CVE-2021-3677 Information disclosure in postgresql

Medium 6.5 Published 2 Mar 2022 Updated 3 Aug 2024

An authenticated database user can read arbitrary server memory bytes via a crafted query, exposing sensitive data.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2021-3677?

CVE-2021-3677 is a medium-severity vulnerability in Fedoraproject Fedora, published on 2 Mar 2022. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A flaw was found in postgresql. A purpose-crafted query can read arbitrary bytes of server memory. In the default configuration, any authenticated database user can complete this attack at will. The attack does not require the ability to create objects. If server settings include max_worker_processes=0, the known versions of this attack are infeasible. However, undiscovered variants of the attack may be independent of that setting.

Weakness: CWE-200

Which versions are affected by CVE-2021-3677?

1 open source package ship an affected version, including postgresql. It affects 7 products.

Package	Affected	Fixed in
`postgresql` Bitnami	From `11.0.0`	`11.13.0, 12.8.0, 13.4.0`

Linux distribution packages (18)

`rhvm-appliance` Red Hat:rhev_hypervisor:4.4::el8	All versions	`2:4.5-20220603.1.el8ev`
`postgresql12` SUSE:Linux Enterprise Module for Basesystem 15 SP2	All versions	`12.8-8.23.2`
`postgresql13` SUSE:Linux Enterprise Module for Basesystem 15 SP2	All versions	`13.4-5.16.2`
`postgresql13` SUSE:Linux Enterprise Module for Basesystem 15 SP3	All versions	`13.4-5.16.2`
`postgresql12` SUSE:Linux Enterprise Module for Legacy 15 SP3	All versions	`12.8-8.23.2`
`postgresql13` SUSE:Linux Enterprise Module for Package Hub 15 SP2	All versions	`13.4-5.16.2`
`postgresql13` SUSE:Linux Enterprise Module for Package Hub 15 SP3	All versions	`13.4-5.16.2`
`postgresql12` SUSE:Linux Enterprise Module for Server Applications 15 SP2	All versions	`12.8-8.23.2`
`postgresql13` SUSE:Linux Enterprise Module for Server Applications 15 SP2	All versions	`13.4-5.16.2`
`postgresql13` SUSE:Linux Enterprise Module for Server Applications 15 SP3	All versions	`13.4-5.16.2`
`postgresql12` SUSE:Linux Enterprise Server 12 SP5	All versions	`12.8-3.18.2`
`postgresql13` SUSE:Linux Enterprise Server 12 SP5	All versions	`13.4-3.12.2`
`postgresql12` SUSE:Linux Enterprise Server for SAP Applications 12 SP5	All versions	`12.8-3.18.2`
`postgresql13` SUSE:Linux Enterprise Server for SAP Applications 12 SP5	All versions	`13.4-3.12.2`
`postgresql12` SUSE:Linux Enterprise Software Development Kit 12 SP5	All versions	`12.8-3.18.2`
`postgresql13` SUSE:Linux Enterprise Software Development Kit 12 SP5	All versions	`13.4-3.12.2`
`postgresql12` openSUSE:Leap 15.3	All versions	`12.8-8.23.2`
`postgresql13` openSUSE:Leap 15.3	All versions	`13.4-5.16.2`

Products include Fedoraproject Fedora, Postgresql Postgresql, Redhat Enterprise Linux, Redhat Enterprise Linux for Ibm Z Systems, Redhat Enterprise Linux for Power Little Endian, Redhat Software Collections and 1 more.

How do I fix CVE-2021-3677?

Upgrade postgresql to a fixed version for your release line: 11.13.0, 12.8.0 or 13.4.0.

Is CVE-2021-3677 being exploited?

There is no known exploitation of CVE-2021-3677 in the wild and no public exploit code.

All Fedoraproject Fedora vulnerabilities

Sources

Also known as ALPINE-CVE-2021-3677, AZL-8902, BIT-postgresql-2021-3677, CLEANSTART-2026-SE93018, DEBIAN-CVE-2021-3677, ECHO-31f9-f40e-d8e6 and 11 more.