Ubuntu 21.04: 4930-1 Moderate: Samba Unauthorized Access Threat

ubuntu

April 29, 2021

Samba would allow unintended access to files over the network.

Summary

Samba would allow unintended access to files over the network.

Software Description:

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

Details:

Peter Eriksson discovered that Samba incorrectly handled certain negative

idmap cache entries. This issue could result in certain users gaining

unauthorized access to files, contrary to expected behaviour.

Topics Covered

security advisory moderate unauthorized access samba access issue moderate severity ubuntu file sharing network access

Update Instructions

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

Ubuntu 21.04:
  samba                           2:4.13.3+dfsg-1ubuntu2.1

Ubuntu 20.10:
  samba                           2:4.12.5+dfsg-3ubuntu4.3

Ubuntu 20.04 LTS:
  samba                           2:4.11.6+dfsg-0ubuntu1.8

Ubuntu 18.04 LTS:
  samba                           2:4.7.6+dfsg~ubuntu-0ubuntu2.23

Ubuntu 16.04 LTS:
  samba                           2:4.3.11+dfsg-0ubuntu0.16.04.34

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