SynopsisThe remote Debian host is missing a security update.
DescriptionSeveral 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 oldstable distribution (squeeze), these problems have been fixed in version 4.2.6.p2+dfsg-1+deb6u1.
We recommend that you upgrade your heirloom-mailx packages.
Thanks to the Florian Weimer for the Red Hat security update.
NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
SolutionUpgrade the affected ntp, ntp-doc, and ntpdate packages.