0' character. An advers…
    CVE-2023-26555 (CVSS 6.4) — praecis_parse in ntpd/refclock_palisade.c in NTP 4.2.8p15 has an out-of-bounds write. Any attack method would …
    CVE-2023-26552 (CVSS 5.6) — mstolfp in libntp/mstolfp.c in NTP 4.2.8p15 has an out-of-bounds write when adding a decimal point. An adversa…
    CVE-2023-26553 (CVSS 5.6) — mstolfp in libntp/mstolfp.c in NTP 4.2.8p15 has an out-of-bounds write when copying the trailing number. An ad…
    CVE-2023-26551 (CVSS 5.6) — mstolfp in libntp/mstolfp.c in NTP 4.2.8p15 has an out-of-bounds write in the cp<cpdec while loop. An adversar…
    CVE-2020-15025 (CVSS 4.4) — ntpd in ntp 4.2.8 before 4.2.8p15 and 4.3.x before 4.3.101 allows remote attackers to cause a denial of servic…
    CVE-2018-8956 (CVSS 5.3) — ntpd in ntp 4.2.8p10, 4.2.8p11, 4.2.8p12 and 4.2.8p13 allow remote attackers to prevent a broadcast client fro…
    CVE-2020-11868 (CVSS 7.5) — ntpd in ntp before 4.2.8p14 and 4.3.x before 4.3.100 allows an off-path attacker to block unauthenticated sync…
    CVE-2020-13817 (CVSS 7.4) — ntpd in ntp before 4.2.8p14 and 4.3.x before 4.3.100 allows remote attackers to cause a denial of service (dae…
    CVE-2019-11331 (CVSS 8.1) — Network Time Protocol (NTP), as specified in RFC 5905, uses port 123 even for modes where a fixed port number …

    References

    http://bugs.ntp.org/3044
    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/NtpBug3044
    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/1/540683/100/0/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/archive/1/archive/1/540683/100/0/threaded
    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://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf
    https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03757en_us
    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-21-103-11
    https://us-cert.cisa.gov/ics/advisories/icsa-21-159-11
    https://www.kb.cert.org/vuls/id/321640
    http://bugs.ntp.org/3044
    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/NtpBug3044
    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/1/540683/100/0/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/archive/1/archive/1/540683/100/0/threaded
    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://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf
    https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03757en_us
    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-21-103-11
    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