ntp vulnerabilities

13 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 versions:

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.

References

• CVE-2015-1798
• CVE-2015-1799