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Debian Security Advisory DSA-3223-1                   security@debian.org
http://www.debian.org/security/                        Alessandro Ghedini
April 12, 2015                         http://www.debian.org/security/faq
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Package        : ntp
CVE ID         : CVE-2015-1798 CVE-2015-1799
Debian Bug     : 782095

Multiple vulnerabilities were discovered in ntp, an implementation of the
Network Time Protocol:

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
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