CVE-2015-1799

Updated ntp packages fix security vulnerabilities:

The symmetric-key feature in the receive function in ntp_proto.c in ntpd in NTP before 4.2.8p2 requires a correct MAC only if the MAC field has a nonzero length, which makes it easier for man-in-the-middle attackers to spoof packets by omitting the MAC (CVE-2015-1798).

The symmetric-key feature in the receive function in ntp_proto.c in ntpd in NTP before 4.2.8p2 performs state-variable updates upon receiving certain invalid packets, which makes it easier for man-in-the-middle attackers to cause a denial of service (synchronization loss) by spoofing the source IP address of a peer (CVE-2015-1799).

These are all security issues fixed in the ntp-4.2.8p9-1.1 package on the GA media of openSUSE Tumbleweed.

This update for ntp provides the following fixes:

* Respect NTPD_FORCE_SYNC_ON_STARTUP also for dynamic peers.
  (bnc#887957)
* Fix orphan mode. (bnc#883859)

The NTP time service could have been used for remote denial of service amplification attacks.

This issue can be fixed by the administrator as we described in our security advisory SUSE-SA:2014:001

http://lists.opensuse.org/opensuse-security-announce/2014-01/msg00005.html http://lists.opensuse.org/opensuse-security-announce/2014-01/msg00005.html

and on

http://support.novell.com/security/cve/CVE-2013-5211.html http://support.novell.com/security/cve/CVE-2013-5211.html

this update now also replaces the default ntp.conf template to fix this problem.

Please note that if you have touched or modified ntp.conf yourself, it will not be automatically fixed, you need to merge the changes manually as described.

Additionally the following bug has been fixed:

* ntp start script does not update /var/lib/ntp/etc/localtime file if
  /etc/localtime is symlink (bnc#838458)

Security Issues:

* CVE-2013-5211
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-5211>

ntp was updated to fix two security related flaws as well as 'slew' mode handling for leap seconds.

The following vulnerabilities were fixe:

• ntpd could accept unauthenticated packets with symmetric key crypto. (CVE-2015-1798)
• ntpd authentication did not protect symmetric associations against DoS attacks (CVE-2015-1799)
• ntp-keygen may generate non-random symmetric keys on big-endian systems (bsc#928321, CVE-2015-3405).

The following non-security issues were fixed:

• Fix slew mode for leap seconds (bnc#918342).

This update for ntp provides the following fixes:

* Respect NTPD_FORCE_SYNC_ON_STARTUP also for dynamic peers.
  (bnc#887957)
* Fix orphan mode. (bnc#883859)

The symmetric-key feature in the receive function in ntp_proto.c in ntpd in NTP 3.x and 4.x before 4.2.8p2 performs state-variable updates upon receiving certain invalid packets, which makes it easier for man-in-the-middle attackers to cause a denial of service (synchronization loss) by spoofing the source IP address of a peer.

Miroslav Lichvar discovered that NTP incorrectly validated MAC fields. A remote attacker could possibly use this issue to bypass authentication and spoof packets. (CVE-2015-1798)

Miroslav Lichvar discovered that NTP incorrectly handled certain invalid packets. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2015-1799)

Juergen Perlinger discovered that NTP incorrectly generated MD5 keys on big-endian platforms. This issue could either cause ntp-keygen to hang, or could result in non-random keys. (CVE number pending)