7.1 - DSA-3629

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.