USN-3707-1: NTP vulnerabilities

Releases

• Ubuntu 18.04 ESM
• Ubuntu 17.10
• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM

Packages

• ntp - Network Time Protocol daemon and utility programs

Details

Yihan Lian discovered that NTP incorrectly handled certain malformed mode 6
packets. A remote attacker could possibly use this issue to cause ntpd to
crash, resulting in a denial of service. This issue only affected Ubuntu
17.10 and Ubuntu 18.04 LTS. (CVE-2018-7182)

Michael Macnair discovered that NTP incorrectly handled certain responses.
A remote attacker could possibly use this issue to execute arbitrary code.
(CVE-2018-7183)

Miroslav Lichvar discovered that NTP incorrectly handled certain
zero-origin timestamps. A remote attacker could possibly use this issue to
cause a denial of service. This issue only affected Ubuntu 17.10 and Ubuntu
18.04 LTS. (CVE-2018-7184)

Miroslav Lichvar discovered that NTP incorrectly handled certain
zero-origin timestamps. A remote attacker could possibly use this issue to
cause a denial of service. (CVE-2018-7185)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 18.04

• ntp - 1:4.2.8p10+dfsg-5ubuntu7.1

Ubuntu 17.10

• ntp - 1:4.2.8p10+dfsg-5ubuntu3.3

Ubuntu 16.04

• ntp - 1:4.2.8p4+dfsg-3ubuntu5.9

Ubuntu 14.04

• ntp - 1:4.2.6.p5+dfsg-3ubuntu2.14.04.13

In general, a standard system update will make all the necessary changes.

References

• CVE-2018-7182
• CVE-2018-7183
• CVE-2018-7184
• CVE-2018-7185

Related notices

• USN-3707-2