Debian Security Advisory DSA 3629-1 (ntp - security update)

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.

ntp on Debian Linux

This check tests the installed software version using the apt package manager.

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.