A Samba security update has been released for Ubuntu Linux 20.04 LTS and 21.10.

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Ubuntu Security Notice USN-5260-1
February 01, 2022

samba vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 21.10
- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in Samba.

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

Details:

Orange Tsai discovered that the Samba vfs_fruit module incorrectly handled
certain memory operations. A remote attacker could use this issue to cause
Samba to crash, resulting in a denial of service, or possibly execute
arbitrary code as root. (CVE-2021-44142)

Michael Hanselmann discovered that Samba incorrectly created directories.
In certain configurations, a remote attacker could possibly create a
directory on the server outside of the shared directory. (CVE-2021-43566)

Kees van Vloten discovered that Samba incorrectly handled certain aliased
SPN checks. A remote attacker could possibly use this issue to impersonate
services. (CVE-2022-0336)

Update instructions:

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

Ubuntu 21.10:
samba 2:4.13.17~dfsg-0ubuntu0.21.10.1

Ubuntu 20.04 LTS:
samba 2:4.13.17~dfsg-0ubuntu0.21.04.1

This update uses a new upstream release, which includes additional bug
fixes. In general, a standard system update will make all the necessary
changes.

References:
  https://ubuntu.com/security/notices/USN-5260-1
CVE-2021-43566, CVE-2021-44142, CVE-2022-0336

Package Information:
  https://launchpad.net/ubuntu/+source/samba/2:4.13.17~dfsg-0ubuntu0.21.10.1
  https://launchpad.net/ubuntu/+source/samba/2:4.13.17~dfsg-0ubuntu0.21.04.1