Debian Security Advisory
DSA-3108-1 ntp -- security update
- Date Reported:
- 20 Dec 2014
- Affected Packages:
- Security database references:
- In the Debian bugtracking system: Bug 773576.
In Mitre's CVE dictionary: CVE-2014-9293, CVE-2014-9294, CVE-2014-9295, CVE-2014-9296.
- More information:
Several vulnerabilities were discovered in the ntp package, an implementation of the Network Time Protocol.
ntpd generated a weak key for its internal use, with full administrative privileges. Attackers could use this key to reconfigure ntpd (or to exploit other vulnerabilities).
The ntp-keygen utility generated weak MD5 keys with insufficient entropy.
ntpd had several buffer overflows (both on the stack and in the data section), allowing remote authenticated attackers to crash ntpd or potentially execute arbitrary code.
The general packet processing function in ntpd did not handle an error case correctly.
The default ntpd configuration in Debian restricts access to localhost (and possible the adjacent network in case of IPv6).
Keys explicitly generated by "ntp-keygen -M" should be regenerated.
For the stable distribution (wheezy), these problems have been fixed in version 1:4.2.6.p5+dfsg-2+deb7u1.
We recommend that you upgrade your ntp packages.