| Description: | Summary:
The remote host is missing an update for the Debian 'ntp' package(s) announced via the DLA-559-1 advisory.
Vulnerability Insight:
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 Debian 7 Wheezy, these problems have been fixed in version 1:4.2.6.p5+dfsg-2+deb7u7.
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: [link moved to references]
Affected Software/OS:
'ntp' package(s) on Debian 7.
Solution:
Please install the updated package(s).
CVSS Score:
7.1
CVSS Vector:
AV:N/AC:M/Au:N/C:N/I:N/A:C
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