Ubuntu Security Notice USN-2567-1
13th April, 2015
ntp vulnerabilities
A security issue affects these releases of Ubuntu and its
derivatives:
- Ubuntu 14.10
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS
Summary
Several security issues were fixed in NTP.
Software description
- ntp
– Network Time Protocol daemon and utility programs
Details
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)
Update instructions
The problem can be corrected by updating your system to the following
package version:
- Ubuntu 14.10:
-
ntp
1:4.2.6.p5+dfsg-3ubuntu2.14.10.3
- Ubuntu 14.04 LTS:
-
ntp
1:4.2.6.p5+dfsg-3ubuntu2.14.04.3
- Ubuntu 12.04 LTS:
-
ntp
1:4.2.6.p3+dfsg-1ubuntu3.4
To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system update will make all the necessary changes.