DSA-3388-1

CVE-2015-5194 CVE-2015-5195 CVE-2015-5219 CVE-2015-5300 CVE-2015-7691 CVE-2015-7692 CVE-2015-7701 CVE-2015-7702 CVE-2015-7703 CVE-2015-7704 CVE-2015-7850 CVE-2015-7852 CVE-2015-7855 CVE-2015-7871

Several vulnerabilities were discovered in the Network Time Protocol daemon and utility programs:

CVE-2015-5146

A flaw was found in the way ntpd processed certain remote configuration packets. An attacker could use a specially crafted package to cause ntpd to crash if:

• ntpd enabled remote configuration
• The attacker had the knowledge of the configuration password
• The attacker had access to a computer entrusted to perform remote configuration

Note that remote configuration is disabled by default in NTP.

CVE-2015-5194

It was found that ntpd could crash due to an uninitialized
variable when processing malformed logconfig configuration
commands.

CVE-2015-5195

It was found that ntpd exits with a segmentation fault when a
statistics type that was not enabled during compilation (e.g.
timingstats) is referenced by the statistics or filegen
configuration command

CVE-2015-5219

It was discovered that sntp program would hang in an infinite loop
when a crafted NTP packet was received, related to the conversion
of the precision value in the packet to double.

CVE-2015-5300

It was found that ntpd did not correctly implement the -g option:

Normally, ntpd exits with a message to the system log if the offset
exceeds the panic threshold, which is 1000 s by default. This
option allows the time to be set to any value without restriction;
however, this can happen only once. If the threshold is exceeded
after that, ntpd will exit with a message to the system log. This
option can be used with the -q and -x options.

ntpd could actually step the clock multiple times by more than the
panic threshold if its clock discipline doesn't...