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[SECURITY] [DLA 559-1] ntp security update

Package        : ntp
Version        : 1:4.2.6.p5+dfsg-2+deb7u7
CVE ID         : CVE-2015-7974 CVE-2015-7977 CVE-2015-7978 CVE-2015-7979 
                 CVE-2015-8138 CVE-2015-8158 CVE-2016-1547 CVE-2016-1548
                 CVE-2016-1550 CVE-2016-2516 CVE-2016-2518

Several vulnerabilities were discovered in the Network Time Protocol
daemon and utility programs:


    Matt Street discovered that insufficient key validation allows
    impersonation attacks between authenticated peers.

CVE-2015-7977 / CVE-2015-7978

    Stephen Gray discovered that a NULL pointer dereference and a
    buffer overflow in the handling of "ntpdc reslist" commands may
    result in denial of service.


    Aanchal Malhotra discovered that if NTP is configured for broadcast
    mode, an attacker can send malformed authentication packets which
    break associations with the server for other broadcast clients.


    Matthew van Gundy and Jonathan Gardner discovered that missing
    validation of origin timestamps in ntpd clients may result in denial
    of service.


    Jonathan Gardner discovered that missing input sanitising in ntpq
    may result in denial of service.


    Stephen Gray and Matthew van Gundy discovered that incorrect handling
    of crypto NAK packets my result in denial of service.


    Jonathan Gardner and Miroslav Lichvar discovered that ntpd clients
    could be forced to change from basic client/server mode to interleaved
    symmetric mode, preventing time synchronisation.


    Matthew van Gundy, Stephen Gray and Loganaden Velvindron discovered
    that timing leaks in the the packet authentication code could result
    in recovery of a message digest.


    Yihan Lian discovered that duplicate IPs on "unconfig" directives will
    trigger an assert.


    Yihan Lian discovered that an OOB memory access could potentially
    crash ntpd.

For Debian 7 "Wheezy", these problems have been fixed in version

We recommend that you upgrade your ntp packages.

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS

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