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A PostgreSQL security update has been released for Ubuntu Linux 18.04 LTS:

[USN-6538-2] PostgreSQL vulnerabilities




[USN-6538-2] PostgreSQL vulnerabilities


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Ubuntu Security Notice USN-6538-2
January 17, 2024

postgresql-10 vulnerabilities
==========================================================================

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

- Ubuntu 18.04 LTS (Available with Ubuntu Pro)

Summary:

Several security issues were fixed in PostgreSQL.

Software Description:
- postgresql-10: Object-relational SQL database

Details:

USN-6538-1 fixed several vulnerabilities in PostgreSQL. This update provides
the corresponding updates for Ubuntu 18.04 LTS.

Original advisory details:

Jingzhou Fu discovered that PostgreSQL incorrectly handled certain unknown
arguments in aggregate function calls. A remote attacker could possibly use
this issue to obtain sensitive information. (CVE-2023-5868)

Pedro Gallegos discovered that PostgreSQL incorrectly handled modifying
certain SQL array values. A remote attacker could use this issue to obtain
sensitive information, or possibly execute arbitrary code. (CVE-2023-5869)

Hemanth Sandrana and Mahendrakar Srinivasarao discovered that PostgreSQL
allowed the pg_signal_backend role to signal certain superuser processes,
contrary to expectations. (CVE-2023-5870)

Update instructions:

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

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
postgresql-10 10.23-0ubuntu0.18.04.2+esm1
postgresql-client-10 10.23-0ubuntu0.18.04.2+esm1

After a standard system update you need to restart PostgreSQL to make all
the necessary changes.

References:
https://ubuntu.com/security/notices/USN-6538-2
https://ubuntu.com/security/notices/USN-6538-1
CVE-2023-5868, CVE-2023-5869, CVE-2023-5870