USN-4633-1: PostgreSQL vulnerabilities

Releases

• Ubuntu 20.10
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM

Packages

• postgresql-10 - Object-relational SQL database
• postgresql-12 - Object-relational SQL database
• postgresql-9.5 - Object-relational SQL database

Details

Peter Eisentraut discovered that PostgreSQL incorrectly handled connection
security settings. Client applications could possibly be connecting with
certain security parameters dropped, contrary to expectations.
(CVE-2020-25694)

Etienne Stalmans discovered that PostgreSQL incorrectly handled the
security restricted operation sandbox. An authenticated remote attacker
could possibly use this issue to execute arbitrary SQL functions as a
superuser. (CVE-2020-25695)

Nick Cleaton discovered that PostgreSQL incorrectly handled the \gset
meta-command. A remote attacker with a compromised server could possibly
use this issue to execute arbitrary code. (CVE-2020-25696)

Update instructions

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

Ubuntu 20.10

• postgresql-12 - 12.5-0ubuntu0.20.10.1

Ubuntu 20.04

• postgresql-12 - 12.5-0ubuntu0.20.04.1

Ubuntu 18.04

• postgresql-10 - 10.15-0ubuntu0.18.04.1

Ubuntu 16.04

• postgresql-9.5 - 9.5.24-0ubuntu0.16.04.1

This update uses a new upstream release, which includes additional bug
fixes. After a standard system update you need to restart PostgreSQL to
make all the necessary changes.

References

• CVE-2020-25694
• CVE-2020-25695
• CVE-2020-25696