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Ubuntu Security Notice USN-4563-2

Ubuntu Security Notice USN-4563-2
Posted Apr 20, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4563-2 - USN-4563-1 fixed a vulnerability in NTP. This update provides the corresponding update for Ubuntu 20.04 LTS and Ubuntu 20.10. 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. Various other issues were also addressed.

tags | advisory, denial of service
systems | linux, ubuntu
advisories | CVE-2019-8936
SHA-256 | ef6673d3e576a3567906a1a9483b4e96e99f9e148da6768d28a1344aae2f13f7

Ubuntu Security Notice USN-4563-2

Change Mirror Download
==========================================================================
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:
https://ubuntu.com/security/notices/USN-4563-2
https://ubuntu.com/security/notices/USN-4563-1
CVE-2019-8936

Package Information:
https://launchpad.net/ubuntu/+source/ntp/1:4.2.8p12+dfsg-3ubuntu4.20.10.1
https://launchpad.net/ubuntu/+source/ntp/1:4.2.8p12+dfsg-3ubuntu4.20.04.1

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