[USN-4563-2] NTP vulnerability

========================================================================== Ubuntu Security Notice USN-4563-2 April 20, 2021
ntp vulnerability ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 20.10 – Ubuntu 20.04 LTS
Summary:
NTP could be made to crash.
Software Description: – ntp: Network Time Protocol daemon and utility programs
Details:
USN-4563-1 fixed a vulnerability in NTP. This update provides the corresponding update for Ubuntu 20.04 LTS and Ubuntu 20.10.
Original advisory details:
 It was discovered that the fix for CVE-2018-7182 introduced a NULL pointer  dereference into NTP. An attacker could use this vulnerability to cause a  denial of service (crash).
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.10:   ntp                             1:4.2.8p12+dfsg-3ubuntu4.20.10.1   ntpdate                         1:4.2.8p12+dfsg-3ubuntu4.20.10.1   sntp                            1:4.2.8p12+dfsg-3ubuntu4.20.10.1
Ubuntu 20.04 LTS:   ntp                             1:4.2.8p12+dfsg-3ubuntu4.20.04.1   ntpdate                         1:4.2.8p12+dfsg-3ubuntu4.20.04.1   sntp                            1:4.2.8p12+dfsg-3ubuntu4.20.04.1
In general, a standard system update will make all the necessary changes.
References:   ubuntu.com/security/notices/USN-4563-2   ubuntu.com/security/notices/USN-4563-1   CVE-2019-8936
Package Information:   launchpad.net/ubuntu/+source/ntp/1:4.2.8p12+dfsg-3ubuntu4.20.10.1   launchpad.net/ubuntu/+source/ntp/1:4.2.8p12+dfsg-3ubuntu4.20.04.1