Debian: DSA-3223-1: ntp security update
Summary
CVE-2015-1798
When configured to use a symmetric key with an NTP peer, ntpd would
accept packets without MAC as if they had a valid MAC. This could
allow a remote attacker to bypass the packet authentication and send
malicious packets without having to know the symmetric key.
CVE-2015-1799
When peering with other NTP hosts using authenticated symmetric
association, ntpd would update its internal state variables before
the MAC of the NTP messages was validated. This could allow a remote
attacker to cause a denial of service by impeding synchronization
between NTP peers.
Additionally, it was discovered that generating MD5 keys using ntp-keygen
on big endian machines would either trigger an endless loop, or generate
non-random keys.
For the stable distribution (wheezy), these problems have been fixed in
version 1:4.2.6.p5+dfsg-2+deb7u4.
For the unstable distribution (sid), these problems have been fixed in
version 1:4.2.6.p5+dfsg-7.
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: debian-security-announce@lists.debian.org