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Ubuntu Security Notice USN-7688-1
August 07, 2025

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

- Ubuntu 16.04 LTS
- Ubuntu 14.04 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. (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. (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 16.04 LTS
  cifs-utils                      2:6.4-1ubuntu1.1+esm1
                                  Available with Ubuntu Pro

Ubuntu 14.04 LTS
  cifs-utils                      2:6.0-1ubuntu2+esm1
                                  Available with Ubuntu Pro

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

References:
  https://ubuntu.com/security/notices/USN-7688-1
  CVE-2020-14342, CVE-2021-20208, CVE-2022-27239, CVE-2022-29869