ntp: Denial of Service -- Remote/Unauthenticated

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.3427
                       USN-4563-1: NTP vulnerability
                              2 October 2020

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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  

Reference:         ESB-2019.3186
                   ESB-2019.1040.2
                   ESB-2019.1019
                   ESB-2019.0744

Original Bulletin: 
   https://usn.ubuntu.com/4563-1/

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USN-4563-1: NTP vulnerability
01 October 2020

NTP could be made to crash.
Releases

  o Ubuntu 18.04 LTS

Packages

  o ntp - Network Time Protocol daemon and utility programs

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 18.04

  o ntp - 1:4.2.8p10+dfsg-5ubuntu7.3
  o ntpdate - 1:4.2.8p10+dfsg-5ubuntu7.3
  o sntp - 1:4.2.8p10+dfsg-5ubuntu7.3

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

References

  o CVE-2019-8936

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