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Debian Security Advisory DSA-3629-1                   security@debian.org
https://www.debian.org/security/                       Moritz Muehlenhoff
July 25, 2016                         https://www.debian.org/security/faq
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Package        : ntp
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:

CVE-2015-7974

    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.

CVE-2015-7979

    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.

CVE-2015-8138

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

CVE-2015-8158

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

CVE-2016-1547

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

CVE-2016-1548

    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.

CVE-2016-1550

    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.

CVE-2016-2516

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

CVE-2016-2518

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

For the stable distribution (jessie), these problems have been fixed in
version 1:4.2.6.p5+dfsg-7+deb8u2.

For the testing distribution (stretch), these problems have been fixed
in version 1:4.2.8p7+dfsg-1.

For the unstable distribution (sid), these problems have been fixed in
version 1:4.2.8p7+dfsg-1.

We recommend that you upgrade your ntp packages.

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

Mailing list: debian-security-announce@lists.debian.org