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    CVE-2016-1550

    An exploitable vulnerability exists in the message authentication functionality of libntp in ntp 4.2.8p4 and NTPSec a5fb34b9cc89b92a8fef2f459004865c93bb7f92. An attacker can send a series of crafted messages to attempt to recover the message digest key.

    Published:Apr 26, 2016
    Last Modified:Apr 20, 2025
    EPS:Jan 6, 2017
    EPSS Score:0.01665
    CVSS Score:5.3

    Affected Products

    Vendor
    Ntp
    Product
    Ntp
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Rhel Eus

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-116 Excavation
    CAPEC-13 Subverting Environment Variable Values
    CAPEC-169 Footprinting
    CAPEC-22 Exploiting Trust in Client
    CAPEC-224 Fingerprinting
    CAPEC-285 ICMP Echo Request Ping
    CAPEC-287 TCP SYN Scan
    CAPEC-290 Enumerate Mail Exchange (MX) Records
    CAPEC-291 DNS Zone Transfers
    CAPEC-292 Host Discovery
    CAPEC-293 Traceroute Route Enumeration
    CAPEC-294 ICMP Address Mask Request
    CAPEC-295 Timestamp Request
    CAPEC-296 ICMP Information Request
    CAPEC-297 TCP ACK Ping
    CAPEC-298 UDP Ping
    CAPEC-299 TCP SYN Ping
    CAPEC-300 Port Scanning
    CAPEC-301 TCP Connect Scan
    CAPEC-302 TCP FIN Scan
    CAPEC-303 TCP Xmas Scan
    CAPEC-304 TCP Null Scan
    CAPEC-305 TCP ACK Scan
    CAPEC-306 TCP Window Scan
    CAPEC-307 TCP RPC Scan
    CAPEC-308 UDP Scan
    CAPEC-309 Network Topology Mapping
    CAPEC-310 Scanning for Vulnerable Software
    CAPEC-312 Active OS Fingerprinting
    CAPEC-313 Passive OS Fingerprinting
    CAPEC-317 IP ID Sequencing Probe
    CAPEC-318 IP 'ID' Echoed Byte-Order Probe
    CAPEC-319 IP (DF) 'Don't Fragment Bit' Echoing Probe
    CAPEC-320 TCP Timestamp Probe
    CAPEC-321 TCP Sequence Number Probe
    CAPEC-322 TCP (ISN) Greatest Common Divisor Probe
    CAPEC-323 TCP (ISN) Counter Rate Probe
    CAPEC-324 TCP (ISN) Sequence Predictability Probe
    CAPEC-325 TCP Congestion Control Flag (ECN) Probe
    CAPEC-326 TCP Initial Window Size Probe
    CAPEC-327 TCP Options Probe
    CAPEC-328 TCP 'RST' Flag Checksum Probe
    CAPEC-329 ICMP Error Message Quoting Probe
    CAPEC-330 ICMP Error Message Echoing Integrity Probe
    CAPEC-472 Browser Fingerprinting
    CAPEC-497 File Discovery
    CAPEC-508 Shoulder Surfing
    CAPEC-573 Process Footprinting
    CAPEC-574 Services Footprinting
    CAPEC-575 Account Footprinting
    CAPEC-576 Group Permission Footprinting
    CAPEC-577 Owner Footprinting
    CAPEC-59 Session Credential Falsification through Prediction
    CAPEC-60 Reusing Session IDs (aka Session Replay)
    CAPEC-616 Establish Rogue Location
    CAPEC-643 Identify Shared Files/Directories on System
    CAPEC-646 Peripheral Footprinting
    CAPEC-651 Eavesdropping
    CAPEC-79 Using Slashes in Alternate Encoding

    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://lists.fedoraproject.org/pipermail/package-announce/2016-May/183647.html
    http://lists.fedoraproject.org/pipermail/package-announce/2016-May/184669.html
    http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00034.html
    http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00037.html
    http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00052.html
    http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00001.html
    http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00020.html
    http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00026.html
    http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00042.html
    http://lists.opensuse.org/opensuse-updates/2016-05/msg00114.html
    http://packetstormsecurity.com/files/136864/Slackware-Security-Advisory-ntp-Updates.html
    http://rhn.redhat.com/errata/RHSA-2016-1552.html
    http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160428-ntpd
    http://www.debian.org/security/2016/dsa-3629
    http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
    http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
    http://www.securityfocus.com/archive/1/538233/100/0/threaded
    http://www.securityfocus.com/archive/1/archive/1/538233/100/0/threaded
    http://www.securityfocus.com/bid/88261
    http://www.securitytracker.com/id/1035705
    http://www.talosintelligence.com/reports/TALOS-2016-0084/
    http://www.ubuntu.com/usn/USN-3096-1
    https://access.redhat.com/errata/RHSA-2016:1141
    https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf
    https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf
    https://security.FreeBSD.org/advisories/FreeBSD-SA-16:16.ntp.asc
    https://security.gentoo.org/glsa/201607-15
    https://security.netapp.com/advisory/ntap-20171004-0002/
    https://us-cert.cisa.gov/ics/advisories/icsa-21-103-11
    https://us-cert.cisa.gov/ics/advisories/icsa-21-159-11
    https://www.arista.com/en/support/advisories-notices/security-advisories/1332-security-advisory-19
    https://www.debian.org/security/2016/dsa-3629
    https://www.kb.cert.org/vuls/id/718152
    https://www.talosintelligence.com/vulnerability_reports/TALOS-2016-0084
    http://lists.fedoraproject.org/pipermail/package-announce/2016-May/183647.html
    http://lists.fedoraproject.org/pipermail/package-announce/2016-May/184669.html
    http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00034.html
    http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00037.html
    http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00052.html
    http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00001.html
    http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00020.html
    http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00026.html
    http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00042.html
    http://lists.opensuse.org/opensuse-updates/2016-05/msg00114.html
    http://packetstormsecurity.com/files/136864/Slackware-Security-Advisory-ntp-Updates.html
    http://rhn.redhat.com/errata/RHSA-2016-1552.html
    http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160428-ntpd
    http://www.debian.org/security/2016/dsa-3629
    http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
    http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
    http://www.securityfocus.com/archive/1/538233/100/0/threaded
    http://www.securityfocus.com/archive/1/archive/1/538233/100/0/threaded
    http://www.securityfocus.com/bid/88261
    http://www.securitytracker.com/id/1035705
    http://www.talosintelligence.com/reports/TALOS-2016-0084/
    http://www.ubuntu.com/usn/USN-3096-1
    https://access.redhat.com/errata/RHSA-2016:1141
    https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf
    https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf
    https://security.FreeBSD.org/advisories/FreeBSD-SA-16:16.ntp.asc
    https://security.gentoo.org/glsa/201607-15
    https://security.netapp.com/advisory/ntap-20171004-0002/
    https://us-cert.cisa.gov/ics/advisories/icsa-21-103-11
    https://us-cert.cisa.gov/ics/advisories/icsa-21-159-11
    https://www.arista.com/en/support/advisories-notices/security-advisories/1332-security-advisory-19
    https://www.debian.org/security/2016/dsa-3629
    https://www.kb.cert.org/vuls/id/718152
    https://www.talosintelligence.com/vulnerability_reports/TALOS-2016-0084

    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