Ubuntu 20.04 LTS: USN-4454-1 Moderate: Samba Network Crash

ubuntu

August 10, 2020

Samba could be made to crash if it received specially crafted network traffic.

Summary

Samba could be made to crash if it received specially crafted network

traffic.

Software Description:

- samba: SMB/CIFS file, print, and login server for Unix

Details:

Martin von Wittich and Wilko Meyer discovered that Samba incorrectly

handled certain empty UDP packets when being used as a AD DC NBT server. A

remote attacker could possibly use this issue to cause Samba to crash,

resulting in a denial of service.

Topics Covered

security advisory denial of service samba ubuntu crash network issue

Update Instructions

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

Ubuntu 20.04 LTS:
  samba                           2:4.11.6+dfsg-0ubuntu1.4

Ubuntu 18.04 LTS:
  samba                           2:4.7.6+dfsg~ubuntu-0ubuntu2.18

Ubuntu 16.04 LTS:
  samba                           2:4.3.11+dfsg-0ubuntu0.16.04.29

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