Synopsis
The remote Debian host is missing a security update.
Description
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.
NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
Solution
Upgrade the affected ntp, ntp-doc, and ntpdate packages.