| Beschreibung: | Summary:
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-2015-7977CVE-2015-7978Stephen 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 may 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 packet authentication code could result
in recovery of a message digest.
CVE-2016-2516Yihan 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.
Affected Software/OS:
ntp on Debian Linux
Solution:
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.
CVSS Score:
7.1
CVSS Vector:
AV:N/AC:M/Au:N/C:N/I:N/A:C
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