[ASA-202106-15] postgresql: multiple issues

[Jonas Witschel]

Arch Linux Security Advisory ASA-202106-15
==========================================

Severity: Medium
Date    : 2021-06-01
CVE-ID  : CVE-2021-32027 CVE-2021-32028 CVE-2021-32029
Package : postgresql
Type    : multiple issues
Remote  : Yes
Link    : https://security.archlinux.org/AVG-1956

Summary
=======

The package postgresql before version 13.3-1 is vulnerable to multiple
issues including arbitrary code execution and information disclosure.

Resolution
==========

Upgrade to 13.3-1.

# pacman -Syu "postgresql>=13.3-1"

The problems have been fixed upstream in version 13.3.

Workaround
==========

None.

Description
===========

- CVE-2021-32027 (arbitrary code execution)

A security issue was found in PostgreSQL before version 13.3. While
modifying certain SQL array values, missing bounds checks let
authenticated database users write arbitrary bytes to a wide area of
server memory.

- CVE-2021-32028 (information disclosure)

A security issue was found in PostgreSQL before version 13.3. Using an
INSERT ... ON CONFLICT ... DO UPDATE command on a purpose-crafted
table, an attacker can read arbitrary bytes of server memory. In the
default configuration, any authenticated database user can create
prerequisite objects and complete this attack at will. A user lacking
the CREATE and TEMPORARY privileges on all databases and the CREATE
privilege on all schemas cannot use this attack at will.

- CVE-2021-32029 (information disclosure)

A security issue was found in PostgreSQL before version 13.3. Using an
UPDATE ... RETURNING on a purpose-crafted partitioned table, an
attacker can read arbitrary bytes of server memory. In the default
configuration, any authenticated database user can create prerequisite
objects and complete this attack at will. A user lacking the CREATE and
TEMPORARY privileges on all databases and the CREATE privilege on all
schemas typically cannot use this attack at will.

Impact
======

An authenticated remote attacker could read the database server memory
or execute arbitrary code on the server.

References
==========

https://www.postgresql.org/support/security/CVE-2021-32027/
https://git.postgresql.org/gitweb/?p=postgresql.git;a=commitdiff;h=467395bfdf33f1ccf67ca388ffdcc927271544cb
https://www.postgresql.org/support/security/CVE-2021-32028/
https://git.postgresql.org/gitweb/?p=postgresql.git;a=commitdiff;h=4a8656a7ee0c155b0249376af58eb3fc3a90415f
https://www.postgresql.org/support/security/CVE-2021-32029/
https://git.postgresql.org/gitweb/?p=postgresql.git;a=commitdiff;h=a71cfc56bf6013e3ea1d673acaf73fe7ebbd6bf3
https://security.archlinux.org/CVE-2021-32027
https://security.archlinux.org/CVE-2021-32028
https://security.archlinux.org/CVE-2021-32029
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