CVE-2015-7853

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    CVE-2015-7853

    Published: 7 Aug 2017Last Modified: 16 Apr 2026

    Summary:

    Details: The datalen parameter in the refclock driver in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to execute arbitrary code or cause a denial of service (crash) via a negative input value.

    References: http://support.ntp.org/bin/view/Main/NtpBug2920, http://www.securityfocus.com/bid/77273, http://www.securitytracker.com/id/1033951, http://www.ubuntu.com/usn/USN-2783-1, https://bto.bluecoat.com/security-advisory/sa103, https://bugzilla.redhat.com/show_bug.cgi?id=1274262, https://security.gentoo.org/glsa/201607-15, https://security.netapp.com/advisory/ntap-20171004-0001/, https://us-cert.cisa.gov/ics/advisories/icsa-21-159-11, http://support.ntp.org/bin/view/Main/NtpBug2920, https://bugzilla.redhat.com/show_bug.cgi?id=1274262, http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00020.html, http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00048.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/2015-11/msg00093.html, http://lists.opensuse.org/opensuse-updates/2016-05/msg00114.html, http://packetstormsecurity.com/files/134082/FreeBSD-Security-Advisory-ntp-Authentication-Bypass.html, http://packetstormsecurity.com/files/134137/Slackware-Security-Advisory-ntp-Updates.html, http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151021-ntp, http://www.securityfocus.com/archive/1/536737/100/0/threaded, http://www.securityfocus.com/archive/1/536760/100/0/threaded, http://www.securityfocus.com/archive/1/536796/100/0/threaded, http://www.securityfocus.com/archive/1/536833/100/0/threaded, http://www.securityfocus.com/archive/1/archive/1/536737/100/100/threaded, http://www.securityfocus.com/archive/1/archive/1/536760/100/100/threaded, http://www.securityfocus.com/archive/1/archive/1/536796/100/100/threaded, http://www.securityfocus.com/archive/1/archive/1/536833/100/100/threaded, http://www.talosintel.com/vulnerability-reports/, https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf

    Affected packages

    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