| Description: | Summary:
The remote host is missing an update for the Debian 'ntp' package(s) announced via the DSA-3223-1 advisory.
Vulnerability Insight:
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.
Affected Software/OS:
'ntp' package(s) on Debian 7.
Solution:
Please install the updated package(s).
CVSS Score:
5.0
CVSS Vector:
AV:N/AC:L/Au:N/C:P/I:N/A:N
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