A cifs-utils security update has been released for Ubuntu 18.04 LTS, 20.04 LTS, 21.10, and 22.04 LTS.

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Ubuntu Security Notice USN-5459-1
June 02, 2022

cifs-utils vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 22.04 LTS
- Ubuntu 21.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in cifs-utils.

Software Description:
- cifs-utils: Common Internet File System utilities

Details:

Aurélien Aptel discovered that cifs-utils invoked a shell when requesting a
password. In certain environments, a local attacker could possibly use this
issue to escalate privileges. This issue only affected Ubuntu 18.04 LTS and
Ubuntu 20.04 LTS. (CVE-2020-14342)

It was discovered that cifs-utils incorrectly used host credentials when
mounting a krb5 CIFS file system from within a container. An attacker
inside a container could possibly use this issue to obtain access to
sensitive information. This issue only affected Ubuntu 18.04 LTS and Ubuntu
20.04 LTS. (CVE-2021-20208)

It was discovered that cifs-utils incorrectly handled certain command-line
arguments. A local attacker could possibly use this issue to obtain root
privileges. (CVE-2022-27239)

It was discovered that cifs-utils incorrectly handled verbose logging. A
local attacker could possibly use this issue to obtain sensitive
information. (CVE-2022-29869)

Update instructions:

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

Ubuntu 22.04 LTS:
cifs-utils 2:6.14-1ubuntu0.1

Ubuntu 21.10:
cifs-utils 2:6.11-3.1ubuntu0.1

Ubuntu 20.04 LTS:
cifs-utils 2:6.9-1ubuntu0.2

Ubuntu 18.04 LTS:
cifs-utils 2:6.8-1ubuntu1.2

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

References:
  https://ubuntu.com/security/notices/USN-5459-1
CVE-2020-14342, CVE-2021-20208, CVE-2022-27239, CVE-2022-29869

Package Information:
  https://launchpad.net/ubuntu/+source/cifs-utils/2:6.14-1ubuntu0.1
  https://launchpad.net/ubuntu/+source/cifs-utils/2:6.11-3.1ubuntu0.1
  https://launchpad.net/ubuntu/+source/cifs-utils/2:6.9-1ubuntu0.2
  https://launchpad.net/ubuntu/+source/cifs-utils/2:6.8-1ubuntu1.2