From: [email protected]

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- ------------------------------------------------------------------------- Debian Security Advisory DSA-3629-1 [email protected] https://www.debian.org/security/ Moritz Muehlenhoff
July 25, 2016 https://www.debian.org/security/faq
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Package : ntp
CVE ID : CVE-2015-7974 CVE-2015-7977 CVE-2015-7978 CVE-2015-7979
CVE-2015-8138 CVE-2015-8158 CVE-2016-1547 CVE-2016-1548
CVE-2016-1550 CVE-2016-2516 CVE-2016-2518

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.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: [email protected]
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