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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.1346
                       USN-4563-2: NTP vulnerability
                               21 April 2021

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           NTP
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-8936 CVE-2018-7182 

Reference:         ESB-2021.1255
                   ESB-2020.3427

Original Bulletin: 
   https://ubuntu.com/security/notices/USN-4563-2

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USN-4563-2: NTP vulnerability
20 April 2021

NTP could be made to crash.
Releases

  o Ubuntu 20.10
  o Ubuntu 20.04 LTS

Packages

  o 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

  o ntp - 1:4.2.8p12+dfsg-3ubuntu4.20.10.1
  o sntp - 1:4.2.8p12+dfsg-3ubuntu4.20.10.1
  o ntpdate - 1:4.2.8p12+dfsg-3ubuntu4.20.10.1

Ubuntu 20.04

  o ntp - 1:4.2.8p12+dfsg-3ubuntu4.20.04.1
  o sntp - 1:4.2.8p12+dfsg-3ubuntu4.20.04.1
  o ntpdate - 1:4.2.8p12+dfsg-3ubuntu4.20.04.1

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

References

  o CVE-2019-8936

Related notices

  o USN-4563-1 : ntp, ntpdate, sntp

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