CVE-2009-3563

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    CVE-2009-3563

    Published: 9 Dec 2009Last Modified: 10 Apr 2026

    Summary:

    Details: ntp_request.c in ntpd in NTP before 4.2.4p8, and 4.2.5, allows remote attackers to cause a denial of service (CPU and bandwidth consumption) by using MODE_PRIVATE to send a spoofed (1) request or (2) response packet that triggers a continuous exchange of MODE_PRIVATE error responses between two NTP daemons.

    References: ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2010-005.txt.asc, http://aix.software.ibm.com/aix/efixes/security/xntpd_advisory.asc, http://secunia.com/advisories/37629, http://secunia.com/advisories/37922, http://secunia.com/advisories/38764, http://secunia.com/advisories/38794, http://secunia.com/advisories/38832, http://secunia.com/advisories/38834, http://secunia.com/advisories/39593, http://www.vupen.com/english/advisories/2010/0510, http://www.vupen.com/english/advisories/2010/0528, http://www.vupen.com/english/advisories/2010/0993, https://rhn.redhat.com/errata/RHSA-2009-1648.html, https://rhn.redhat.com/errata/RHSA-2009-1651.html, https://rhn.redhat.com/errata/RHSA-2010-0095.html, http://support.ntp.org/bin/view/Main/SecurityNotice#DoS_attack_from_certain_NTP_mode, http://www.debian.org/security/2009/dsa-1948, http://www.kb.cert.org/vuls/id/568372, http://www.securityfocus.com/bid/37255, https://bugzilla.redhat.com/show_bug.cgi?id=531213, http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=560074, http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10673, http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10691, http://lists.vmware.com/pipermail/security-announce/2010/000082.html, http://marc.info/?l=bugtraq&m=130168580504508&w=2, http://marc.info/?l=bugtraq&m=136482797910018&w=2, http://security-tracker.debian.org/tracker/CVE-2009-3563, http://securitytracker.com/id?1023298, http://sunsolve.sun.com/search/document.do?assetkey=1-77-1021781.1-1, http://support.avaya.com/css/P8/documents/100071808, http://www-01.ibm.com/support/docview.wss?uid=isg1IZ68659, http://www-01.ibm.com/support/docview.wss?uid=isg1IZ71047, http://www.kb.cert.org/vuls/id/568372, http://www.kb.cert.org/vuls/id/MAPG-7X7V6J, http://www.kb.cert.org/vuls/id/MAPG-7X7VD7, https://lists.ntp.org/pipermail/announce/2009-December/000086.html, https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11225, https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12141, https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A19376, https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7076, https://support.ntp.org/bugs/show_bug.cgi?id=1331, https://www.kb.cert.org/vuls/id/417980, https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00763.html, https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00809.html

    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