CVE-2016-7433

NTP before 4.2.8p9 does not properly perform the initial sync calculations, which allows remote attackers to unspecified impact via unknown vectors, related to a root distance that did not include the peer dispersion.

Weakness

The product performs a calculation that generates incorrect or unintended results that are later used in security-critical decisions or resource management.

Affected Software

Potential Mitigations

• Use languages, libraries, or frameworks that make it easier to handle numbers without unexpected consequences.
• Examples include safe integer handling packages such as SafeInt (C++) or IntegerLib (C or C++).
• Use languages, libraries, or frameworks that make it easier to handle numbers without unexpected consequences.
• Examples include safe integer handling packages such as SafeInt (C++) or IntegerLib (C or C++).

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/128.html
• https://cwe.mitre.org/data/definitions/129.html

References

• http://lists.opensuse.org/opensuse-updates/2016-12/msg00153.html
• http://nwtime.org/ntp428p9_release/
• http://rhn.redhat.com/errata/RHSA-2017-0252.html
• http://support.ntp.org/bin/view/Main/NtpBug3067
• http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_Vulnerabilities
• http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20171129-01-ntpd-en
• http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
• http://www.securityfocus.com/archive/1/539955/100/0/threaded
• http://www.securityfocus.com/archive/1/540254/100/0/threaded
• http://www.securityfocus.com/archive/1/archive/1/539955/100/0/threaded
• http://www.securityfocus.com/archive/1/archive/1/540254/100/0/threaded
• http://www.securityfocus.com/bid/94455
• http://www.securitytracker.com/id/1037354
• http://www.ubuntu.com/usn/USN-3349-1
• https://bto.bluecoat.com/security-advisory/sa139
• https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf
• https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US\u0026docId=emr_na-hpesbux03706en_us
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ILMSYVQMMF37MANYEO7KBHOPSC74EKGN/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PABKEYX6ABBFJZGMXKH57X756EJUDS3C/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U5E3XBBCK5IXOLDAH2E4M3QKIYIHUMMP/
• https://security.FreeBSD.org/advisories/FreeBSD-SA-16:39.ntp.asc
• https://us-cert.cisa.gov/ics/advisories/icsa-21-159-11
• https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2017-227
• https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2017-227/
• https://www.kb.cert.org/vuls/id/633847
• http://lists.opensuse.org/opensuse-updates/2016-12/msg00153.html
• http://nwtime.org/ntp428p9_release/
• http://rhn.redhat.com/errata/RHSA-2017-0252.html
• http://support.ntp.org/bin/view/Main/NtpBug3067
• http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_Vulnerabilities
• http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20171129-01-ntpd-en
• http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
• http://www.securityfocus.com/archive/1/539955/100/0/threaded
• http://www.securityfocus.com/archive/1/540254/100/0/threaded
• http://www.securityfocus.com/archive/1/archive/1/539955/100/0/threaded
• http://www.securityfocus.com/archive/1/archive/1/540254/100/0/threaded
• http://www.securityfocus.com/bid/94455
• http://www.securitytracker.com/id/1037354
• http://www.ubuntu.com/usn/USN-3349-1
• https://bto.bluecoat.com/security-advisory/sa139
• https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf
• https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US\u0026docId=emr_na-hpesbux03706en_us
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ILMSYVQMMF37MANYEO7KBHOPSC74EKGN/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PABKEYX6ABBFJZGMXKH57X756EJUDS3C/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U5E3XBBCK5IXOLDAH2E4M3QKIYIHUMMP/
• https://security.FreeBSD.org/advisories/FreeBSD-SA-16:39.ntp.asc
• https://us-cert.cisa.gov/ics/advisories/icsa-21-159-11
• https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2017-227
• https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2017-227/
• https://www.kb.cert.org/vuls/id/633847