[USN-6584-2] Libspf2 vulnerabilities

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==========================================================================
Ubuntu Security Notice USN-6584-2
February 21, 2024

libspf2 vulnerabilities
==========================================================================

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

- Ubuntu 16.04 LTS (Available with Ubuntu Pro)

Summary:

Several security issues were fixed in Libspf2.

Software Description:
- libspf2: Sender Policy Framework for SMTP authorization

Details:

USN-6584-1 fixed several vulnerabilities in Ubuntu 18.04 LTS and
Ubuntu 20.04 LTS. This update provides the corresponding updates for
CVE-2021-33912 and CVE-2021-33913 in Ubuntu 16.04 LTS.

We apologize for the inconvenience.

Original advisory details:

Philipp Jeitner and Haya Shulman discovered that Libspf2 incorrectly handled
certain inputs. If a user or an automated system were tricked into opening a
specially crafted input file, a remote attacker could possibly use this issue
to cause a denial of service or execute arbitrary code. (CVE-2021-20314)

It was discovered that Libspf2 incorrectly handled certain inputs. If a user or
an automated system were tricked into opening a specially crafted input file, a
remote attacker could possibly use this issue to cause a denial of service or
execute arbitrary code. This issue only affected Ubuntu 18.04 LTS and
Ubuntu 20.04 LTS. (CVE-2021-33912, CVE-2021-33913)

Update instructions:

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

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
libmail-spf-xs-perl 1.2.10-6ubuntu0.1~esm2
libspf2-2 1.2.10-6ubuntu0.1~esm2
libspf2-dev 1.2.10-6ubuntu0.1~esm2
spfquery 1.2.10-6ubuntu0.1~esm2

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

References:
https://ubuntu.com/security/notices/USN-6584-2
https://ubuntu.com/security/notices/USN-6584-1
CVE-2021-33912, CVE-2021-33913